oe 
Prof. Parsons on the Origin of Species. 5 
at length determined it to be a fish. Of the second, Murchison 
says in a letter to Miller, ‘‘if not fishes they approach more closely 
to crustaceans than to any other class. I conceive, however, that 
Agassiz will pronounce them to be fishes, which together with 
the curious genus Cephalaspis form the connecting links between 
crustaceans and fishes.” Now, is it too much to infer from these 
facts, and always within the reqsonable limits of generative aber- 
ration, that either of these animals, if a crustacean was so nearly 
a fish that some of its ova may have become fishes; or if itself 
a fish was so nearly a crustacean, that it may have been born 
