102 BOOK OF THE BLACK BASS. 



from which it is,* however, distinguished by the profile of the 

 more raised back, and of course by a broader body. The sur- 

 face of the skull is uniformly rounded and not depressed, as in 

 G. salmoides', the proportions of the head compared with the 

 body are the same as in this latter, but the mouth is less 

 opened, and the shorter labials do not reach a vertical line 

 drawn across the hinder margin of the orbits, whilst they exceed 

 such a line in 0. salmoides; the teeth are arranged like cards, 

 and are similar in both species. The fins upon the whole seem 

 to be cut on the same pattern as in G. salmoides, but when we 

 examine them attentively, we see that they are all stabbed like 

 the body itself; the ventrals and pectorals shorter and more 

 widened; the dorsal and anal lower. As for the other details 

 of their structure they are about the same, as we may see from 

 the following formula: 

 Br. 6; D. X, 14; A. Ill, 10; C. 7, 1, 8, 7, 1, 6 ; V. 1,5; P. 16. 



"The scales are a little smaller, but of the same form as in 

 G. salmoides; the radiating striae are perhaps less marked; they 

 cover the opercular apparatus and the cheeks, but at this latter 

 place their smaller size is quite remarkable ; this latter charac- 

 ter is very striking when we compare both species. 



"Our specimens are from Lake Huron ; one of them measures 

 twelve inches, and the other seven. I have also received two 

 specimens from Lake Michigan, through the- care of Mr. Samuel 

 C. Clarke, the largest of which measures eighteen inches. 

 Professor Baird forwarded to me specimens from Lake Champ- 

 lain. Dr. DeKay has found it in Lake Oneida. Finally, this 

 species extends to Pennsylvania, as I was able to convince 

 myself by two specimens collected at Toxburg, and for which 



* " Grystes scdmoneus does not occur in the Northern nor in the Middle 

 States, although Dr. DeKay mentions it upon the authority of Cuvier, who 

 probably mistook specimens of our Grystes fasciatus for the southern spe- 

 cies. Having, however, failed to discover this confusion, Dr. DeKay de- 

 scribes the same fish again, under the name of Ocntrarckus ohscurub." 

 (AGASSIZ, Lake Saperi&r, 295, 1850.) 



