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Super family A 3 A E A 

 Family Limopsidae 

 Genus LIK0PSI3 Sasso. 



111,10^313 OTAIIS Gabb var; SUPRA-OAI^OEIIATA n. var. 



Desoription .- Shell small, longitudinally subovate, moder- 

 ately convex, subecuilateral, Tiosteriorly slightly produced oblique- 

 ly; anterior anci. posterior dorsal marplns straight, the posterior 

 usually long-er; rounded anteriorly and posteriorly, the curve of the 

 posterior margin less full; tunbones prominent, tumid, strongly 

 incurved and slightly opisthog; rate, suboentrsl in i:)Osition; exter- 

 nal siirface covered with almost equ.ally developed radial and con- 

 centric riblets, nroducing a cancellateot sculpture, the concentric 

 riblets showing a tendency toward irregular width, the rcdials more 

 constant; cardinal area relatively vi?ide, amphidetic, interrupted 

 by the small triangular, subumbonal chondrophore; before the chon- 

 drophore five or six almost vertical teeth, the proximal tootb plac- 

 ed under the chondrophore, a short edentulous interval separating 

 the anterior series from the four or five more horizontal teeth that 

 constitute the posterior series; muscle scars obscure; inner e'^ge 

 of the interior margin of the valve finely crenulatei, the crenu- 

 lations tendiiog to become obsolete on the posterior margin. 



