OSTREAD^E. 



73 



hinge usually toothless ; one muscular impres- 

 sion only, placed behind the centre ; pallial line 

 obsolete. Animal with the mouth widely open, 

 scarcely adherent to the shell ; no siphons ; foot 

 often wanting ; where present, minute, and capable 

 of spinning a byssus in early age. 



Lima (Brug.). Shell oblique ; front side straight, 

 gaping ; hind side rounded, closed ; beaks separate, 

 produced into ear-like lobes ; hinge toothless ; car- 

 tilage internal, in a central pit. Animal with the 

 mantle-edges double, the inner one hanging like a 

 curtain, fringed with long tentacles; foot finger- 

 like, grooved. 



L. hians. Fig. 116 ; J n. s. L. subauriculata. 



Loscombii. 



116 



117 



Pecten (Miiller). Scallop. Shell round, nearly 

 equal-sided, resting on trie right valve, which is 

 the more convex, marked with radiating ribs ; 

 beaks central, close together, produced into ears. 

 Animal as Lima, but with conspicuous gem-like 

 eyes along the outer edges of the mantle. 



P. Danicus. P. similis. 



striatus. 



maximus. 



