GREEN PEA-URCHIN. 



175 



ECHINI D.E. 



CLYPEASTER1/E. 



Genus Echinocyamus. Leske. 



Cowrie Character. — Body oval, with rounded sides; ambulacra dorsal, five, 

 short ; mouth central, inferior; anus between the mouth and posterior margin. 



GREEN PEA-URCHIN. 



Echznocyamus pusillus. Muller. 



Specific Character. — Body ovate, depressed, beneath concave ; apex central. 



Spatangus pusillus, Muller, Zool. Dan. p. 18, tab. xci. figs. 5, 6. 



Echinus oralis deprcssus, Walker, Test. Min. p. 25, t. iii. f. 88. 



Ovulum marinum, 

 Echinus percxiguus, 

 Echinus minutus, 

 Ech inocyamus mhiutus, 

 Echinocyamus pusillus, 

 Filmlaria, 



Borlase, Com. t. xxviii. f. 26. 



Petiver, Gaz. t. xxxi. p. 10. 



Gmelin. p. 31.94. 



Blainville, Man. d'Actin. p. 214. 



Fleming, Brit. Anim. p. 481. 



Lamarck. 



The genus Echinocyamus is one of the connecting links 

 between the true Echini and the Spatcmgacea. It has the 

 teeth of the former, and the spines of the latter. The 

 little species before us is the least of all the British Urchins, 



