LUCINAD.E. 65 



Astarte (Sowerby). Shell roundish, flattened, 

 thick; luimle distinct; hinge-teeth f; the front 

 tooth in the right valve large and thick. Animal 

 with the siphons not fringed. 



A. arctica. A. Scotica. 

 compressa. sulcata. 



crebricostata. triangularis. 



elliptica. Fig. 96 ; n. s. 



97 

 ^ 



(C 



100 



Circe (Schum.). Shell nearly as Astarte, but the 

 hinge-teeth f . Animal with fringed siphonal ori- 

 fices, scarcely projecting ; foot large, heeled. 



C. minima. Fig. 97 ; n. s. 



Cyprina (Lamk.). Shell oval, large, strong ; 

 ligament prominent ; no lunule ; teeth f , f , &. Ani- 

 mal with fringed siphons, short, but projecting. 

 C. Islandica. Fig. 98; J n. s. 



FAMILY II. LUCINADJE. 



Shell roundish, closed ; interior dull, obliquely 

 furrowed ; ligament inconspicuous or sub-internal; 

 muscular impressions lengthened, rough ; pallial 

 line simple. Animal with the mantle-leaves 



