VENUS. 



Plate XI. 



Species 35. (Mus. Cuming.) 



Venus Californiensis. Ven. testa orhicnlari-cordatd, 

 mhohliqud, valde bueqnUateraU, paUide fuho-cinered, 

 concentrice erecto-laminald, laminis versus warginem 

 obtusis, covfertis, interslitiis longitiidinatiter liratis, 

 lirls irregidaribus, transversim corrugato-striatis, area 

 ligamenti amplUer concavo-excavatd. 



The Califoknian Venus. Shell orbicularly heart-shaped, 

 rather oblique, very inequilateral, pale fulvous-ash, 

 concentrically erectly laminated, lamina; obtuse and 

 crowded towards the margin, interstices longitu- 

 dinally ridged, ridges irregular, transversely wrinkle- 

 striated, ligamentary area largely concavely exca- 

 vated. 



RuoDEKiP, Pro. Zool. Soc. 1835, p. 43. 

 Femis leiicodon, Sowerby. 



Ifab. Guaynias, Gulf of California (in sandy mud at low 

 water) ; Cuming. 



This fine species, it will be seen, is of remarkably cor- 

 il.-itc growth, but at the same time orbicularly depressed. 

 The ligamentary area is unusually large and rather sharply 

 concavely excavated. 



Species 36. (Fig. a, b, Mus. Cuming.) 



Venus Amathusfa. Ven. testa subti'igono-ovatd, falvo- 

 spadiced, cotirentrice htminatd, laynhiis nunc confertis, 

 nunc distaniibns, crenatis et erecte muricato-squa- 

 matis, interstitus longiludinuVder liratis, liris bints, 

 latere postico suljjiexuoso, lunula et area ligamenti vio- 

 laceo-tinctis. 



The Amathusia Venus. Shell somewliat triano-ularlv 



ovate, fulvous-drab, concentrically laminated, laminse 

 sometimes close-set, sometimes distant, crenated 

 and erectly prickly-scaled, interstices longitudinally 

 ridged, ridges in pairs, posterior side rather flexuous, 

 lunule and ligamentary area tinged with violet. 



Philippi, Abbild. imd Besch. Conch, pi. 11. f. -t. 



Hab. Gulf of California. 



Chiefly distinguished from V. Giiidia by its more tri- 

 angularly ovate form, and by the more flexuously produced 

 growth of the posterior extremity. The radiating ridges 

 in the interstices between the lamina; are moreover more 

 distinctly set in pairs without any intermediate raised 

 stria or smaller ridge. 



Species 37. (Mus. Cuming.) 



Venus Gnidia. Ven. testa subtrigono-ovutd, zentrico- 

 siusculd, fulxescente-spadiced, concentrice laminatd, 

 laminis crenatis et erecte muricato-squamatis, inter- 

 stitiis radiatim liratis, liris vix binis, lira minutd in- 

 terveniente. 



The Gnidia Venus. Shell somewhat triangularly ovate, 

 rather ventricose, fulvous drab, concentrically lami- 

 nated, laminee crenated and erectly prickly-scaled, 

 interstices radiately ridged, ridges scarcely in pairs, 

 with a small ridge intervening. 



Bboderip and Sowerby, Zool. Journ. vol. iv. p. S6i. 



Hab. San Bias, Mexico. 



The scales with which the concentric lamina; of this 

 species are so elegantly festooned, are more prickly pointed 

 in the smaller varieties of the species. 



April, 1803. 



