- 17 6 - 



Jamily Pteriidae. 

 Genus PTSRIA Scopoli. 



PTERIA PEEP0G2RA n. sp. 



Desoription .- Shell small, moderately and "broadly inflate^^ 

 along a rlia°"onRj^ from the vimho to the postero-ventral marrin, the 

 greatest oonverity meciial and rising a'bruptly from the anterior 

 lateral margin, descending more gently posteriorly and ventrally; 

 dorsal mar?-in m.oderately long, strrip-ht; umhones lov.', scarcely 

 rising above the dorsal r:argin; anterior auricle small, triangular, 

 depressed, set off from the rest of the shell hy a lei'ge along the 

 line of the narrow hyssal sinus; srirface of the shell smooth ex- 

 cept for obscure sinuous incrementals on the anterior auricle ; 

 cardinal area very narrow, lorn'", extending almost to the extremi- 

 ties of the forsrl mar^i-in; '■'in-e^ -^f right valve T7ith a soclcet 

 placed slirhtly before the umbo and a lateral lamella near the 

 posterior end of the dorsal mar?rin. 



Dimensions .- Length, about -'^ ^'ii^i. ; ■-'^'"., 11 nmi. ; seraidiam. , 

 5.2 mm, . 



He marks .- 2.* prep oc era is represented by two somev/hat frag- 

 -"-entary ri ^-ht vs.lves. -he incom'oleter.ess of the posterior r^ortion 

 of both valves le?:^ves some doubt as to the outli: c, biit it '-^ay be 

 Judge -1 that the shell is not much produced along either the post- 



