134 SPECIFIC 



the hinge, besides lateral teeth ; upper valve with 

 a prominent perforated apex. 



Bor7i. Mus. Cces. p. IIG. vign. 



Specimen very pale cinereous ; striated trans- 

 versely ; striae scarcely perceptible. The annexed 

 figure represents the interior of the upper valve 

 with the lateral teeth of the hinge. 



Inhabits the Mediterranean Sea. 



Fig. 2. A. Ephippium. 



Shell suborbicular, rough, undulate, the flatter 

 valve perforated. 



Lister Conch, tab. 204. fig. 38. 



Specimen white, convex valve purplish, satu- 

 rated towards the apex, silvery within and without 3 

 translucent, brittle ; rather lamellate. 



Inhabits the Indian and American Ocean. 



Fig. 3. Hinge of A. Sella. 



Fig. 4. Mytilus Frons. 

 Shell plaited 3 one lip scabrous. 

 Born. Mus. Cces. p. 121. vign. fig. 6. 

 Specimen reddish, oval 3 the margin on both 



