| OCR Text |
Show 738 DR. J. E. GRAY O N THE CALYPTRiEiDiE. [June 27, Var. 1. Shell convex, with brown spiral streaks. Var. 2. Shell flat, pure white. 3. CRYPTA PORCELLANA, Adams; Lamk. Shell smooth, often irregular, costate, tubercular, or granulated from the form of the surface of the body to which they are or were attached. Var. 1. Shell convex, coloured, varied with stripes or spots; on the outside of shells or on rocks. Patella porcellana, Linn. Crepidula porcellana, Lamk. Crepidula fomicata, Patella fomicata, Linn. (Chenu, Man. f. 2354?). C. arenata, Brod. C. excavata, Brod. C. aplysioides, Reeve. C. onyx, Sow. C. marginalis, Brod. Var. 2. Shell flat, often concave above, white; living inside of shells or in cavities. C. nivea et G. squama, Brod. C. navicelloides, Nuttall. C. glauca, Say. C. unguiformis, Lamk. C. exuviala, Nuttall (see Chenu, Man. f. 2360, 2362). Surface altered by the body to which it is attached:- Crepidula lirata, Reeve. C. rugosa, Nuttall. Hab. ? In Messrs. Adams's ' Genera of Shells,' the species here united are scattered among the three subgenera Crypta, Crepipatella, and Inacus, the latter being formed from the specimens that happen to take up their abode in the cavities of shells. It was this extraordinary distribution of species so nearly allied as to be regarded as derived from the same brood or set of eggs, that induced me to undertake to make notes on them. More than one species may be combined in these synonyms, which may be distinguished by some difference in the teeth or other organs of the animal, where the animals from different localities have been examined and compared; and if tbe specimens from different localities prove to be distinct, each doubtless will furnish the varieties in shape and surface produced by the form and surface of the body to which they may happen to be attached. 4. CRYPTA SITCHANA. Shell smooth, covered with a paleaceous periostraca ; inner lip flat, arched inwards. Crepidula sitchana, Middend. Hab. Sitcha. |
