542 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



culate. Scales small, cycloid, deciduous. Caudal finely scaly over 

 greater portion from base. Pyloric coeca 14. Vent near last iBftli 

 of body without caudal. Dorsal length half of body without caudal. 

 Pectorals longer than ventrals, latter less than half of head and in- 

 serted midway between gill opening and anal origin. 

 One species. 



PTEROTHRISSUS GISSU Hilgendorf 



Pterothrissus gissu Hilgendorf, Act. Soc. Leopolidina Carol., pt. 13, p. 127, 1877 

 (type locality: ofE Tokyo). — Jordan and Snyder, Proc. U. S. Nat. Mus., 

 vol. 23, p. 349 (Tokyo), p. 743, 1900 (Hakodate).— Jordan and Snyder, 

 Annot. Zool. Japon., vol. 3, p. 52, 1901 (reference). — Jordan and Starks, 

 Bull. U. S. Fish Comm., vol. 22, p. 578, 1902 (Matsushima and Suruga 

 Bay).— Jordan and Herre, Proc. U. S. Nat. Mus., vol. 31, p. 618, 1906 

 (Suruga Bay, Matsushima Bay, Tsuruga Straits, Hakodate). — Franz, Abh. 

 Bayer. Akad. Wiss., vol. 4, suppl. vol. 1, p. 4, 1910 (Aburatsubo). — Snydbk, 

 Proc. U. S. Nat. Mus., vol. 42, p. 402, 1912 (Tokyo market).— Jordan and 

 Hubbs, Mem. Carnegie Mus., vol. 10, p. 119, 1925 (Sliizuka and Yokohama 

 markets). — Schmidt, Trans. Pacific Comm. Acad. Sci. U.S.S.R., vol. 11, 

 p. 17, 1931 (Tokyo).— Tanaka, Jap. Fish. Life Colours, No. 40, 1933. 



Bathythrissa dorsalis GtJNTHEE, Ann. Mag. Nat. Hist, ser. 4, vol. 20, p. 443, 

 1877 (type locality: off Inosima, Japan); Rep. Voy. Challenger, vol. 22, 

 p. 222, pi. 56, fig. A, 1887 (type, from 345 fathoms depth). 



Depth 5 to 71/2 ; head 31/2 to 4, width 2 to 32/5. Snout 2% to 3 in 

 head; eye 3 to 4l^, 1 to 1% in snout, greater than interorbital ; 

 maxillary reaches % to ^ to eye, expansion 2 to 2% in eye, length 

 31/4 to 4% in head ; teeth fine, conic, short, in rather broad bands in 

 jaws; palate edentulous; interorbital 4% to 5%? I0W5 medianly de- 

 pressed. Gill rakers 3 + 11, short, spinescent tubercles, Vs of giU 

 filaments which % in eye. 



Scales 100 to 104 in lateral line to caudal base and 9 or 10 more 

 on latter; 8 or 9 above, 6 or 7 below, 20 to 22 predorsal. Scales with 

 7 basal radiating striae; circuli fine, none apical. 



D. in to V, 51, I to 53, i, first branched ray 2i/io to 2% in head ; 

 A. Ill, 9, I, first branched ray 23/4 to 3^8 ; caudal 1% to 1%, deeply 

 forked, lobes broad ; least depth of caudal peduncle 4 to 4% ; pectoral 

 1% to 134 ; ventral 21/3 to 21/2. 



Brownish above, below silvery minutely dotted with brown. Al- 

 coholic specimens only paler below as scales have fallen. 



Coasts of Japan, in deep water. Giinther's fish was only 384 mm. 

 in length. 



U.S.N.M. No. 51414. Matsushima, Japan. Albatross collection. Length, 74-95 



mm. 5 examples. 

 U.S.N.M. No. 51449. Matsushima, Japan. Albatross collection. June 5, 1900. 



Length, 175-249 mm. 4 examples. 

 U.S.N.M. No. 57548. Tsushima, Japan. P. L. Jouy. Length, 366 mm. 

 U.S.N.M. No. 61664. Tokyo. Bureau of Fisheries (2353). Length, 490 mm, 

 U.S.N.M. No. 71378. Tokyo market. Bureau of Fisheries. Length, 473 mm. 



