100 CONTRIBUTIONS TO THE NATURAL HISTORY OF ALASKA. 



A fourth lateral line begins just beneath the in gill covers, passes between the abdominal fins, 

 and contains 48 scales; it then bifurcates at a line beneath half the length of the ventral fin, then 

 diverges to arch over the anus, passes a straight line of five scales above the anal fin to termin- 

 ate at the insertion of the inferior caudal ray, and contains 151 scales from its bifurcation to 

 caudal ray. 



The number of lateral lines varies, as does also their relative position on the side of the fish; 

 however, the number of lateral lines is never less than three, the absent one being the second one from 

 above. The greater percentage of males have four lateral lines, while some of the females have 

 but three. 



The intestine is about twice the length of the fish less the tail. 



The milt of the male is waxy white and of firm consistence in the fresh specimens. The 

 females have the roe disposed in two folds about six inches long and an inch in diameter, tapering 

 at both ends. The eggs of the female when matured for spawning are about the size of a number 

 twelve shot, and have a dark grayish spot on one side of them. 



At Attn I saw a small specimen of this species on October 11th. I thought it to be a fish of the 

 preceding year, as it was about two inches long and too large to have been of that year's spawn, 

 unless they grow very rapidly. 



UMBRIDiE. 



m 82. Dallia pectoralis Bean. (See Fig. IX.) 



A new genus has been established for this fish by Dr. T. H. Bean,* of the U. S. Fish Commission, 

 and dedicated to Mr. W. H. Dall, of the United States Coast Survey, in appreciation of his 

 contributions to the zoology of Alaska. 



The generic characters are as follows : Dallia, gen. nov. Umbridce ? 



Body oblong, covered with cycloid scales of small size with radiated stripe ; lateral line not 

 conspicuous; eye smaller than Umbra; cleft of the mouth of moderate width. Ventrals inserted 

 in front of the beginning of the dorsal, composed of three rays. Basis of anal as long as, or longer 

 than, that of dorsal. Caudal fin rounded and many rayed. Villiform teeth on the intermaxillaries, 

 the mandible, the vomer, and the palatines. Pectoral rounded and many-rayed. 



Dallia pectoralis, sp. nov., Bean. 



B. VII-VIII ; D. 12-14 ; A. 14-16 ; V. 3 ; P. 33-36 ; C. 30-33. 



The height of the body is contained four to four and one-half times in its length without 

 caudal; length of head four and one-fourth to four and one-half times. The eye is one-seventh to 

 one-sixth as large as the head. The pectoral is one-half as long as the head to end of upper jaw, 

 tha ventrals one-third as long. The origin of the dorsal is twice as far from the end of the 

 snout as from the origin of the middle caudal rays. The longest dorsal rays are a little more 

 than half the length of the head. The anal begins almost direct^' under the origin of the dorsal 

 and has nearly the same extent ; its longest rays equal or slightly exceed the longest dorsal rays. 

 The ventrals originate in advance of the dorsal, and can be made to reach to or slightly beyond 

 the origin of the anal. The vent is immediately in front of the beginning of the anal. About 77 

 scales in lateral line ; eleven rows of scales between the dorsal and the lateral line, and eleven 

 rows between the lateral line and the anal. 



Color. — Dusky brown mottled with whitish, all the fins similarly colored, the dusky spots some- 

 times becoming confluent on the caudal and simulating bands; belly mainly whitish, but in some 

 specimens thickly covered with small dusky spots. 



LIST OF SPECIMENS. 



23498 a-g. (collector's number, 1430) 7 specimens. Saint Michael's, Alaska, February, 1877. L. M. Turner. 

 23498 a. D. 13 ; A. 16 ; V. 3 ; P. 36 ; C. 33 ; B. 8. Length 205"™. 



*The description, as given above, together -with the ray formula?, was taken from Proceedings of the U. S. National 

 Museum, volume 2, pages 358-9, of Descriptions of some genera and species of Alaskan fishes, by Dr. Tarleton H. 

 Bean. 



