Jordan and Evermann. Fishes of North America. 47 L 



than half diameter of pupil. Supraorbital bone large, its width 2 to 2J 

 in its length. Gill rakers very long and slender, the longest slightly 

 more than length of eye, 16 + 28 in number in each specimen. Front 

 of dorsal slightly nearer tip of snout than base of upper rudimentary dor- 

 sal rays. The fins are mutilated, so that their length can not be given. 

 "Adipose fin large, inserted vertically above last anal rays, its height from 

 tip to posterior end of base equaling vertical diameter of eye. Color sil- 

 very. As pointed out by Dr. Giinther, this northern form differs from A. 

 arledi in its shorter head and smaller eye. It seems also to have the pre- 

 maxillaries placed at a greater angle than in A. artedi. Mackenzie River 

 and tributaries. Here described from two specimens from Great Bear 

 Lake River, each 16 inches long, collected by Miss Elizabeth Taylor. 

 (lucidus, shining.) 



Sahno (Coregomm) hicidus, RICHARDSON, Fauna Bor.-Amer.,m, 207, 1836, with good figure, Great 



Bear Lake. 

 Coregonus lucidus, Gl'NTHER, Cat., vr, 198, 1866 ; GILBERT, Bull. U. S. Fish Comm., xiv, 1894, 24. 



768. ARGYROSOMUS LAURETTA (Bean). 



Head 5; depth 4; eye 4| to 5. D. 12; A. 11; V. 12; scales 10-84 to 

 95-10, 84 to 87 in specimens examined. Body robust, the back elevated ; 

 head small and slender, the small eye not longer than snout. Distance 

 from nape to front of snout 2i times in its distance from dorsal. Maxil- 

 lary about reaching middle of eye, 3i in head, its supplemental bone half 

 its length; lower jaw very slightly longer than upper; mandible 2 in 

 head; lingual teeth present. Gill rakers long and numerous, 10 + 25; 

 ventral scale not half length of fin; pectorals short, not reaching half 

 way to ventrals. Scales smaller than in A. artedi, 16 cross series under 

 base of dorsal. Alaska, from Yukon River northward to Point Barrow; 

 generally common. Apparently very close to Argyrosomus lucidus, but the 

 base of the dorsal longer. (Named for Mrs. Lauretta H. Bean. ) 



Goregonuslaurettse, BEAN, Proc. U. S. Nat. Mus., 1881, 156, Point Barrow ; JORDAN & GILBERT 

 'Synopsis, 890, 1883. (Type, Nos. 27695 and 27915. Coll. Capt. C. L. Hooper.) 



769. ARGYROSOMUS PROGNATHUS (H. M. 'Smith). 

 (LONG JAW ; BLOATEU.) 



Head 4^; depth 3i to 4; eye 5. D. 9 or 10; A. 10 to 12. Eye rather 

 small, li in snout, 1^ in interorbital space, li in suborbital space. Scales 

 9-75-8. Body oblong, much compressed, back elevated, tapering rather 

 sharply towards the narrow caudal peduncle, the adult fish having a 

 slight nuchal hump as in C. clupeiformis. Mouth large and strong ; snout 

 straight, its tip on level with lower edge of pupil. Top of head 2 in 

 distance from occiput to front of dorsal. Maxillary reaching to opposite 

 pupil, 2| in head, the length 3| times its greatest width ; mandible project- 

 ing beyond upper jaw when mouth is closed, very long, reaching to or 



* The vertical from last ray of anal traverses the posterior third of base of adipose dorsal. This 

 is the only respect in which our specimens fail to agree with Richardson's description. The lat- 

 ter states that the adipose fin is located "about its own breadth posterior to the anal," but this 

 can probably be accounted for by the uaturo of the specimen, Kichardsou's description being 

 taken from a stuffed skin. Gilbert. 



