﻿214 II^■Rl()l'SlS 



rounded below; base curved, a little fuller behind the middle: 

 dorsal sloi)e almost squarely truncated ; lower posterior out- 

 line rounded ; posterior ridj^e low, rounded ; beaks scarcely 

 elevated ; hinge line somewhat curved ; teeth compressed ; lat- 

 erals prominent l>ehind ; nacre pale bluish, rose-tinted, with 

 livid blotches in the cavities. 



Length 38, lieig'ht 28, diam. 15 mm. 



Kapoeas, J5orneo. 

 Unio fiih'aster Drouet and Chafer, Mem. Soc. Zool. Fr., V, 



1892, p. 154, pi. VI, figs. 11-13. 

 Nodularia fuh'oster Simpson, Syn., 1900, p. 819. 

 Contradcns fulvastcr Haas, Conch. Cab., 1912, pi. 20, figs. 4-5. 



[Vobably a young shell, and I cannot be sure as to its rela- 

 tionshi]!. In the Synopsis I ])laced it in Nodularia, but I am 

 now inclined to believe it may be an Hyriopsis. The authors 

 state that the beaks of their shell are eroded and make no men- 

 tion of any sculpture on the disks. The color seems to be a 

 light brown. 



IIvRiorsis piNCHONiANA (Hcude). 



Shell subsolid, almost regularly elliptical, compressed, with 

 a low, somewhat double posterior ridge ; beaks slightly ele- 

 vated, their scul])ture not observed ; dorsal region having ves- 

 tiges of posterior wing ; epidermis yellowish-brown with faint, 

 green rays ; pseudocardinals compressed, ajiparently one in the 

 right valve and a feeble lamina above it ; anterior muscle scars 

 impressed ; nacre pale salmon-color, somewhat iridescent. 



Length C)^. height 35, diam. 1 5 mm. 



Tch'eng-tou fou. Province of Se-tchouan, China. 

 Unio fuichonlanU'S Heudk, Conch. Fluv. Xank., \lir, 1883, 



pi. i.xiir, fig. 12. 

 Hyriopsis pinchonianus Simpson, Syn., 1900, p. 580. 



The specimen figured by ITeude is nearly evenly elliptical in 

 outline, showing traces of bianguation behind, and having a 

 curved base line. The figure shows ragged traces of a post- 

 dorsal wing. 



