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Show 186/.] DR. J. E. GRAY ON THE CALYPTRYEIDJE. 739 5. CRYPTA LESSONI. Shell whitish, varied with brown or white ; outer surface with concentric expanded lamina. Crepidula fimbriata, Reeve. C. lessonii, Brod. Hab. Monterey ; Upper California; Vancouver Straits. ** Apex of shell subcentral; portions rather produced, acute. 6. CRYPTA INCURVA. Shell dark brown (rarely white); apex acute, rather produced, subcentral; the outer surface with close, regular, small, spiral or longitudinal ribs. Crepidula incurvata, Brod. Hab. Honduras. Var. 2. ? 7. CRYPTA HEPATICA, Deshayes. Shell dark brown, smooth, with a white ray on each side of the apex ; apex acute, subcentral, produced. Crepidula hepatica, Desh. Hab. ? Messrs. Adams refer the first of these species to the subgenus Crypta, and the second to Crepipatella. 3. GARNOTIA, Gray. Shell conical, cup-shaped ; apex acute, posterior, above the margin ; the internal lamina flat, shelving to the level of the apex, leaving a conical cavity beneath the lip, arched inwards or subtransverse. GARNOTIA ADUNCA, SOW. Shell smooth or subcostate, dark brown, with a small white spot on each side of the lip ; inner lip pale. Crepidula rostrata, C. B. Adams : junior? Hab. Vancouver's Island. Tribe III. Shell oblong, transverse, depressed; apex scarcely raised, posterior, submarginal; nucleus distinct; spiral cavity expanded, shallow, with a transverse plate occupying about two-thirds the width on the left or pillar side of the hinder half of the cavity, and attached by each of the sides to the inside of the shell, and with a radiating fold on the lower surface, forming a radiating thickened rib, ending in a concavity like a muscular scar near the edge ; the front edge on the right side of the fold short, forming a deep notch ; on the left side expanded and rounded, with a notch near the pillar or right edge of the shell. Ergaeina. The fold in the plate is evidently analogous to the fold and |