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Sea urchin
1. There is no population in which only rostrate or melanistic shells occur, and normal shells are absent.
2. There is locally a gradual passing from normal shells to sub-rostrate and rostrate ones; Cernohorsky estimated (by letter)
the relative frequency of these stages in Mauritia eglantina Duclos in Mondoure Bay as about 30: 5: 1.
3. Rostration and melanism often occur in the same specimen, but they are not always linked.
4. Localities from which such shells are known, may be scattered over the whole region inhabited by the species, but they
evidently are concentrated in certain smaller areas.
5. The tendency to become rostrate or melanistic differs, as certain species seem not to be susceptible at all or at least
less susceptible to rostration and melanism than other species.
There seems to be no predominance of any sex in rostrate cowries; the radula evidently does not differ from that of normal
specimens.
Certain specific names are persistently used in literature, despite their invalidation by the I.C.Z.N. some 10 years ago. As
I was one of the culprits in using two invalid names in my Catalogue of Living Cypraeidae, I thought it advisable to make the
necessary corrections.
By opinion 261 (published 10th August, 1954), the work of L. T. Gronovius, Zoophylacium Gronovianum, 3 parts, 1763 - 1781,
and F. C. Meuschen's Index to Gronovius' work from 1781, have been rejected as non-binominal. This will invalidate the
following names:
Two Belgian scientists, whose hobby is conchology, have done some remarkable shell collecting along the Brazilian Coast of
South America. They are Dr. Bernard "Ben" Tursch, 29 years old graduate in bio-chemistry from the "Ecole Polytechnique"
University te'Libre de Bruxelles, and Dr. Jean Pierret, 32 years old and a graduate anthropologist, also from the University
of Bruselles.
Ben Tursch is working for Stanford University of California in Brazil where he is investigating the chemical structure of
some natural products. In his spare time, he collects shells and has over 300 species of Conus alone. Tursch hopes to publish
a catalogue on Brazilian marine shells with the help of local collectors.
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