424 EXPLORATIONS ACROSS THE GREAT BASIN OF UTAH. 



The maxillary barbels are slender and scarcely attain to the bases of th< 



The nasal barbelsYxtend slightly behind the eyes. The inframaxillarv art 

 On a curved line parallel with the jaw; the internal are much more distant from 

 than tla.se of one side: the external are about a tenth of the total len U th ; tl 



There are nine branchiostegal rays concealed in a very thick membrane. The 

 bottom of the sinus of the membrane' is very near the mental, the fold being nearly 

 at the end of the third fourth of the distance between the lower jaw and the sinus. 



The dorsal tin commences at the beginning of the third tenth of the distance from 

 the snout to the end of the caudal fin. Its length equals a tenth of the length, and is 

 little less long than high. The spine is small and simple, and its length scarcely equal 

 half that of the fin. 



and end of caudal tin. Its length is not quite e, 

 it rapidly increases in height toward the middle, wl 



id the end of the fourth tenth of the length; each 



is the length n( the longest 



number and arrangement ot the rays is expressed by the following formula: 

 D.L6. !: A. 4. 11. |; C. 23. 7. 12. 11: P. I. 10; V. 1.8. 



color of the single ill-preserved specimen is an olivaceous-brown, light he- 

 ld with the tins not margined bv a darker color. 

 * species of Xotunis was collected bv Dr. Suckley in the Platte River. It is 



