rsKuroDON 1087 



below the median line in a faint biangulation ; anterior end 

 a little narrowed, ronnded ; basal and dorsal lines curved ; post- 

 dorsal slope subtruncated ; surface nearly smooth, sometimes 

 having a few feeble wrinkles on the dorsal slope ; epidennis 

 pale tawny or horn colored, with dark rest marks, greenish 

 and having one or two faint rays on the dorsal slope, shining ; 

 teeth one in each valve, subcompressed, rounded, smooth ; dor- 

 sal scars deep, forming a row under the beaks ; muscle scars 

 shallow; nacre dull, lurid purplish, slightly iridescent behind. 



Length 79, height 48, diam. 24 mm. 



Cambodia. 

 Pseudodon cUipticimi Conrad, Am. Jl. Conch., I, 1865, p. 352, 



pi. XXV, fig. I. — Simpson, Syn., 1900, p. 836. 



Two fine shells of this species from the Laos Mountains, 

 Cambodia, are in the Lea collection with other specimens, all 

 bearing the name of Monocondylcea cumingii. As Conrad 

 has pointed out, it is more elliptical, is smoother, is regularly 

 rounded below and lighter colored than cumingii. One of 

 these has slight posterior plications. The color is peculiar. 



Pseudodon zolungej^i (Mousson). 



Shell long rhomboid, convex, subsolid, inec[uilateral ; beaks 

 apparently not prominent ; posterior ridge double, curved, end- 

 ing in a wide biangulation from the median line to the base; 

 dorsal and post-dorsal outlines curved, the elevation being 

 most prominent at the end of the ligament ; base line straight, 

 sometimes a little incurved ; anterior end rounded ; surface 

 rather rough, the epidermis being brown and somewhat con- 

 centrically wrinkled or lamellose ; teeth one in each valve, rath- 

 er stout, elevated and rounded, subcompressed ; nacre brown- 

 ish. 



J^ength yy. height 45, diam. 26 mm. 



Java. 

 Alasmodonta snllingeri Mousson, L. and Suss. Moll. Java. 



1849, P- 96, pl- XVIII, fig. 2. 

 Margaritana zolUngeri Kuster, Conch. Cab. L^nio, 1862, p. 



294. pi. XCVIII, fig. I. 

 Psciidodon zoUingeri Simpson, Syn., 1900, p. 837. 



