Jorda)i and EveniuDDi. — Fishes of N'orth America. 2005 



740. TRIGLOPSIS, Girard. 



Triglopsis, GiEABD, Proc. Bost. Soc. Nat. Hist., IV, 1851, 18 (thompsoni) . 

 Ptyonotus, Gunther, Cat., ii, 175, 1860 (thompsoni; substitute for Triglopsis on account of 

 the p'rior and similar name, Triglops). 



Body and liead sleDder. Skin naked; lateral line chain-like. Teeth on 

 vomer, none on the palatines. Eyes large, the interorbital area concave; 

 hones of lower part of head extensively cavernous; a. small but distinct 

 slit behind last gill ; gill membranes almost free from the isthmus, forming 

 a broad fold across it ; preopercular spines straight, simple, 4 in number^ 

 the lower turned downward ; fins large. Fresh-water fishes, closely related 

 to Oncoeottus, from which they have doubtless become degraded through 

 fresh-water life. There is no tangiljle ditference in structure in any j)art 

 of the body. {zpiyXa, Trigla; oipig, appearance.) 



2374. TRIGLOPSIS THOMPSOM, Girard. 



Head 3; depth 6. D. YII, 18; A. 15; V. I, 3. Body elongate, very slen- 

 der. Head long, depressed above; snout long and pointed; eye quite 

 large, nearly as long as snout, much wider than interorbital space, 4 in 

 head ; jaws subequal ; mouth large, the maxillary extending rather beyond 

 middle of eye; preoperclc with 4 sharp spines, the upper much shorter 

 than pupil; cavernous structure of skull highly developed; upper surface 

 of head smooth; gill membranes not broadly united, nearly free from 

 isthmus. Dorsal fins well separated; spinous dorsal short and low, its 

 height little more than length of snout; second dorsal very large, 3 times 

 height of first, its longest rays about as long as head; anal high, ^ as 

 high as second dorsal; pectoral long, reaching past front of anal; ven- 

 trals well developed ; lateral line chain-like, conspicuous; skin perfectly 

 smooth. Pale olivaceous, with darker blotches ; upper fins faintly banded. 

 Length 3 inches. Deep waters of the Great Lakes; not common; known 

 from Lake Michigan and Lake Ontario ; doubtless a relic of a former Arctic 

 marine fauna, and descended from a species of Oncoeottus. (Named for 

 Rev. Zadock Thompson, the accomplised author of the History of Vermont. ) 



Triglopsis thompsoni, GmARD, Proc. Bost. Soc. Nat. Hist., iv, 1851, 19, off Oswego, Lake 

 Ontario (Coll. S. F. Baird) ; GiEAED, Monograph Cottoids, 65; Jobdan <fc Gilbert, 

 Synopsis, 709, 1883. 



Triglopsis stimpsoni. Hoy, Trans. Wis. Ac. Sci. 1872, 98, Lake Michigan. (Coll. Dr. Wil- 

 liam Stimpson.) 



Ptyonotus thompsonii, GOntheb, Cat., ii, 175,1860. 



the eye, about J as long as the head to the end of the opercular spine, and extends about 

 to the vertical tlirough the hind margin of the eye. Teeth on the vomer, none on the 

 palatines. Dorsal spines slender ; the tirst twice as long as distance between eyes ; third 

 and longest | as long as maxillary and J a.s long as distance from tip of snout to end of 

 occipital prominences. Base of spinovis dorsal J total length without caudal; distance 

 between dorsals 2 in eye. Longest soft dorsal ray (ninth) about as long as middle cau- 

 dal rays, or J total length with caudal; pectorals reaching a little beyond origin of anal 

 (to second ray of anal) ; ventrals as long as postorbital part of head and not reaching 

 vent. Skin above the lateral line with a few spiny tubercles, none of them more than % 

 as long as eye. A .small slit beliind fourth gill. Coast of Labrador and Hudson Bay. 

 This description by Dr. Bean from specimens taken in 1880 near York Factory, Hudson 

 Bay, by Robert Bell, M. D. This nominal species is apparently the female of Oncoeottus 

 hexaconds. 



