REPORT ON THE DEEP-SEA FISHES. 165 



Rhomhoidichthys, Blkr. 



This genus includes littoral species of tlie Tropical and Subtropical seas, and there is 

 also some uncertainty as to the depth at which the following species was obtained. 



Rhomboidichikys cornutus. 



Rhomhoidichthys cornutus, Giinth., Report on the Shore Fishes, Zool, ChalL Exp., pt. vi. p. 7, 



pi. ii. fig. B. 



Hahitat. — Coast of Brazil, Stations 122 to 122b; depth, 32 to 350 fathoms. One 

 specimen, 3^ inches long. 



Monolene. 



Monolene, Goode, Proc. U.S. Xat. Mus., vol. iii., 1881, p. 338. 



This genus seems to differ from Arnoglossus by having a narrower mouth, the 

 length of the maxillary being less than one-third of that of the head, by the total 

 absence of the pectoral fin on the blind side, and by feeble gill-rakers in small number. 



Monolene sessilicauda. 



Monolene sessilicauda, Goode, Proc. U.S. Nat. Mus., vol. iii., 1881, pp. 338, 472; Bull. Mus. 

 Comp. Zool., vol. X., 1883, p. 194. 



D. 99-103. A. 79-84. L. lat. 92 (?). 



Several specimens, from 4 to 6 inches long, were obtained by the U.S. Survey 

 steamers, in lat. 40° 0' N., long. 70° 22' W.; and in lat. 32° 31' N., long. 78° 44' 

 W.; at depths from 115 to 155 fathoms. 



Citharichthys, Blkr. 



The species of this genus are littoral forms, from the Tropical Atlantic and California, 

 but the following have descended to moderate depths within the same oceanic area. 



Citharichthys arctifrons. 



Citharichthys arctifrons, Goode, Proc. U.S. Nat. Mus., vol. iii., 1881, pp. 341, 472; BuE 



Mus. Comp. Zool., ser. 5, vol. x., 1843, p. 194. 



Numerous specimens, from 3| to 5^ inches long, were obtained by the U.S. Fish 

 Commission, at lat. 40° 0' N., long. 70° 23' W.; in from 86 to 155 fathoms; 

 and by the U.S. steamer " Blake," in the same area down to 197 fathoms. 



