NO. 130S. HEMIBRANCHIA TE FISHES— JORDAN AND ST. 1 IlKS. fi 1 



2. PYGOSTEUS Brevoort. 



Pi/i/osteKs (BrevDDi-t ) (iir.L, Cat. Fislies Vjns~t Coa,«t Nortli America, ISfil, p. 39; 



name only. 

 Pyi/oxtcH.t (\\iA., Canadian Naturalist, II, 18()5, j'- ^ {occidentalis) . 

 Gafiterostea Sxvx AGE, Revision des Epinoches, 1874, ]>. 29 { jyungltins) . 



This genu.s is characterizod l)y the presence of 9 to 11 divergent 

 spines and by the weakness of its innominate bones. The gill mem- 

 branes form a l)road fold across the isthmus. Vertebrai 14 + 18 = 32. 



(jtvyr}^ pubic region; ocrreov^ bone.) 



((. Dorsal with 8 spines Me'mddchiieri, 2. 



aa. Dorsal with 11 or 12 spines undecimalis, 3. 



2. PYGOSTEUS STEINDACHNERI Jordan and Snyder. 



Gaslewsteus japonicus Steindachner, Ichthy. Beitr., IX, i). 27, pi. lu, tig. 2; 



Gulf of Strielok, near Vladivostok. (Not of Houttuyn. ) 

 Pi/gosteu~s steindachneri Jordan and Snyder, Proceedings TJ. S. Nat. Mus., 1901, 



p. 747, after Steindachner. 

 Gdntnostevs ^/«j(//i7(«s Ishikawa, Prel. Cat., 1897, yi. 59; Lake Inokashiro, near 



Tokyo. 

 Gio^terostens i^Y*. xshikawa, Prel. Cat., 1897, p. 59; Yamashiro. 



The following description is taken from 4 specimens from Yama- 

 shiro: 



Head 3f in length; depth 4i. Dorsal VllI-11; anal 1-8, or 9. 

 Diameter of eye equal to snout or slightly greater, contained 3^ times 

 in head; width of interorbital two-thirds diameter of eye; maxillary 

 barely reaching to under anterior adge of the eye in the males, 

 slightly shorter in the females. 



Length of ventral spines equal to distance from tip of snout to 

 middle of eye; length of middle dorsal spines two-thirds to three- 

 fourths eye, last spine a little longer, equal to anal spine; length of 

 pectoral equals snout and e^^e; length of anal base equal to dorsal base 

 and eijual to length of head without snout. 



Anterior part of body with vertical bony plates which decrease in 

 length posteriorly and become small round plates on posterior half of 

 body; on the caudal peduncle they form a sharp keel; they number 

 from 32 to 35. 



Color in spirits very light yellowish brown with only a trace of small 

 dusky punctulations. The membrane of the spinous dorsal dusky or 

 conspicuously black. The soft dorsal and anal ranging from colorless 

 to dusky. Pectoral and caudal without color. 



Numerous specimens taken from a pond at Inokashiro, jNIusashi, 

 near Tokj'o, and one specimen from Aomori difi'er onh" from these in 

 being entirely devoid of plates and in being much darker or more 

 dusk}-. The tins are all more or less dusky and the meml)rane of the 

 spinous dorsal is not darker than the body color. Of 16 specimens 

 counted an ecpial number have 8 and 9 spines. Botb these and the 



