| OCR Text |
Show 1867.] DR. J. E. GRAY ON THE CALYPTR/EID^E. 737 3. CREPIPATELLA LINGULATA, Brod. The internal plate with a subcentral radiating fold, forming a notch in the margin of the lip. 4. CREPIPATELLA DORSATA, Brod. The apex rather above the margin. Hab. Vancouver Island. 2. CRYPTA, Humphrey. Crepidula, Lamk. Sandalium, Schum. Shell oblong, elongate. Apex submarginal, subspiral. Internal lamina concave, covering about half the cavity. The lip transverse, nearly straight, or with a slight subcentral notch. Messrs. H. and A. Adams formed the genus Inacus for the white flat specimen of this genus. All the specimens of the different species that take up their residence in the inside of the shell assume this form and colour. It has been suggested that, instead of being dependent on the accident of locality, their living in such places is a habit peculiar to the species, and a proof that they are of a distinct kind. This theory is set at rest by the fact that some specimens of the shell show the two states; that is to say, an animal growing on the outside of a shell has moved to the inside, and an animal that commenced life on the inside of a shell has moved to the outside. In the first case the apex of the shell is convex and brown, and the circumference white and flat; and in the other the apex is flat and white, and the circumference brown and convex. I have seen one specimen in which the animal has moved twice, and the shell has a brown lip and margin and a white flat intermediate space. The change of form, surface, and colour of the shell of this family was described in m y paper, published in the ' Philosophical Transactions' for 1838, and reprinted in Johnston's 'Letters on Conchology;' so there is less excuse for the formation of species, much less genera, on such characters. * Apex lateral, posterior, subspiral. Crepidula. 1. CRYPTA ACULEATA. Crepidula aculeata, Lamk. Patella aculeata, Gmelin. C. echinus, Brod. C. hystrix, Brod. C. californica, Nuttall; Chenu, Man. f. 2355, 2356, 2359. Surface with spiral lines of spines or small scales. Hab. Jamaica; Rio Janeiro ; Honduras ; California; Australia; Sydney ; Kurrachee ; Natal; Japan. 2. CRYPTA COSTATA, Deshayes (Chenu, Man. f. 2353). Shell with broad spiral ribs, sharp-edged above. |
