ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] We have already shown1 that the operculum is by no means uniform in structure or development throughout the genus. There is a large group of species in which the perianth whorls are separate from each other and form two opercula which fit one over the other. Both caps are deciduous, the inner one ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/219513b0