- 11 - 



Thg 2:en.v!G Jarcliiim . i_ ented \)2: eleven L/pecie.3, 



grouped into seven see-^i-ns, raiirs aniou?'- the lar-c renera 

 and v/ith ;.lie ov/u rxoi/Ofjc'-riLituu ohe faiail^- jaj-'diidae 11; elevat- 

 ed to a. position of iriportanee. The sections present are thoce 

 that are foiind in an^,^ troriical or sii-otro-oical rjid-Tertisry 

 imericaLj. ia.a,.a, but Jctc^.l; uoderraa and Pa'o;yridea a re not included 

 and the Trigoniocardias, vfoich are peculiar to the min-Americaji 

 and .'jitillean rer-ionc, are a conrrnioizouG element; in fac!;, :._ 

 of t;-e jrigoniocardias is the meet abundant bivslve in the 

 entire 



2he nost -ouzzlim- form is a small ;:.-«ci • ''- -VL-evlous- 



Ij^ was described as Sja immatiTre JLnomalocar ^ia . In the light of 

 the additional material at hand, however, such a vit 

 able and it Is' vjroriosed to consider th.is v^ x^cirr +;^, of' 



£ new genus v/hieh ' .lestionable xDlacel among the Isocardiacea, 

 probably near the familv Vesicomyacidae. 



- The family; 7enerifl-e -:-irer'er.tn r m. thpr ■;ini--5^1 ascem- 



blag-e of genera and species. Jhe genera are divided among the 

 subfamilies Meretrioinae, Venerinae aiid G-emminae, the majority 

 belon-nn^ '-o the first of these. The genv;: Chi one i^ -i e -•-)Et 

 abun ant, ;vith regard to both the n ytfoe r of soeei : indi- 



viduals. Para^starte , represented by a single valve, has here- 

 tofore not been found outside the Ploridian rp^-i^'-, -either re- 

 cent or fossil and ^ivcla does not aoorar in any of the other 



