CONCHOLOGY. 



PLATE CV. 



PERNA ISOGNOMUM 

 GREAT BLACK HOUND'S-EAR PERNA 



Bivalve. 



generic character. 



Shell subequivalve, flat, rather deformed and scaly on the out- 

 side: hinge linear, with many perpendicular teeth, which do not 

 alternate with those of the opposite valve ; the teeth placed parallel 

 to one another, and the intermediate longitudinal spaces form each a 

 furrow, in the interstices of which the ligament of the hinge is 

 inserted : one side of the hinge salient, the other side under the hinge 

 rather protuberant, gaping, and forming an avenue through which 

 the byssus is protruded. 



SPECIFIC CHARACTER 

 AND 



SYNONYMS. ^ 



Shell equivalve with a larger lateral lobe, or having the anterior 

 lobe produced. 



Perna IsoGNOMUM : testa equivalvi : lobo laterali majore. 



