DONAX. 405 



Sub-gcn. latona, Schumacher. 



Shell ovate wedge-shaped, compressed posteriorly, abruptly 

 truncate anteriorly ; inner margin of valves entire. 



abbreviatus, Lam. faba, Chem. 



australis, Lam. Lessoni, Desh. 



bicolor, Gmel. Ticaonicus, Hanley. 



columbella, Lam. tinctus, Gould. 



compressus, Lam. trifasciatus, Reeve. 



corbuloides, Desh. veneriformis, Lam. 



cuneatus, Linn. vittatus, Lam. 

 deltoides, Lam. 



Sub-gen. hecuda, Schumacher (Donax, Scop., not Linn.). 



Shell triangular, sub-cordiform, anterior slope acute, flat; 

 margin of valves not quite entire. Hinge with a lateral tooth 

 on each side. 



asper, Hanley. dentifer, Hanley. 



carinatus, Hanley. pubescens, Linn. 



culminatus, Cpr. scortum, Linn. 



Sub-gen. serrula, Chemnitz (Cuneus, Gray, not Da Costa or 



Miihl/eldt). 



Shell ovate-triangular, wedge-shaped, gibbous anteriorly; 

 margin of valves strongly denticulated. Hinge with the carti- 

 lage-fissure oblong. 



seneus, Mdrch. Californicus, Com: 



aSmis, Desh. Carpenteri, H. and A. Adams 

 anatinus, Lam. (semistriatus, Cpr.). 



bellus, Desh. Conradi, Desh. 



bitinctus, Reeve. contusus, Reeve. 



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