ALBERT

Description: A second list of species found near Hellevoetsluis, prov. S. Holland, on heaps of stones used for the Delta-works. See also Gorteria 3 (4), 1966, p. 49\xe2\x80\x9451.

Description: The author mentions a second find of Lactuca tatarica (L.) C. A. Mey. in the harbour of Rotterdam in 1966, in a ruderal locality. The number of specimens increased in 1967.

Description: The area of distribution of most Myriophyllum species is insufficiently known. In this paper, many new localities are recorded for 16 species from SE. Asia, Malesia, Madagascar, and Africa, and a key is added. One species from New Guinea, M. coronatum, is described as new (fig. I). Of the other species the synonymy is complete, but no descriptions are given; of each the distribution and ecology is cited, and if necessary critical remarks are added.\nUnder the new species the second remark deals with the possible desirability of distinguishing subgenera or sections within the genus. It is concluded that, as the species show a reticulate affinity by parallelism, especially as regards reductions in both vegetative and sexual organs, the usefulness of distinguishing infrageneric taxa is debatable and not advisable.

Description: Two adventitious species of the genus Beckmannia Host have been found in the Netherlands. They can be distinguished as follows: 1. Stems mostly tuberously thickened at the base. Spikelets always 2-flowered (fig. 1, a). Glumes always more or less irregularly dentate at the mostly rounded and mostly very shortly acuminate apex, and with often very shortly ciliate margins, hardly swollen when ripe. Ripe stamens mostly distinctly exserted; anthers 1,6\xe2\x80\x942,1 mm long (fig. 1, b) B. eruciformis (L.) Host 1\xe2\x80\x99. Stems not thickened at the base. Spikelets 1-flowered (fig. 1, c); sometimes a few 2-flowered spikelets are present in the spike. Glumes entire at the acute and distinctly acuminate apex, and with glabrous margins, mostly rather strongly swollen when ripe. Ripe stamens mostly but slightly exserted; anthers 0,7\xe2\x80\x941,1 mm long (fig. 1, d) ... B. syzigachne (Steud.) Fern.

Description: Five species of Atriplex s.s. have been found as aliens in the Netherlands. In the following key the indigenous A. laciniata and the species belonging to the A. patula-complex have been included. Of the latter a tentative revision will appear next year. The key is to be used for dried plants with completely mature fruits only.

Description: In May 1938 I had the opportunity to observe seven living Aplysia depilans in the Zoological Station Naples. Notes on the size and colour were made and different methods of preservation were tried.\nAs one often wonders how much of the original colour pattern has been preserved in museum specimens of Aplysia, it seems important to give the result of the comparison of the living specimens as studied in 1938 and the same specimens after 18 years of preservation, in 1956. The best way of preservation appears to be killing in diluted alcohol as specimen nr. V shows.

Description: Cosmopsaltria agatha Moulton is removed from the synonymy of Orientopsaltria montivaga (Distant) and reallocated in Orientopsaltria. The drawings of the male genitalia facilitate the distinction of both species.

Description: A re-examination of the types of Lithobius occultus Silvestri, 1894, and Lithobius excellens Silvestri, 1894, from Italy, has shown that the two are based on specimens of the same species which takes the name of Eupolybothrus (Schizopolybothrus) excellens (Silvestri, 1894), and is probably most closely related to E. tabularum (Verhoeff, 1937). A tentative survey of the subgenera of the genus Eupolybothrus Verhoeff, 1907, is given, and a new subgenus, Leptopolybothrus nov. subgen., type-species Lithobius leptopus Latzel, 1880, is erected.

Description: The myicolid copepod Pseudomyicola spinosus is reported from 22 new hosts (pelecypods) in Bermuda and the West Indies, from 1 new host (a pelecypod) in Madagascar, and from an ascidian (Pyuridae) in Cura\xc3\xa7ao (probably an accidental association). P. spinosus is redescribed, based on specimens from Isognomon alatus in Bermuda. Among 316 P. spinosus from Bermuda, Puerto Rico, Jamaica, Barbados, Brazil, Senegal, Madagascar, and Jugoslavia the dimensions of the body and caudal ramus varied widely. The ornamentation of the anal segment showed four different conditions of spination, and sometimes included an extra long ventral setule on either or both sides.\nThe specimens studied are regarded as one species, P. spinosus, without apparent subspecific differences. The following are considered as synonyms of P. spinosus: P. glaber Pearse, 1947, Myicola tageli Pearse, 1947, P. anomalocardiae Narchi, 1965, and P. mirabilis Humes, 1959.

Description: The following account of the non-marine Mollusca of the Island of Sumatra, the second largest of the Greater Sunda Islands (surface 440.000 km2) is based on the following collections: 1. Zoological Museum, Amsterdam, including the material collected by Prof. Max Weber, Dr. L. P. de Bussy, Jhr. Dr. F. C. van Heurn, Prof. J. C. van der Meer Mohr, Dr. E. Jacobson, and many others. 2. Rijksmuseum van Natuurlijke Historie, Leiden. 3. Museum Zoologicum Bogoriense, Bogor (Java). 4. Naturhistorisches Museum, Basle (Switzerland). 5. Zoologisches Museum, Z\xc3\xbcrich (Switzerland). 6. Mus\xc3\xa9um d\xe2\x80\x99Histoire Naturelle, Geneva (Switzerland). 7. Naturmuseum Senckenberg, Frankfurt am Main (Germany). 8. Mr. J. P. van Niel, who lived in Sumatra from 1951 to 1956 and made great efforts to collect molluscs in his leisure time. This material has been presented to the Zoological Museum, Amsterdam. 9. Various private cabinet owners in the Netherlands and one in Switzerland who received their material from relations overseas.\nIn the list of localities these collections will be referred to by the following symbols: ZMA Zoological Museum, Amsterdam RMNH Rijksmuseum van Natuurlijke Historie, Leiden MBo Museum Zoologicum Bogoriense, Bogor MBa Naturhistorisches Museum, Basel MZh Zoologisches Museum, Z\xc3\xbcrich MGv Museum d\xe2\x80\x99Histoire Naturelle, Geneva SMF Senckenberg Museum, Frankfurt Nl Mr. J. P. van Niel Br Mr. A. C. van Bruggen, Leiden Bt Mr. L. J. M. Butot, Haarlem By Dr. P. Bohny, Basle Dr Mr. J. Drijver, Wageningen Ls Dr. F. E. Loosjes, Wageningen Nb Mr. W. H. Neuteboom, Heemskerk Sl Mr. L. van der Slik, Rotterdam Vm Mr. L. A. W. C. Venmans, Moergestel