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Superfamily I J A :■ D I A J li A ? 

 Pamilj' Tenafaciciae ? 

 Genus ..... .^.^^.^ n. ^:en. 



/ 



Bt^-molo^"3' .- ^e-i/os , strange; facie s , aspect. 



Shell araall, he^vj?, el '^ -^ '.•' t e , inecuilateral, strongly con- 

 vex, subrostrate posteriorly, with the l^aae eniarginated; loia'bones 

 turnLfl, cleoide'lly prosogyrate; lunule large, limited 'by an incis- 

 ed li.ie; ligament area very narrow, external, opisthodetic, tlie 



edge of the hiix^re plate belop/ the ligament thickened; hinge 



I 10101 

 heavy, dental formula ; the ri;-ht cardinals suhparallel 



?. 01010 

 to the hin-'e nErgiri, "fiie 'ooste.;ior cardinal tJiickened, toward 



the posterior end, compressed and arched toward the anterior 



end for the reception of the piximinent midcile left cardinal, 



the anterior cardinal heavy, ventral in position; left valve 



v/ith a prominent, ohtuse, middle cardinal. Joined ahove to the 



smaller .aiiterior cardinal, he lov/ which the an.t erior tjocket is 



situatel, posterior cardinal weak, compressed, separated from 



the middle cardinal by a wide, deep socket; pallial sinus small, 



subangular; inner ventral margin of the valve flattened^ va th 



a few tangential grooves. 



Type .- Xenafacia b07:deniana ^Dall) 



The type of this gemis was considered by 0- 11 an immatuns 

 Anoinalocardia . Although the uatline and pallial sinus siiggest 

 /unomal o c ard i a . the hinge is not of the veneroid type. The 



