DESCRIPTION OF A NEW SPECIES OF DEEP-WATER SCUL- 

 PIN (TRIGLOPSIS ONTAKIENSIS) FROM LAKE ONTARIO, 

 WITH NOTES ON RELATED SPECIES. 



By David Starr Jordan and William Francis Thompson, 



Of Stanford University, California. 



In the work of the International Fisheries Commission on Lake 

 Ontario, Dr. Seth Eugene Meek, acting as assistant to the commis- 

 sion, secured a fine specimen of a species of sculpin from deep water 

 off Toronto. 



This specimen belongs to the genus Triglopsis of Girard, the fresh- 

 water representative of the marine genus Oncocottus, and it is pre- 

 sumably descended from species of the latter genus left in the Great 

 Lakes on their elevation from the sea. 



This specimen, which is in very perfect condition, may be described 

 as follows: 



TRIGLOPSIS ONTARIENSIS Jordan and Thompson; new species. 



One specimen, No. 64599 U.S.N.M., 12S mm. long, taken in deep 

 water off Toronto by Dr. Seth Eugene Meek. 



Head 3| in length to base of caudal; depth 4J; width at base of 

 pectorals 4; orbit 5 in head; interorbital space 5£; depth of caudal 

 peduncle equal to interorbital space, its length 2 in head: height of 

 first dorsal twice in width of body at pectorals, of second dorsal twice 

 that of first; dorsal rays IX-1 5; anal 14; pectoral 16. 



Body broad, head depressed, cylindrical from pectorals to caudal 

 peduncle, which is slightly compressed. Head long, broad; snout 

 moderate, Sh in head; gape wide; interorbital space broad, concave; 

 maxillaries extending to below posterior margin of eyes; eyes large; 

 gill membranes attached to isthmus very narrowly, almosl forming a 

 fold across; a short slit behind fourth gill; a shorl spine above each 

 orbit, one on each side of median line at occiput ; four blunt ones on 

 preoperculum, of which the dorsal and largest points upward and 

 backward, the ventral downward, the others pointing backward and 

 downward; none curved or hooked; one on operculum at lower angle. 



Proceedings U. S. National Museum, Vol. 38, No. 1728. 



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