122 



Spondylus coccineus 



crassisquama 



spathuliferus 



ducalis 



longitudiualis 



Spondylus violacescens. 

 [There are also four fossil species.] 



Spondylus microlepos 



croceus 



aurantius 



radians 



zonalis 



PODOPSIS. 



Encycl. Method, plate 18$> Jig. 6, 7- 



Th e G. Podopsis is only known in a fossil state ; il near- 

 ly approximates the Gryphaea, from which it is only 

 distinguished by the summit of the lower valve not 

 being recurved, though much advanced beyond the up- 

 per valve, either above or at the side. These shells are 

 also allied to the Pectinides, by the regularity of their 

 shape, their longitudinal striae, and their substance 

 not being foliaccous. Shell inequivalve, subregular, 

 attached by the summit of the lower valve, without 

 ears, lower valve larger and more convex than the up- 

 per, with the beak advanced above or on one side. 

 [Two fossil specie s | 





