294 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [70] 



to the nominal genus Huchalarodus based on the males, while Liopsetta 

 was based on the smoother females, which were erroneously supposed 

 to be scaleless. 



The following analysis gives the supposed differential characters of 

 these species, but these characters are of very slight importance, and it 

 is probable that the three nominal species are all varieties of Liopsetta 

 glacialis. 



ANALYSIS OF SPECIES OF LIOPSETTA. 



a. [Ridge above operele ending in two obtuse tubercles; scales of blind side smooth, 

 those of the eyed side ciliated (probably in males only); interorbital ridge prom- 

 inent, acute; head, 4£ in total with caudal ; depth, 2§. D., 50 to 57; A.,3Gto41.] 

 (Lilljeborg) Dvinensis, 84. 



aa. Ridge above operele coarsely rugose, divided toward its end, but without distinct 

 -tubercles ; scales ctenoid on both sides in males, those of the blind side smoother. 

 b. Pectoral fin long, about half length of head in the females, two-thirds head in the 

 males. Head, 3£ ; depth, 2. D., 55; A., 40; Lat. 1., 70. Color, grayish brown, 

 mottled with darker; tins with blackish spots. (Probably identical with the 

 next) Putnami, 85. 



bb. Pectoral fin short, barely half length of head even in the males; head, 4; depth, 

 2 ; D., 56 ; A., 37 to 42. Vertebrae, 13+27=40. Color, dark brown, the fins spotted. 



Glacialis,* 86. 



84. LIOPSETTA DVINENSIS. 



Platessa dvinensis " Lilljeborg, Vet.-Akad. Handl., 1850, p. 360, tab. 20 " (mouth of 



River Dwina). Nilsson, " Skand. Fauna, iv, 617." 

 Pleuroneetes dvinensis Giinther, iv, 442 (copied). 



Habitat. — Arctic coasts of Eussia. 



This species is known to us only from the description copied by Giin- 

 ther from Lilljeborg. It is apparently a species very closely related to 

 Liopsetta glacialis, and it is most likely identical with the latter. 



85. LIOPSETTA PUTNAMI. 



(The Eel-back Flounder.) 

 [Plate XVI.] 



Platessa glabra Storer, Proc. Boston Soc. Nat. Hist., p. 130, 1843 (female). Storer, 

 Syn. Fish. N. A., p. 477, 1846. Storer, Hist. Fish. Mass., 1867, p. 199, pi. xxxi, 

 lig. 1. Putnam, Bull. Essex Inst., vi, 1874, p. 12 (not of Rathke, 1837). 



Liopsetta glabra Gill, Proc. Acad. Nat. Sci. Phila., 1864, p. 217. 



Pleuroneetes glaber Gill, in Report XL S. Com. Fish and Fisheries, 1873, p. 794. Goode 

 and Bean, Amer. Jour. Sci. and Arts, xiv, 1877, p. 476 ; xvii, 1879, p, 40. Goode 

 and Bean, Proc.U. S.Nat. Mus., 1878, 347 (Casco Bay, Beverly Bridge, Salem, 

 Biicksport, Me.). Jordau and Gilbert, Syn. Fish. N. A., 1882, p. 836. Goode, 

 Nat. Hist. Aquat. Anim., 1884, p. 183, pi. 45. 



Etiehalarodus putnami Gill, Proc. Acad. Nat. Sci. Phil., 1864, p. 216-221 (Salem, 

 Mass.; male. Gill, Report U. S. Com. Fish and Fisheries, 1873, p. 794. Goode 

 and Beau, Amer. Jour. Arts and Sci., xiv, 1877. 



Habitat. — Atlantic coast of iNorth America, from Cape Cod north- 

 ward to Labrador and beyond. 



* The pharyngeals in dvinensis and glacialis have not been examined. 



