280 MAZATtAN tTNIVALVES 



L'pool Col. — [C. ? hepatica : Benguela and Loander, very 

 common and variable, Tarns: Tafel Bay and Natal, Krauss.^ 



Tablet. 1388 contains 3 sp. very young. — 1389, 4 sp. different 

 ages, finely grown. — 1390, 2 sp. form approacbing C. incnrva; 

 one very dark. — 1391, 1 sp. witb irregular ridges, passing to 

 tbe form Lessonii. — 1392, 1 sp. twisted, apex lateral. — 1393, the 

 largest specimen. — 1394, 1 sp. ligbt coloured, slightly rayed 

 Tvith darker. — 1395, 1 sp. vciy ligbt coloiired, beginning con- 

 vex, suddenly becoming flat and slightly rayed in the middle. 



Tablet 1396 contains 2 young sp. var. Lessonii, probably 

 belonging to this species, but perhaps to C. nivea. 



341. Ckepidula nivea, C. B. Ad. 



Or. i. elliptica, suhrotundata, seu maxitne elongata ; tenui, 

 sen incrassatd ; intus nivea, lineis eastaneis radiantibus scepe 

 ornatd ; sublcBvi, seu irregulariter concentrice plus minusve 

 rugosA, seu lamellis extantihus varie instructa ; Umbo acuto, 

 seu maxime planato, lamelloso ; epidermide coiriosA iri'egulari- 

 ter lamelloso, ; superficie seu striuUs coneentricis seu (sub lente) 

 rugulis radiantibus varie ccelatd ; habitu incrementi via; spiralis 

 vertice nucleoso, minimo, Yelutincp. simili, apicem monstrante, 

 castaiieo, rare albo, rugis coneentricis conspicuis i)istmcto, satis 

 prominente, spiraliter subiio augente, dextrorsum deflecto, a mar- 

 glne vix remoto, scBpe ad marginem vecto et detrito ; septo plus 

 minusve in medio angulato seu sinuato, ad sinistram partem 

 plu^ minusve profunde, ad dextram parum sinuato, tenui, lineas 

 incrementi, haud lineam centralem monstrante. 



a B. Ad. Pan. Shells, 1852, pp. 2;34. 320, no. 351 : diagn. 



auct.— (Crypta n.) H. c^ A. Ad. Gen. i. 309. 

 + Calyptrffia (Crepidula) Squama, Brod. Proc. Zool. Soc. 1834, 



p. 40:— Tram. Zool. Soc. vol. i. p. 205, pi. 29, f. 10.— Miill. 



.Si/n. Nov. Test. Viv. p. 151. — (Crepidula s.) Lam. An. s. Vert. 

 Vol. vii. p. G18, no. 16.— C. B. Ad. Pan. Shells, no. 649, 



p. 229.— (lanaeus s.) JS. Sf A. Ad. Gen. i. 370.— ? = Crepidula 



Goreensis, Mice. Zeit.f. Mai. 1851, p. 36, no. 121. 

 + Crepidula striolata, Mke. Zeit.f. Mai. 1851, p. 35, no. 123. 

 + Caljrptraja (Crepidula) Lessonii, Brod. Pj-oc. Zool. Soc. 1834, 



p. 39 :—Tran.s. Zool. Soc. vol. i. p. 204, pi. 29, f. 5.—Mull. 



Si/n. Nov. Test. Viv. p. 149.— (Crepidula L.) Lam. An. s. Vert. 



vol. vii. p. B'ii), no. 20.— (lanacus L.) JI. cf A. Ad. Gen. i, 



p. 370. 



