DESCRIPTION. 129 



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

 dylus Gadaropus. 



Fig. 6. Spondylus Gadaropus. 



Shell slightly eared, spinous. 



Lister Conch. Tab. 206. Fig. 40. 



Specimen white, orange towards the margin, 

 pectinate with knotted ribs on the upper valve, 

 lower one tuberculate and rough, obliquely pec- 

 tinated. 



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. 



