VENUS.— Plate XIII. 



The radiated linear coloiiring of this species is a cha- 

 racteristic feature. 



Species 49. (Mus. Cuming.) 



Venus Nuttalli. Ven. testa pectinato-cuneiformi, crassd, 

 albidd, versus iimbones ferrugineo tinctd, radiatim 

 niiide liratd, llris medianis anyiistis, teniiibus, concen- 

 Irice liratd, liris laminaio-rejkxk, versus marginem 

 anticum numerosis, valde irregularibus, lunula violaced, 

 area ligamenti late plario-excavaid. 



Nuttall's Venus. Shell pcctinately wedge-shaped, 



thick, whitish, stained towards the umboes with 

 inist, radiately neatly ridged, middle ridges narrow, 

 thin, concentrically ridged, ridges laminately re- 

 flected, crowded towards the anterior margin, veiy 

 irregular, lunula violet, ligamentary ai'ea broadly 

 flatly excavated. 



Conrad, Acad. Nat. Sci. Philadelphia, vol. vii. p. 250. 

 pi. 19. f. 15. 



Hah. California. 



As the neat radiating ridges on approaching the margin 

 become more distinct, the concentric anterior laminar 

 ridges are more crowded. 



