128 $ RHINOSTOMA COCCINEA. 



The rostral plate, thq|igli prolonged in both, is of very diflerent form, and is 

 carinated above in Hoferodon, and not in Rhinostoma; even in their teeth 

 they arc not much mSe allied to Hcterodon than to Tropidonotus. The 

 posterior large maxillary teeth are much more erect here than in cither of those 

 genera. 



In short, then, their whole "physionomie" in life is different. The small head — 

 the slightly projecting superior orbital plates — the small eyes — give the Rhinos- 

 toma coccinea a mild and placid look, which really appertains to its character; 

 while the broad, flattened head — the projecting superior orbital plates, like the 

 Crotaloidea, gives an Heterodon the look of a bold, blustering fellow, as he is. 



