PHRYNOSOMA DOUGLASSII. 105 



Mr. Bell took his description and figure was brought from the Oregon or 

 Columbia river by Mr. David Douglas, wjiose name he has given to the species. 



Dumeril and Bibron* have greatly erred in supposing this to be the young of 

 the Phrynosoma orbicularis, which they probably inferred from the size of Bell's 

 figure. That it is an adult animal, and perfectly distinct from all others of the 

 genus, I have not the least doubt, as I have seen a specimen, the one from which 

 the accompanying plate was taken, brought alive to Philadelphia from the banks 

 of the Oregon, that equalled in size any Phrynosoma cornuta or orbicularis that I 

 have ever seen, and yet having no spines about the head. 



* Hist. Nat. des Rept., torn. iv. p. 314. 



Vol. II.— 14 



