PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 21 

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



GENUS. 



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

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

 1873, p. 3G0. 



species. 



Giyptocephalua cynoglossus (Linn6) Gill. 



Fleuronectes oculis a dextris iotus glaber, Artedi, Gen. 14, N. 3; Mas. IchtL. No. 

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



Fleuronectes cynoglossus, Linn:6, Syst. Nat. ed. x, i, 1758, p. 269; ed. xii, 17C6, i, 

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



Glyptocephalus cynoglossus, Gill, Proc. Acad. Nat. Sci. Phila. 1873, p. 301. 



Fleuronectes pol a, LACEPi:DE, Hist. Nat. Poiss. (Suites ilBuffon), 1819, iv, p. 401. 



Flatessa 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. 



Fleuronectes saxicola, FiUjer, Isis, 1828, p. 877. 



Glyptocephalus saxicola, Gottsche, I. c. 



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



Flatessa elongata, Yarrell, op. cit. p. 318. — GCnther, o]). cit. p. 450.— CouCH, 

 op. cit. p. 193. 



Glyptocephalus elongatus. Gill, ojj. cit. p. 362. 



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

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



Dr. GUather suggests that the fish first cited by Fabricius {Fauna 

 Groenlandica, p. 163), under the name of Fleuronectes cynoglosstis, and 

 subsequently named by him Fleuronectes p'mguis (Af handling. Kongel. 

 Danske Videuskabernes 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. Is'at. 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 : — 



