Io82 PSEUDOnON 



concentrically, wavy snlcate ; hing-e with a strong- triangular 

 pseudocardinal in the right valve, having' a decided excava- 

 tion behind it, and at the posterior side of the pit a faint tooth ; 

 there is one strong- triangular tooth in the left valve and a 

 vestige of one in front of it at the upper edge of the shell; 

 anterior scars irregular ; dorsal scars crowded close to the 

 hinge line. 



Type, Monocondyla-a crehristriata -\nthony. 



PsEUDODON CRECRiSTRiATus (Anthony). 



Shell subrhomboid, rather solid, convex, inequilateral ; beaks 

 apparently but slightly prominent ; posterior ridge inclined to 

 be double, ending in a wide, feeble biangulation near the base 

 of the shell ; dorsal and basal outlines slightly curved ; anterior 

 end a trifle narrowed, rounded ; dorsal slope obliquely trun- 

 cated ; surface with rather fine, irregular, concentric sculpture 

 and light radial sculpture on the dorsal slope ; epidermis 

 brownish or yellowish-brown, rather dull ; left valve with a 

 strong, triangular tooth, a triangular pit in front of it and a 

 feeble anterior tooth ; right valve with a strong, triangular 

 anterior tooth, a triangular pit behind it and a feeble posterior 

 tooth ; muscle scars well marked ; nacre dull, lurid, bluish, with 

 a flesh-colored tint in the cavities. 



Length 60, height 38, diam. 22 mm. 



Burma ; Pegu ; Cambodia ? 

 Monocondylcea crehristriata Anthony, Am. Jl. Conch., I, 1865, 



p. 205, pi. XVIII, fig. I. 



Trigonodon crehristriata Conrad, Am. Jl- Conch., I, 1865, P- 



233- 

 Margaron (Monocondylcea) crehristriata Lea, Syn., 1870, p. 



72. 

 Unio crehristriatns Sowerry, Conch. Icon.. XVL 1868, pi. xcv, 



fig- 5^7- 

 Trigonodon crebristriatuni Hanlev and Theobald, Conch. 



Ind., 1876, p. 5, pi. Tx, fig. 3. 

 Pseudodon crehristriatns Simpson, Syn., 1900, p. 835. 

 Unio vondemhuschii Sowerby, Conch. Icon., X\^L 1868, pi. 



xcv, fig. 518. 



