- 358 - 



PHAOGIDi.S (PA::7IIU3II:A) 22Q72Ti)U6 n. sp. 



Desorlptlon .- Shell small, v: ' ely inflaterl, wider than 



'-ig-h; antero-dorBal marp'in. nl^.'^htl^' er-'cave ' ■ , '7t?ro-''lors'^:l 



longer, al:nost straight, jainij.. '■" ^joo ueri.'r ^ :io-triu:.cation 

 by a roiu^de"! angle; anteriorly? pro ', ; s low; 



limtile cordate, moderately ir.rnressed; dorsal areas poorl'- defined; 

 external surface scr.! ' " ith numerous, fi. , : "^ jss 



olDSolete radials, separatee by slightly narrower i.. aces; 



the radials absent from the f^orsal areas; entire surface v/ith thin, 

 fine concentric lamellae, sli:~htly crenulated by the ra^lials, often 

 eroded; inner -margin of the valve finely erenxilatc:! . 



Di-'nensions .- I8t. , 7.0 ram..; p"^'"., '".5 :n. ; JcmAfHam.., 1.3 rm. 

 Remarks .- jj.pical form.s '^ '^ • . ■ ^.re rather ra.re and are 



characterized by the niimerous weak radials and thin concentric 



lam.ellae. They are separated from ?. yanu;. by their larger 



size, less inflated ajid less ro ""^ , more obvious radials, 



thinner and more vridely spaced concentric lamellae. 



In addition to the typical valves, from v:hioh the desc i-otion 

 is drav/n, a large iiumber of 'oiizzli' " '"•as are doubtfully referred 

 to this sx)ecies. They "orobably should constitute at least a sepa- 

 rate variety, biit, appearently, they are nestlers, a bewildering 

 arrcy of variation is -rresented. All have in general the same 

 type of sculpture, narro^v, v/eaJc radials and thin concentric lam- 



