- '^'9 - 



fore hardls; cervicealile for -nrrrDo^-es of correlation, the remain- 

 ing belonging to tne follov.injj- ^.tviei^a, v/i th a ;„ ;_jt' c iu '^ Oo uiiuh 



■V. 



genus, Phacoides , Jardi-gm . .^itlgona, Tcll.ina and ^■'■acoma . In 

 addition to the identical species, a ntznihe r of Bowden forms 

 have their cloiieiit ai'finitiea vvith Ohipolan lipeeiuu; L-i.uje 

 BoV'den- forras include Area ( Soa-pharca ) i ne c ui 1 at e r al i o , A, 

 ( Scapharc a ) agnag tha , Pteria -orepocera, Pecten ( Ohlam;. s ) 

 oelli'oictua . Lima stenoeo,- oabi: , Julia garcnerae , t_he t'./o Scam- 

 bulas, Kontacuta (?) menotreta and 3:-.rdium ( ?rggum ) elattocoGt- 

 atuqi . There is alco a 'Dardium s. s ., a ^^'uhgenus which in other 

 American areac is not /.nov.n to survive t ;-f -ligocene. 



Without any douht the Oliipolan elements are completely 

 over.-hadowed hj- the lar'^-e number of riore modem cor-rHiituentc, 

 especiall:/ t'loce that involve t..e livcroelucti n o£ f-'ii; irely new 

 groups of sectional or greater valiie. It is difficult, hovvever, 

 to i-nternret the cip-niiicance of these raor' em. element s v/ith re- 

 gard to ape relation:-. 3i:iee the 'i jx xcsunal facie s is in- 

 volved . xany of the post-i-Ohipola elements in the Bowden assem- 

 bj ;:--'e "re fojv.^ri amonrr the chsrseteriGticall:; tropical gro ' d 

 it r:iay oe contended that the later rertiar^ aspect of ti'e .L.una 

 is due to the fact that is a strictly tropica" pjia, the first 

 America.n trooln-..l fanr.a of any im"ortance that hac reeieved consid- 

 eration. It muct be rememberea aliiOi tia^^ t^iie ^hipj-i.;-: fauna is 

 the oldest of the -^lura Bluff fauiias. Tnether the slightl. 



