1 62 Bulletin 29 336 



Genus Ljmopsis Sassi 



Limopsis ovalis Gabb 



Plate 26, Figure 10 



Limopsis ovalis Gabb, Trans. Airier. Phil. Soc, vol. 15, p. 255, 1873. 

 Limopsis ovalis Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 4, p. 607, 

 1898. 



We collected a single rather worn valve of a Limopsis which 

 corresponds to Gabb's description of his unfigured Dominican 

 species ovalis. It is somewhat larger than the type and appears 

 to be an aged shell, showing to a marked degree the oblique out- 

 line characteristic of this species on growing older. Greatest 

 length 8.5, altitude 7.5 mm. 



Guppy's L. subangularis from Trinidad has a much squarer 

 dorsal outline, more prominent beaks, and the ribbing is stronger 

 than the concentric lines. In ovalis the ribbing is much feebler 

 than the concentric lines. 



Locality. — (Exp'd'16) Between Hato Viejo and Potrero, 

 Rio Amina. 



Limopsis hatoviejonis, n. sp. 



Plate 26, Figure 11 



Shell resembling in form L. subangularis from Pointapier, 

 Trinidad, but more elegantly sculptured, and with four strong 

 hinge teeth in both anterior and posterior series with sometimes 

 a weak fifth tooth, while subangularis has only about three in 

 each series. The outline is suborbicular, somewhat oblique; 

 hinge line very straight, not sloping as in ovalis; right and left 

 valves equal but the sculpture slightly discrepant, the radials be- 

 ing stronger on the right valve. Concentric sculpture stronger than 

 indicated in subangularis and consisting of thick, rounded, close- 

 set, cord-like ridges, with much narrower interspaces, the latter 

 almost linear; radials delicate but sharp, thread-like, with much 

 wider interspaces; the radials are waved in crossing over the con- 

 centric cords. The inner margin of the valves is crenulated by 



