128 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



near York Factory. As the last species lias figured among the doubt- 

 ful ones in our lists of East Coast fishes, I give a somewhat detailed de- 

 scription of it. 



2777G. Percopsis guttatus Ag. 



27777. Stizostethium vitreumI = {Liwioperca americana Cuv.) 

 The example is very young and entirely without scales, but the species 



is most probably vitrcum. 



27778. Gasterosteus pungitius L. = {Pijgosteiis occidentalis [C. & Y.] 

 Brev.). 



This is the form described as G. nehulosus by Agassiz. It does not 

 differ from marine 2)ungitius except in its fresh-water habits. 



27770. Gasterosteus aculeatus var. gy:\inurus Cuv. 



The few scaly ])lates on the anterior part of the body are present, but 

 rudimentary. 



27780. CoTTus LAERADORicus (Girard). 



Taken near York Factory, Hudson's Bay, by Eobert Bell, M. D., As- 

 sistant Director of the Geological Survey of Canada, 1880. 



Br. yi; D. X, 14; A. U;Y.i,S; P. 17 ; C. 11 (developed). 



Two small spines above the snout ; a rough irregular prominence 

 above each orbit and two similar ones on the occiput. The slight de- 

 j)ression on the crown becomes narrower x^osteriorly where its wddth is 

 about one-half the length of the space included between the supraorbital 

 and occipital prominences. Four preopercular spines, two of which are 

 at the angle 5 the uj)i)ermost and longest is two-thirds as long as the 

 eye, but the spine is slightly imperfect ; the two lower spines are short 

 and extend downward and slightly forward. The length of the longest 

 preopercular spine equals the distance between the eyes measured on 

 the bone. The long diameter of the eye is one-fifth of the length of 

 the side of the head, and nearly equal to the length of the snout. The 

 maxilla is twice as long as the eye, about half as long as the head to 

 the end of the oj)ercular spine, and extends to about the vertical through 

 the hind margin of the eye. Teeth on the vomer, none on the pala- 

 tines. The dorsal spines are slender; the first is twice as long as the 

 distance between the eyes; the third and longest is five-sixths as long- 

 as the maxilla and one-half as long as the distance from the tip of the 

 snout to the end of the occipital prominences. The length of the 

 spinous dorsal base is one-fourth of the total length without caudal. 

 The interval between the spinous and soft dorsals is one-half as long as 

 the eye. The longest ray of the soft dorsal (9th) is about as long as 

 the middle caudal rays, or one-sixth of the total length with caudal. 

 The pectorals reach a little beyond the origin of the anal (to the second 

 ray of the anal) ; the ventrals are as long as the postorbital j^art of 

 the head and do not reach near the vent. Skin above the lateral line 



