P L A T K X L AM I T . 



Pl.IOCENE AND RECENT I'ICCTENS. 



[Unless iilhcrwise slatt.'tl nU tii^nros aro apiimxiinatt'ly natural size.] 



Page. 



Fid. 1. rccfeii (LiiriijierlPH) iixjilcjii n. sp. U. C. Type 122 



Exteriiir nf l(>ft valve; altitmle l.'i.'i iiini. Pliopeiie, Oei'i-os Islaml, (iff Lnwer California. 



(II.) 



Fi(i. 2. Peden (P-wndiimuniiim) ran<lolj<lii l».ill. C. S. N. M. 10774!!. i:iS 



Exterior of right valve; altitude L'n iiiiii. Recent, off Destruction Islaml, Wash., old 

 fathoms. (U. S. Fish Com. station :;:;4:;. ) (M. ]'.) 



Fig. 2a. Same specimen as 11^. 2 - I'W 



Exterior of left valve. ( M. P. ) 

 Fi(i. 3. Perh'ii {Pxenihimm^iuin) rrindol/ilii Dall var. lilliiiii(Hil:i'ii-':is n. var. C. S. N. M. 1.5023:-!. 



Type - 139 



Exterior of right valve; altitude 30 mm. Recent, nff Tillamook, Oreg., 7S(i fathoms. 

 (C. S. Kisli Com. station .3346.) ( M. P. ) 



Fi(i. 3(1. Same specimen as iig. 3 139 



Exterior of left valve; altitude 31 mm. (M. B.) 



240 



