742 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



snout is .24ii; the length of the operculum is .2^^, the diameter of the 

 orbit is .25f . 



Br., 9; D., 22 ; A., 3-11; C, G-19-7; P., 10 ; V., 10; scales in lateral 

 line, 95 ; transverse rows of scales above lateral line, 8 ; below lateral 

 line, lO-a ; Cciecal appendages, 18. 



The height of the body is greater than in the other American species ; 

 the length of the head is greater than that of T. slgnifer. Tlie «listance 

 from the snout to the dorsal is greater than in the latter si)ecies and 

 slightly less than in T. tricolor. The furcation of the cnndal is less than 

 in T. tricolor ; the adipose fin is more slender in form ; the head is 

 thicker; the length of the maxillary is less, as is also the diameter of 

 the orbit. 



Teeth are present on the premaxillaries, maxillaries, vomer, palatines, 

 mandible, and pharyngeals, and a group of seven or eight are found 

 upon the tongue. 



The scales to some extent assnn^e the linear arrangement characteriz- 

 ing T. vulgaris and not discernible in T. tricolor. The scales in the tho- 

 racic region are slightly smnller than in the latter species. A small 

 naked space is to be seen on the branchial isthmus. 



Length, 11.75 inches. 



National Museum, No. 13090. Locality, Oarap Baker, tributary of 

 the Missouri River, Montana Territory. Collector, J. Scott Oldmixon, 

 acting assistant surgeon. United States Army. 



MATERIAL. 



ThyDuiUvs ?u??/7«WsNilss. — One specimen, 10 inches long, presented by 

 H. Denny, Leeds, England ; two specimens, 12f inches in length, from 

 Eudolph Hessel, Offenberg, Germany. 



Thymalliis signifer Eich. — One specimen, — carefullj -stuffed skin, in ex- 

 cellent condition, — 17i inches long, from B. B. Boss, Hudson Bay Com- 

 panv's factor, Fort Sinipsou, B. A.; one specimen, Ih inches long, in 

 alcohol, from same locality and collector ; three specimens, alcoholic, 

 in bad condition, from Yukon Eiver, Alaska, W. H. Ball ; two si)eci- 

 mens, — diflVring slightly from the others, — labeled "St. Michael's(?), 

 Norton Sonnd, Alaska, H. M. Bannister." 



ThymaUus tricolor Cope. — Seventy-tive specimens from Au Sable 

 Biver, Micliigan, from C to 11 inches in length ; collected by D. H. Fitz- 

 liugh, jr., and James W. Milner. 



Thyviallus montamis, sp. nov. — Three specimens, collected for Smith- 

 sonian Institution, at solicitation of Surgeon J. F. Head, U. S. A., by 

 Acting Assistant Surgeon George Scott Oldmixon, Camp Baker, Mon- 

 tana Territory ; three specimens, (arrived in bad condition,) collected by 

 •C. A. Hart, acting assistant surgeon United States Army, at the request 

 of Surgeon J. F. Head, from Fort Shaw, Montana Territory ; three speci- 

 mens, collected by Dr. F. V. Hayden, United States geologist, at Willow 

 Creek, headwaters of Missouri Biver, Montana Territory. 



