ALBERT

Description: Little attention has been paid till now to the algae, transported to the Netherlands coast on drifting objects. About a century ago T. D. Vrijdag Zijnen and G. Bisschop (near Scheveningen, ± 1845), and L. H. Buse (between Wijk aan Zee and Zandvoort, ± 1840—1847) were the first to pay attention to this subject. The material collected, especially that by the first two investigators, is mentioned in the Prodromus Fl. Bat. (1853). The book of Van Goor (1923) contains a chapter on these algae, in which, however, only few new observations occur. The author is much indebted to Dr Josephine Th. Koster for her kind help, as well as to Dr S. J. v. Ooststroom. The material, collected by Vrijdag Zijnen, Bisschop and Buse is almost completely present in the collections of the ‘Rijksherbarium’ and the ‘Koninklijke Ncderlandse Botanische Vereniging’, Leiden. The material, collected during the last few years has for the greater part been brought together by the present author, and furthermore especially by K. Swennen (Den Helder), J. Stock (Amsterdam), A. Mulder (Haarlem) and P. Leenhouts (Scheveningen). This material belongs to the collection of the Rijksherbarium, Leiden, but most of it is, for the time being, put under the charge of the “Comité ter Bestudering van de Nederlandse Mariene Flora en Fauna” (“Committee on the Netherlands’ Marine Flora and Fauna”) and temporarily preserved in “Het Filiaal”, Leiden.

Description: Little attention has been paid till now to the algae, transported to the Netherlands coast on drifting objects. About a century ago T. D. Vrijdag Zijnen and G. Bisschop (near Scheveningen, \xc2\xb1 1845), and L. H. Buse (between Wijk aan Zee and Zandvoort, \xc2\xb1 1840\xe2\x80\x941847) were the first to pay attention to this subject. The material collected, especially that by the first two investigators, is mentioned in the Prodromus Fl. Bat. (1853). The book of Van Goor (1923) contains a chapter on these algae, in which, however, only few new observations occur. The author is much indebted to Dr Josephine Th. Koster for her kind help, as well as to Dr S. J. v. Ooststroom. The material, collected by Vrijdag Zijnen, Bisschop and Buse is almost completely present in the collections of the \xe2\x80\x98Rijksherbarium\xe2\x80\x99 and the \xe2\x80\x98Koninklijke Ncderlandse Botanische Vereniging\xe2\x80\x99, Leiden. The material, collected during the last few years has for the greater part been brought together by the present author, and furthermore especially by K. Swennen (Den Helder), J. Stock (Amsterdam), A. Mulder (Haarlem) and P. Leenhouts (Scheveningen). This material belongs to the collection of the Rijksherbarium, Leiden, but most of it is, for the time being, put under the charge of the \xe2\x80\x9cComit\xc3\xa9 ter Bestudering van de Nederlandse Mariene Flora en Fauna\xe2\x80\x9d (\xe2\x80\x9cCommittee on the Netherlands\xe2\x80\x99 Marine Flora and Fauna\xe2\x80\x9d) and temporarily preserved in \xe2\x80\x9cHet Filiaal\xe2\x80\x9d, Leiden.

Description: Spilomyia boschmai nov. spec.\nFemale. \xe2\x80\x94 Length about 16 mm. The eyes are bare, brown, with a dark marginal area and a dark longitudinal band just behind the middle; furthermore a number of dark specks is present, especially in the anterior half. The face is bright yellow, without a dark median line; it is covered as far as the bases of the antennae with rather long, erect, yellow hairs. The frons is yellow with a black median stripe extending from the black vertex to the implantation of the antennae on the antennal tubercle; in the paratype, however, the base of the antennal tubercle is yellow, interrupted in the middle with black. The pubescence of the frons is shorter than that of the face and is of a black colour. The black median stripe broadens ventrally; over its entire length the breadth is about \xe2\x85\x93 of the total breadth of the frons. The vertex is covered with longish black hairs which have the upper half curved forwards. The ocelli are brown and are arranged in an equilateral triangle.\nThe occiput is dusty gray and bears a row of short black bristles, behind which there is a row of longer black hairs. The antennae are brown; the third segment being slightly darker dorsally, it is rounded and about as long as the second segment. The arista is pale brown, it is longer than the antenna.\nThe thorax is dull black with the usual colour-pattern. The yellow longitudinal lines are about parallel, their tops, which are somewhat narrowed, are slightly converging; the two posterior lines are fused to a crescentshaped spot. The pubescence is short, largely black and about erect; at the yellow areas the hairs are yellow. The pleura are black, somewhat shining, with 5 yellow spots; the pubescence is of a predominantly pale colour. The last yellow spot is much larger than the second last. The pteropleuron shows

Description: In most Dutch scientific and popular books dealing with Polychaeta, the common amphictenid of the Dutch North Sea shore is indicated with the name Pectinaria belgica (Pallas, 1766). In preparing a revision of the Dutch Polychaeta, one of us (J. A. W. L.) studied the extensive collections of Dutch representatives of the family Amphictenidae present in the Rijksmuseum van Natuurlijke Historie at Leiden and the Zoological Museum at Amsterdam, as well as newly collected material from the Dutch beaches. Comparing these specimens with the account by Fauvel (1927:218225) of the Amphictenidae in the Faune de France, all of the Dutch specimens (with the single exception of a specimen of Pectinaria (Amphictene) auricoma collected in the former Zuiderzee) proved to be identical with what Fauvel named Pectinaria (Lagis) koreni (Malmgren), and not with his Pectinaria belgica (Pallas). A closer study of the status of both the generic and specific name of the Dutch species lead to rather unexpected results.\n\nGENERIC NAMES\nThe name Pectinaria was first published by Lamarck (1818:348). Its type-species is Nereis cylindraria belgica Pallas, 1766, by subsequent selection by Hartman (1959:479).\nAccording to Malmgren (1866:355), the generic name Pectinaria does not date from Lamarck (1818), but from Lamarck (1812). In the latter publication, Lamarck (1812:95,96) divided the "Annelides" into two orders, the second of which, "Annelides Gymnobranches", is again divided into two sections, (1) the "Gymn[obranches] libres ou vagabondes" and (2) the "Gymn[obranches] tubicolaires". In the latter, again, two groups were