PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 21 



The synonymy of the genus and species stands somewhat as follows : — 



GENUS. 



Giyptocephalus, Gottsche, Archiv fiir Naturg. i, 1835, p. 156.— Bleecker, Compt. 



Rend. Acad. Sci. Amsterdam, xiii. — Gill, Proc. Acad. Nat. Sci. Phila. 

 1873, p. 360. 



SPECIES. 



Giyptocephalus cynoglossus (Linn6) Gill. 



Pleuronectes oculis a dextris totus glaber, Artedi, Gen. 14, N. 3; Mas. Ichth. No. 



39; Synon. p. 31, N. 3. 

 Pleuronectes cynoglossus, Linne, Syst. Nat. ed. x, i, 1758, p. 269; ed. xii, 1766, i, 



p. 456. — Gunther, Cat. Fish. Brit. Mus. iv, 1862, p. 449. 

 Giyptocephalus cynoglossus, Gill, Proc. Acad. Nat. Sci. Phila. 1873, p. 361. 

 Pleuronectes pol a, Lacepede, Hist. Nat. Poiss. (Suites aBuffon), 1819, iv, p. 401. 

 Platessa pola, Cuvier.— Parnell, Nat. Hist. Fish. Frith of Forth, 1838, p. 210, 



pi. xxxviii. — Yarrell, Hist. Brit. Fish. 1841, ii, p. 315.— Couch, Fishes 



British Islands, iii, 1864, p. 190. 

 Pleuronectes saxicola, Faber, Isis, 1828, p. 877. 

 Giyptocephalus saxicola, Gottsche, I. c. 



Pleuronectes nigromanus, Nilsson, Prodr. Ichth. Scand. 1832, p. 55. 



Platessa elongata, Yarrell, op. cit. p. 318. — Gunther, op. cit. p. 450.— Couch, 



op. cit. p. 193. 

 Giyptocephalus elongatus, Gill, op. cit. p. 362. 



Giyptocephalus acadianus, Gill, op. cit. p. 361, and in Baird's Report on Fish- 

 eries of South Coast of New England, 1873, p. 794. 



Dr. Gunther suggests that the fish first cited by Fabricius (Fauna 

 Groenlandica, p. 163). under the name of Pleuronectes cynoglossus, and 

 subsequently named by him Pleuronectes pinguis (Af handling. Kongel. 

 Danske Videnskabernes Selskabs, Naturvid. og Math., Copenhagen, vol. 

 i, 1824, p. 45), is probably identical with this species. The true rela- 

 tions of the Greenland fish have already been pointed out by Professor 

 Gill (Proc. Acad. Nat. Sci. Phila. 1864, p. 218), as well as the curious 

 misapprehension by which the synonymy of P. pinguis and the halibut 

 has been confounded. 



The following tables give detailed measurements of twenty-three 

 specimens, and a list of all the specimens in the National Museum : — 



