602 GLEANINGS AMONG THE PLEUKONECTIDS 



Type T. rent ml is. 



The greatest height is about the end of the first third of the length, 

 and thence the declinature is regular toward the eye ; the seales are 

 mostly rounded or even subtruncate and rarely angulated behind, and 

 their marginal teeth very stout on the eyed side, but on the blind side 

 they are regularly cycloid. The faintuess of the lateral line on the 

 blind side, the posterior truncation of the supramaxillaries, and the 

 development of the pectorals and veutrals, especially in the males, 

 differentiate the genus from Arnoglossus. 



COMPARATIVE RELATIONS. 



The genera just described fall into the places below indicated in 

 Messrs. Jordan and Goss's synoptical scheme of the genera of Psettince. 

 The following table is essentially reproduced from the memoir, the 

 chief deviation being in the value given to the absence or presence of 

 the pectoral fin of the blind side and the character of the teeth, 

 whether well separated or crowded into villiform bauds. The devia- 

 tions are indicated by the italicized portions. The table is partially 

 artificial and confirmation or proper allocation of the several groups 

 awaits a comparative study of their anatomy. Monolene, not examined 

 by .Jordan and Goss, aud considered by them to be "of uncertain rela- 

 tionship," is related to the genera to which it is approximated, as I have 

 ascertained by a study of the types of both the species. 



ANALYTICAL TABLE OF PSETTINiE. 



a. Septum of gill cavity between gill arches aud the termination of the shoulder- 

 girdle with a large foramen ; the emargination 

 below the shoulder-girdle near the isthmus not 

 deep; lateral line with a strong arch in front; 

 last rays of dorsal and anal inserted more or 

 less on the right side of the median line ; teeth 

 subequal, in bands. 

 b. Vomer toothless ; ventral fins free from the anal ; caudal fin subsessile ; scales 



small, each with very long spi miles; vertebra 



(regins) 10+25=:55 Phkyxorhombus. 



bb. Vomer with teeth. 

 c. Ventral of eyed side united to the anal; scales small, very rough ; body ovate; 



vertebnr (punctatus) 12+25=37. 



Zeugopterus. 

 cc. Ventral (ins free from the anal; scales ciliated, deciduous; body obloug, much 



compressed; vertebra? (ichiff-iagonis) ll-f;50= 



41 LEPIDORHOMBUffl 



aa. Septum of gill cavity below gill arches, without foramen; a deep emargination 



nearer the isthmus; ventral fins free from anal. 

 d. Pectoral fin of both sides present ; dorsal rays less than 100. 

 e. Vomer with teeth ; lateral line with a strong arch in front. 



/. Body elongate; scales weakly ciliated; mouth very large; teeth 

 unequal, those of the upper jaw biserial, some 

 of them canine-like Eucitharus. 



