PSEUDODON 1085 



PsEUDODON AUREUS Heudc. 



Shell rather small, subsolid, rhomboid, inflated, inequilat- 

 eral ; beaks somewhat elevated but not inflated, strongly undu- 

 late ; anterior end rounded ; base full at the middle ; post-dor- 

 sal outline subangulate behind the ligament, below the angula- 

 tion obliquely truncate; posterior ridge elevated, apparently 

 somewhat double, ending near the base of the shell in a blunt 

 point ; epidermis yellowish-green ; nacre fuscous-salmon. 



Length 30, height 20, diam. 15 mm. 



China. 

 Pseudodon aureus Heude, Conch. Fluv. Nank., IX, 1885, pi. 



Exxii, fig. 140. — Simpson, Syn., 1900, p. 836. 

 Margaritana anrea P^tel, Conch. Sam., Ill, 1890, p. 172. 



A small, inflated, decidedly rhomboid species, which would 

 seem to be most nearly related to F. harmandi. I have never 

 seen it. 



Group of Pseudodon vondembuschianus. 



Shell rather large, somewhat compressed, subsolid, elliptic- 

 rhomboid, wider behind, where it is widely biangulate ; teeth 

 compressed. 



Pseudodon vondembuschianus (Lea). 



Shell irregularly subrhomboid, scarcely subsolid, subcom- 

 pressed or convex, inequilateral ; beaks only moderately full 

 or high ; posterior ridge sometimes faintly double, ending in a 

 blunt point below the median line ; dorsal outline nearly 

 straight or lightly curved, raised into a low wing behind ; 

 anterior end a little narrowed, rounded, angled above ; base 

 line curved, fullest behind the middle ; dorsal slope obliquely 

 truncated; surface nearly smooth; epidermis pale olive-green, 

 smoky, darker and a little rougher on the dorsal slope; teeth 

 one in each valve, subcompressed, smooth ; dorsal scars deep ; 

 muscle scars shallow ; nacre dull, lurid purplish, often blotched 

 in the cavities. 



Length 72, height 44. diam. 20 mm. 



Java ; Sumatra ; Borneo ; Malacca. 



