1905.] NATURAL SCIENCES OF PHILADELPHIA. 365 



is 18 inches in length. The examples examined by Dr. Scofield, and 

 those before me, are all smaller, and thus the number of gill-rakers 

 in the original account (26) may be due to age. Dr. Scofield's 

 range from 18 to 22,^ while my specimens show 21 to 23. The scales 

 on the type of Coregonus nelsonii are given as 88. This may be veri- 

 fied as a lateral count by consulting Mr. Nelson's figure,'' though it is 

 evident that the last 3 or 4 are on the base of the caudal. 



As suggested by Dr. Boulenger, Coregonus richardsonii Giinther^ 

 would appear to agree best with C. nelsonii, and in view of our present 

 knowledge, the discrepancies in the lateral line and gill-rakers may 

 now be accounted for. I hesitate, however, to unite these species 

 until Dr. Giinther's examples are more carefully studied, aside from the 

 absence of locality. 



Argyrosomus pusillus (Bean). 



Head 4f ; depth 4|; D. iii, 9, i; A. ii, 11, i; scales 84 in lateral 

 line to base of caudal and 3 more on latter; snout 4^ in head; eye 4^; 

 maxillary 3; interorbital space 3|-; least depth of caudal peduncle 

 2^. Gill-rakers 16 + 28. Length of head from occiput to tip of 

 snout a little less than half of distance from occiput to origin of 

 dorsal. Length 12f inches. Meade river. November, 1897. 



Only one example which agrees with Dr. Smith's figure,^ especially 

 in the dark or brownish spots. These are also distinct on the dorsal. 



THYMALLID^. 

 ThymalluB signifer (Richardson). 



Dr. Horace Jayne kindly forwarded the following of Mr. Macll- 

 henny's notes concerning this species. These refer to a large exam- 

 ple taken in the Meade river, October 9, 1897. ''Entire dorsum 

 dark bronze-purplish, gradually fading on sides to lighter bronze 

 toward ventral side and chest to plumbeous-white on abdomen. 

 Two rusty stripes beginning just below bases of pectorals extending 

 to bases of ventrals sharply separate the white area of abdomen 

 from bronze of sides. Tail, anal and pectorals bluish. Ventrals 

 with six or seven nearly perfect longitudinal reddish-brown streaks. 

 An irregular patch of dark spots extends from angle of opercles and 

 pectorals back till about opposite base of ventrals, sometimes nearly 

 absent. Membranes of dorsal bluish, rays light brown. Mem- 



' Fur Seals N. Pac. (Fish. Arct. Alask.), Ill, 1899, p. 494. 



* Rep. Nat. Hist. Coll. Alaska, III, 1887, p. 314, PI. 20. 

 5 Cat. Fish Brit. Mus., VI, 1866, p. 185. 



• Rep. U. S. Fish Comm., XX, 1894 (1896), p. 312, PI. 23. 



