• 278 MAZATLAN UNIVALVES 



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

 Bryozoa and Serpnla. 



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

 in C. nivea. — 1382, 1 sp. very 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. 



310. Ceepidcla onyx, Sow. 



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

 rare apparentihus, instructa ; epidermide olivacea copiose in- 

 dutd, irregitlanter lamellosa, hand nitente ; Jiahitu incrementi 

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

 terdum convexd ; colore hepatico, splemlente, interdum nigriore, 

 rare livido-carneo ; verfice nucleoso parvo, Icevi, discoidali, apice 

 celato, prope marginem plerumque centraliter site, scepissime ad 

 marginem vecto et detrito ; testa juniore subcorned, castaneo 

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

 striulas incrementi nisi marginem versus haud monstrante, 

 margine plies minusve intus angulato, nee antice nee poitice 

 distincte sinuate. 



Sow. Gen. Crepidula, f. 2, 



Crypta onyx, H. Sf A. Ad. Gen. i. p. 369. 



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



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



1817, p. 181, no. 33. 

 ? = Crepidula hepatica, Desh. JEnc. MetJi. Yevs, 1830, vol. ii. 



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



(Crepipatella h.) H. J,' A. Ad. Gen. i. 369. 

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



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

 = Calypti*a?a amygdalus, Val. Voi/. Ten. pi. 15, f. 3. 

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



no. 121, (non Qxot/ Sf Gaim.) 

 Jun. = Crepidula Cerithicola, C. B. Ad. Pan. Sliclls, pp. 225, 



320, no. 34:3. 

 Comp. Crepidula rugosa,3^«<#. in Jai/s Cat. p. 107, no. 3013, bis.- 



Proc. Zool. Soc. i856.— (Crypta. r.) H. Sf A. Ad. Gen. i. 369. 



AMiether Doshayes 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- 



