EXPLORATIONS ACROSS THE GREAT BASIN OF UTAH. 

 AJflURUS OBESUS, Gill. 



i-conical in prol 



lie, and is above ovi 



il and depressed, and 



line from the d 



orsal iin to the snon 



t. From the snout to 



ivulum, it, form 



a a quarter of the 



extreme length. The 



i of the total le 





veen the cheeks, under 



odredths of the 



same. The intervs 



il between the borders 



] ;j^z 



dipose matter; the d 

 I; they are separated 



iameter of one is equal 

 [from the middle of the 



ire slender and 

 jxtend beyond 



extend little beyond 

 the posterior bord 



[ the bases of the pec- 



ers of the eyes. The 



I on a curved 



line parallel with tl 



le lower jaw. The ex- 



the internal, the 



■ former about equal 



the interval between 



deft the bases of 



' the two internal ex< 



?eeds by about a fourth 



the eyes- the distai 



ice between the bases of the two internal exceeds by about a fourth 



that between the in 



ternal and external of one side. 



The branehio. 



*egal rays are enveloped in a thick skin; there are nine, the two 



upper Of which are 



large and compressed. r l lie branchiostegal membrane is deeply 



excavated, and, as 



in all the Ictuhtri, when closed, or not expanded, appears anteriorly 



as a simple fissure 0] 



•fold: the mental fold is much nearer the bottom of the emargination 



than the jaw. Th< 



) membrane itself is attached for nearly half the distance between 



the fold ami the em 



argination. 



The dorsal fin 



commences scarcely behind the end of the first third of the length; 



its length nearly eq 



uals a twelfth of the length, as does also that of the spine: its height 





>f the length. 



The adipose fil 



i is semi-cordiform. 



The anal fin c< 



mimonees at the lifty-four Iiundredths part of the distance between 



the snout and end c 



►f caudal: its length equals a seventh of the total length, and its 



height less than a 1 

 decreases behind. 



hirteenth: it rapidly increases in height in front, and as rapidly 





ns are short, their length little exceeding a seventh of the total; the 



spine equals an ele> 



enth of the length, is moderately stout, externally edentulous, and 



internally toothed. 



The process of the coracoid bone is spiniform, and from the base of the pectoral 



spine equals seven ninths of its length. 



The ventral fins commence slightly behind the fourth tenth of the length; they 

 equal a seventh of the length. The third ray is the longest. 



The caudal tin, when expanded, appears to be truncated, and tonus fifteen hun- 

 dredths of the total length. 



D. I. 4}; A. 4. 13. J; C. 7. 1. 15. 1. 9; P. I. 8; V. 1. 7. 



