128 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



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

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

 scription of it. 



2777G. Percopsis guttatus Ag."" 



27777. Stizostethium vitreum? = {TAicioperca americana Cuv.) 

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



is most probably vltrcum. 



27778. GaSterosteus pungitius L. = {Pygosteus occidentalis [C. & Y.] 

 Brev.). 



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

 differ from marine pungitius except in its fresh-water habits. 



27770. Gasterosteus aculeatus var. gymnurus Cuv. 



The few scaly plates on the anterior part of the body are present, but 

 rudimentary. 



27780. COTTUS LABRADORicus (Girard). 



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

 sistant Director of the Geological Survey of Canada, 1880. 



Br. vi; D. X, 14; A. 14; Y. i, 3; 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- 

 pression on the crown becomes narrower posteriorly where its width is 

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

 and occipital i)rominences. Four preoperctdar spines, two of which are 

 at the angle; the uppermost and longest is two-thirds as long as the 

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

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

 ])reopercular 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 opercular spine, and extends to about the vertical through 

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

 tnies. 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 ouelourth 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 (9tli) 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 part of 

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



