278 MAZATLAN UNIVALVES 



2 Cr. incurva in situ, one on the other. 1380, 2 sp. with 

 Bryozoa and Serpula. 



Aberrant specimens. Tablet 1381 contains 2 sp. deck thin, as 

 in C. nivea. 1382, 1 sp. verv convex, light coloured. 1383, 

 2 sp. deck variable in length. 1384, 5 sp. margin irregular. 

 1385, 4 do. diseased. 1386, 3. sp. form approaching C. adunca, 

 jun. 1387, 5 do. adult. 



340. CREPIDULA ONYX, Sow. 



C. t. solidiore, plerumque lamellis, ad marginem scepe, extus 

 rare apparentibus, instructed ; epidermide olivaced copiose in- 

 dutd, irregulariter lamellosd, haud nitente ; habitu incrementi 

 plerumque recto, seu incurvato, haud spirali ; planatd, sen in- 

 terdum convexd ; colore kepatico, splendente, interdum nigriore, 

 rare livido-carneo ; vertice nucleoso parvo, l&vi, discoidali, apice 

 celato, prope marginem plerumque centraliter sito, s&pissime ad 

 marginem vecto et detrito ; testa juniore subcorned, castaneo 

 maculatd, haud nigrd ; septo interno solidiore, opaco, albo, 

 striulas incrementi nisi marginem versus haud monstrante, 

 margine plus minusve intus angulato, nee antice nee pottice 

 distincte sinuato. 

 Sow. Gen. Crepidula, f. 2, 

 Crypta onyx, H. fy A. Ad. Gen. \. p. 369. 

 = Crepidula Phepatica, (7. B. Ad. Pan. Shells, p. 227, no. 346. 



(teste sp. typ. in Mus. Cum.) : non Menke in Zeit. f. Mai. 



1847, p. 184, no. 33. 

 ? = Crepidula hepatica, Desk. JEnc. Meth. Vers, 1830, vol. ii. 



p. 26, no. 7 : Lam. An. s. Vert. vol. vii. p. 646, no. 12. 



(Crepipatella h.) H. $ A. Ad. Gen. i. 369. 

 ? = Crepidula hepatica, Krauss Sudafr. Moll. p. 69, no. 3, pi. 4, 



f. 12 a, b.Dkr. Ind. Moll. Guin. p. 34, no. 92, pi. 5, f. 4, 5. 

 = Calyptrsea amygdalus, Val. Voy. Ven. pi. 15, f. 3. 

 Var. ? = Crepidula contorta, Mke. Zeit. f. Mai. 1851, p. 35, 



no. 121, (non Quoy fy Gaim.) 

 Jun. = Crepidula Cerithicola, C. S. Ad. Pan.'Skells, pp. 225,, 



320, no. 343. 

 Comp. Crepidula rugosa, Nutt. in Jays Cat. p. 107, no. 3043, bis.- 



Proc. Zool. Soc. 1856. (Crypta. r.) H. $ A. Ad. Gen. i. 369. 



Whether Deshayes described his C. hepatica from a Pacific or 

 African shell is not known ; and whether the two are identical 

 has not yet been ascertained, the African specimens being 

 generally too much worn for comparison. Krauss' var. com- 



