DBS C R I PTION. 129 



Fig. 5. Hinge of the flatter Valve of Spondy- 



Lus Gcedaropus. 



Fig. 6. Spondylus Gcedaropus. 



Shell slightly eared, spinous. 



Lister Conch, tab. 206. fig. 40. 



Specimen white, orange towards the margin, pec- 

 tinate with knotted ribs on the upper valve, lower 

 one tuberculate and rough, obliquely pectinated. 



Inhabits the Mediterranean, Red, Indian, and 

 American seas. 



The varieties of this species are extremely nu- 

 merous ; those which are furnished with spines are 

 considered the most valuable, and increase in esti- 

 mation in proportion to the length and beauty of 

 the appendages. 



PLATE VIII. 

 Fig. 1. Hinge of Chama Gigas, 



Fig. 2. Chama Gigas. 



Shell folded, ribs with arched scales ; posterior 

 slope gaping. 



K 



