CLASSIFICATION OF THE SCIURIDiE. 



213 



facts, Tail berg's statement that the North American species 

 Tamiascmrus hudsonicus, always regarded as closely akin to the 

 other Squirrels of that country and as ranking merely as a sub- 

 genus of SciuTus, has an elongated apically attenuated glans penis 



Text-figure 18. 



A. Glans penis of Sciiirus vulgaris. 



B. The same of Tamiasciurtis hudsonicus. 



C. The same, of Funamhuhis pahnarum. 



D. The same of Tamiodes tristriatus. 



E. The same of Calloscitn'ws prevosti. 



F. Penis of the same, with baculum attached, showing position of blade. 



G. Glans penis of Callosciurus notatus. 



H. Apex of same from right side, showing orifice. 

 K, L .The same of Tomeutes vittattis from right side, above, and left side. 

 o. Orifice. 



without a baculum, appeared to me to be so remarkable and 

 contrary to all expectations that I wrote to Mr. Gerrit S. Miller, 

 of the Smithsonian Institution, Washington, to ask if he would 

 be good enough to verify the statement for me. In reply, he very 

 Proc. Zool. Soc— 1923, No. XY. 15 



