PLATE LIV. 



PAGK. 



Pig. 1. ASTEROSTBDS STBNOCBPHALUS, Newb 36 



Upper surface of cranium. Ifatnral size. 



Fig. 2. CoccosTEUs occidentalis, Newb 32 



Dorsal shield. Natural size. 

 Sa. Ventro-median plate, inner surface. 



Pig. 8. CoccosTEtfs CUSPID A Tus, Agass 33 



Dorsal shield. Two-thirds natural size. 



Fig. 4. CoccosTEUs DECipiBNs, Agass 11 



Ventro-median plate, external surface. 

 4a, Ventro-mediau plate, inner face. 

 Natural size. 



