ISOPONDYLI— SALMONIDAE— SALMO VIRGINALIS. 685 



SALMO VIRGINALIS, Gir. 



Salar virginalis, Gir., P. R. R. Rep., 1S59, Ichthyology, x, 320, pi. lxiii, figs. 1-4. — Id., 



Proc. Acad. Nat. Sci. Phila., viii, 1856, 220. 

 Salmo virginalis, Cope, U. S. Geol. Surv. Wyoming, 1870, 433. — Id., U. S. Geol. Surv. 



Montana, 1871, p. 460.-1(7., Proc. Am. Phil. Soc. Phila,, 1874, p. 130.— Id., 



Rep. Plagop. & Ichthy. Utah, 1874, 0. 



Description according to Grirard. 



Specific characters. — Body subfusiform in profile, otherwise com- 

 pressed; head comprised about four times in the total length; the caudal fin 

 excluded ; jaws subequal ; posterior extremity of maxillary extending to a 

 vertical line, intersecting the posterior rim of the orbit, Anterior margin of 

 dorsal nearer the extremity of the snout than the insertion of the caudal 

 fin. Grayish-brown, with a purplish reflection and subcircular black spots; 

 beneath olivaceous, unicolor. 



Br. 9: 9 ; D. 12 : ; A. 11 ; C. 7, 1, 9, 8, 1, 8 ; V. 8 ; P. 14. 



A comparison of specimens in the collection of the survey gives the 

 following result: 



Length of two specimens 14£ and 15.2 inches. Head enters total 

 ength, caudal fin included, about four and one-third times. Posterior 

 extremity of maxillary extends to and intersects a vertical line drawn one- 

 fifth of an inch in rear of posterior rim of orbit ; anterior margin of 

 dorsal nearer insertion of caudal than snout. Eye large, subcircular, 

 entering 8-7 times in greatest length of side of head, and over twice in 

 advance of anterior rim of orbit. Caudal five and two-thirds in total 

 length. Line vertical drawn from insertion of ventral reaches the sixth 

 spine -of dorsal ; 36-36 rows of scales above lateral line, 40-41 below. Br. 

 11-11; D.12; A. 12; C. 7-1-9-8-1-8; V. 9-9 ; P. 14-14. The characters 

 here given we find are constant in a number of specimens, and it may be 

 noticed some grave differences exist between our own and Girard's specific 

 characters. His general description of the species is good, however, and 

 leaves little to be desired. It. may be mentioned that the dark spots which 

 are found on the dorsal aspect of this species frequently run into the con- 

 junctiva of the eye; this fact as far as known has not been observed in other 

 species. 



