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LII.I0P3IS jmiAIOENSIS n. sp. 



Desaription .- Shell minute, beavy for the size, suhorbi- 

 oular, convex, slis-htly compressed in the distal postero-dorsal 

 re,p-ion; anterior dorsal mar in short and direct, posterior dor- 

 sal margin longer and sloping gently dovmward; dorsal portion of 

 anterior lateral r:iar?rin slirhtly ezcavated, the remainder curving 

 "broadly and evenly into the ventral rrargin; posterior lateral mar- 

 gin less broadly curved and passing more abruptly into the ventral 

 mar^^in, producing a slight posterior obliquity; umbones relatively 

 prominent, decidedly inflated; e: temal sculpture of fine, widely 



seiDarated concentric raised lines, the interspaces being broad- 

 est in the central portion of the shell, and less prominent, but 

 more frequent, radial riblets; at the points of intersection of 

 the two sets of sculpture conspicuous irregular blisters, absent 

 in the umbonal region; posterior portion of the narrow car'linal 

 area longer; chondrophore small, triangular; teeth in two discrete 

 series separated by a relatively v; id e edentulous area, the three 

 teeth of the anterior series heavy, vertical and placed near the 

 dorsal -largin; the three posterior teeth weaker, almost horizon- 

 tal, situated further from the dorsal margin and placed one be- 

 low the other in a ^^ently curve' series; inner margin of the valve 

 faintly crenulated, the crenulations coarsest on the ventral por- 



