FISHES OF ARCTIC ALASKA. 



495 



River. Our specimeus show quite a, rauge of variatiou in the number of gill rakers 

 and fin rays, given in the accompanying table. One of the specimens from the mouth 

 of the Mackenzie is the only one that shows perfectly tlie black markings on the 

 dorsal, as given in the figure of a similar sea-run individual from northern Alaska. 

 ( Whitefishes of America. Report of U. S. Commissioner of Fish and Fisheries, 1894. 

 Plate 23; also same plate in Cruise of steamer Corwin.) In addition to this it has a 

 few small, round black spots on top of the head and four or five similar spots on 

 adipose fin. All of the specimens have the articulation of mandible on a vertical with 

 center of eye. The diameter of eye equals the interorbital width and is greater than 

 length of snout. 



Locality. 



Length. 



Gill rak- 

 ers on 

 left side. 



Gill rak- 

 ers on 

 riglitside. 



Dorsal. 



Anal. 



Scales. 





Inches. 

 6 

 

 6 

 6 

 C 

 6 

 6 

 6 

 134 



16+31 



17+32 



17+31 



17 + 31 



17+30 



17+28 



14 



16 



14+27 



17 + 29 



11+25 



14 + 25 



16+32 



18+32 



17 



17+30 



17+30 



10 + 28 



14+29 



15 + 28 



14+28 



10 + 28 



12+25 



14+26 



11 

 11 



11 

 10 

 10 

 12 

 12 

 11 

 10 

 10 

 13 

 11 



13 



la 



14 

 14 

 13 

 14 

 12 

 12 

 11 

 13 

 12 

 12 



92 



83 

 93 

 84 

 85 

 90 

 84 

 91 

 83 

 (183 

 89 

 90 



Do .'.. 



Do 



Do 



Do 



Do 



Do ... ... 



Do . .. 



Barter Island . .... 



Do .. 



Nualiaiijali Kiver, Ala.slia (A.lbcit.t'oss coll.).. 





Naknek River, Bristol Buy (Albatross coll.) 







oNo. 46. 



5. Argyrosomus lucidus (Richardson). 



We obtained two specimens of this species in salt water off Herschel Island. 

 They are undoubtedly identical with the species found in Great Bear Lake and River. 

 We have compared them with two specimens from Great Bear River. One of our 

 specimens has a larger number of scales than the other, but it is not a larger varia- 

 tiou than may be expected within a species of this family. 



Besides the fin formula we give a few measurements not included in Jordan and 

 Evermann's otherwise full description: Longest dorsal ray, 1^ in head; longest anal 

 ray, 2^ in head; pectorals reach less than halfway to origin of ventrals, or IJ in head; 

 ventrals reach less than halfway to vent, or 1§ in head ; ventral scale a little over 

 half length of tin; articulation of mandible with quadrate bone on a vertical with 

 posterior margin of eye. Length of each specimen, 16 inches. 



Nnm- 

 ber. 



Dorsal. 



Anal. 



Ven- 

 tral. 



Gill 

 rakers. 



Scales. 



Transverse 

 rows of 

 scales be- 

 low dorsal. 



64 



67 



13 



11 



13 

 12 



12 

 12 



16+26 

 15+26 



10 87 10 

 10 98 10 



14 

 16 



6. Argyrosomus alascanus Scofield, new species. (Plate XLII. ) 



Head, 4^ ; depth, about 4 ; dorsal, 12; anal, 12 ; scales, 10, 85, 9. Eye a little shorter 

 than snout, 5 in head, I4 in interorbital space. Head wedge-shaped, the upper and 

 lower profiles straight and meeting with a sharp angle at the snout. Viewed from 

 above the snout is blunt, almost square, with the narrow, pale, rounded tip of the 



