expected from the current corxCeption, VAany elements are common 

 to the ■^ov'jden and "Jhi'oola faunas, the latter 'beir!''^ the richest 

 of the Alur.i "^lii f fa>.:-^ic- .., ' .ignif leant ^'':- :r^-' of the 



groupri have closer affinitieii with Duplin and c ■^iccaraaw 



and Oaloocahatshie forms. The more important of the^e modern 

 elements will he mentione-". 



'The tarrondonts supply one-third of the total numher 

 of Recent species included in the Bovrden fauna and all of theoe 

 are found among th^^ :^-... c, " -f-v.-^-f- -^hoi; ^--mil^ , eeiall^: 



the suhfamilj' Arcinae, ha 1^: mo^ .s:ect. ?i7e 



fiecent Areas are included in the list and several others, A. 

 ( Irgina) toleoia v; r. microtert, .. (Ounearce.) o"othanta and 

 A. ( ocapharca) prephaina have very clOGely allied P.ecent forms, 

 ^rhe mere ntimher of Recent opecies is of minor i:-portance .:;iace 

 four such are found in the Ohipolt. .\^.^._ ' three in the Tam- 

 pa. A modern element is, however, furnitjhed hy the introduct- 

 ion of the section Bathyar^a . - The most ahuvidant Area, A. 

 ( 3cs.pharca ^ halicTonta i ;. oloi^ely related throu?:-h its v.-:^riety 

 hiapaniolia to the Iliocene and ?lioce-\e lienoca and the Recent 

 secticostata . 



lY'O of the three oyGt'ir:^ -v^ oelieved to he i'-">"- 

 cal' with Recent g-oecies. If the synonymy for 0. me god on it 

 aceeptea.this species furnishes one of the interesting example f; 

 of a fc ■'istribution on hoth £:ides of the Isth.ra.. of ''^anamc 



and a -oresent restriction to the Pacific aide. The occurrence 



