﻿4^4 noNinivA 



only moderately full and elevated, their sculi)ture a few stron^"^ 

 bars rnnning" nearly parallel with the growth lines, posterior 

 ridge usually very high, often pinched up into a sharp carina 

 and ending behind at the base of the shell in a point ; posterior 

 end obliquely truncated ; surface generally having rude, un- 

 even growth lines ; epidennis yellowish-green to blackish, when 

 light colored sometimes banded or clouded with green, occa- 

 sionally feebly rayed ; hinge having a rudimentary, compressed, 

 smooth tooth in each valve^n the region of the beaks and in 

 young shells there are commonly vestiges of laterals ; beak 

 cavities shallow, with scattered dorsal scars ; anterior muscle 

 scars irregular, often separated ; nacre lurid purplish or pur- 

 ple brown, not iridescent. 



Length 93, height 44, diam. 35 mm. 



Length 93, height 48, diam. 30 mm. 



Central California; north to British Columbia; east to Idaho. 



Type locality, Lewas' River. 

 Anodonta angulata I,ea. Tr. Am. Phil. Soc. \'\, 1838, p. 97, 



pi. xvr, fig. 52; Obs.. II, 1838, p. 97, pi. XVI, fig. 52. — Han- 



i-ivY, l)iv. Shells, 1843, P- 222, pi. XXIV, fig. 15. — Chenu, 



Man., 1859, II, p. 146, fig. 722. — Reeve, Elem. Conch., 11. 



t86o, pi. XXXI. fig. 180. — Ceessix, Conch. Cab. Ano.. 1874, 



p. 159, pi. i.iii, figs. 3, 4. — Hemphill, Zoe., I. 1891, p. 326. 



pi. X, figs. 5, 6. 

 Margarita (Anodonta) angulata Lea. Syn., 1838, p. ;^2. 

 Margaron (Anodonta) angulata Lea, Syn.. 1852, p. 52 ; 1870, 



p. 83. 

 Anodoii angulata Cati.ow and Reeve, Conch. Xom., 1845, P- 



66. 

 Gonidca angulata Simpson. Syn.. 1900, p. 658. 

 Anodon angulatus Sowerhy, Conch. Icon., XVII, 1867, pi. in, 



fig. 6. 

 Anodon frniinalis nori.n, Pr. Post. Soc. N. Hist., Ill, 1850, p. 



203- 

 Anodonta fcniinalis Gould. U. S. Expl. Kxp., XII. 1832. p. 



436. figs. 547, 5470, 547&. 

 Anodonta randalli Trask. Pr. Cal. .\c. N. Sci., T. 1855, p. 29. 



