CALI.-PARVUS GROUP OF UNIONID^. 49 



the >li('lls Iicrciii iiMincd show most inaikccl i-csciuMmih-cs. If 

 the TcxMs tonus Itc cxcluclcd as synoiiyins, then llicy will 

 fall uikIci- t he (li\ isioii hradcd hy l^. jxirriis. 



Tlic main fads on whicli tliis species reduction is based tire 

 set forth in tln' suhjoinetl tabular synopsis. 'I1ic various 

 species have Ixh'h studied in sucli detail as lariie series of shells 

 from all sections of tlu' south and the west would enable. In 

 some cases authors" types have been available. 



