SIMPSONELLA 1073 



Margaron (Anodonta) crepera Lea, Syn., 1852, p. 50; 1870, 



p. 80. 

 Dalliclla crepera Simpson, Syn.. 1900, p. 833. 

 Simpsonella crepera Haas, Conch. Cab., Unio, 1912, pi. 25, 



fig. I. 



The dimensions given above are from the type, which is a 

 larger shell than any specimen T have ever seen of piwpurea. 

 It is more evenly obovate and more elongate in proportion 

 to height as a rule than that species, and the color is rather 

 more dull. The teeth are, perhaps, more faintly developed. 



Simpsonella tenltis (Lea). 



Shell decidedly long rhomboid, narrowed somewhat in front, 

 inequilateral, thin, scarcely inflated ; beaks neither full or high 

 but sharp pointed, sculptured with strong, zigzag ridges; pos- 

 terior ridge quite full, rounded or feebly biangulate, ending 

 below the median line; dorsal line nearly straight; anterior 

 end rounded, subangulate above ; base line straight or very 

 slightly incurved in the middle : dorsal slope obliquely trun- 

 cated ; posterior end rounded below ; surface with rather strong 

 growth lines, dull greenish-brown, sometimes faintly rayed ; 

 teeth linear and almost obsolete ; nacre bluish, flesh-colored or 

 purplish, dull, but iridescent behind. 



Length 76, height 41, diam. 24 mm. 



Luzon Island, Philippines. 

 Anodonta tennis Lea, Pr. Zoo. Soc. Lond.. 1850, p. 198; Jl. 



Ac. N. Sci. Phila., IV, i860, p. 237, pi. xxxiii, fig. 116; 



Obs., VII, i860, p. 55, pi. XXXIII, fig. 116. — Musgrave, Phot. 



Conch, I., 1863, pi. I, fig. 8. — Clessin, Conch. Cab. Ano,. 



1863, p. 99, pi. XXX, figs. 3, 4. 

 Margaron (Anodonta) tenuis Lea, Svn., 1852, p. 53; 1870, p. 



83. 

 Anodon tenuis vSowerp.y, Conch. Icon., XV^I, 1867, P^- ^^^ fig"- 



55- 

 Dalliella tenuis Simpson, Syn., 1900, p. 833. 



Simpsonella tennis Haas, Conch. Cab., L%io, 1912, pi. 24, 

 figs. 4-5. 



