PART II, 



M Y AD^. SOLENINjE. 



365 



Family 2. MYAD^. Gaping Bivalves. 



Shells regular^ always with defined cardinal teeth ; 

 valves more or less gaping at one or both extremities. 



SuB-FAM. SOLENIN.E. Salens. 



Shells generally linear, and always open at both extre- 

 mities ; cardinal teeth distinct. 



SoLEN Linn. Shell very straight, broad, linear, and of 

 equal length throughout ; umbones very small, ter- 

 minal ; cardinal teeth small ; ligament long, exter- 

 nal. 



truncatus. Sow. Gen. f. 1. vagina. lb. f. 2. (Jiff. 116. b.) 



Ensatella Sw. Shell slightly curved. 



E. Eiu'opea Stv. {Solen Ensis Auct. ) 



NovAcuLiNA Benson. Straight, of equal length 

 throughout ; the extremities rounded ; umbones 

 towards the middle ; cardinal teeth ^ ; dorsal margin 

 slightly thickened. 



N. Gangetica. Sow. Man. f. 63. 



