514 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Sturio schrcncki Dybowski, Verb, zool.-bot. Gesell. Wieu, vol. 22^ p. 219, 1872 

 (Amur, Ussuri, Sungatschin, Hanka, Argun, Onon) ; Rep. St. I'eters- 

 bourg Dep. Imp. Russ. Georgr. Soc, vol. 8, p. 24, 1877 (above localities). 



Acipenser sturio (not Linnaeus) Georgi, Reise im Russ. Reich., vol. 1, p. 352, 1775 

 (Schilka). — Pallas, Zoogr. Rosso-Asiat., vol. 3, p. 91, 1811 (Eastern seas). — 

 Maack, Travels in Ussuri, p. 200, 1861 (Amur, Ussuri, Sungatschin, Lake 

 Hanka). 



ANALYSIS OF SPECIES 



a\ Snout obtuse or short, at least 1 or 2 times in postocular. 

 h\ Dorsal rays iii or iv, 31 to 36. 

 c*. Lateral plates 41 to 43; dorsal plates 15 or 16; ventral plates 12 to 16. 



multiscutatus 



c^ Lateral plates 34; dorsal plates 7 or 8; ventral plates 9 acutirostris 



h'. Dorsal rays in, 63; lateral plates 32; ventral plates 11 kikuchii 



<r. Snout elongate, attenuate, slender, at least longer than i>ostocular. 



d'. Lateral plates 33 ; no asperities between preopercle and opercle. 



dabryanus 



d'. Lateral plates 40 or 41 ; row of vertical asperities between proopercle 



and opercle chinensis 



ACIPENSER MULTISCUTATUS Tanaka 



Acipenser multiscutatus Tanaka, Journ. College Sci. Tokyo, vol. 23, art. 7, p. 21, 

 pi. 2, fig. 1, 1908 (type locality: 7 miles off Ikedohama, Iwaki, Tokyo). 



Depth 6% to subcaudal origin; head 44^^, width 1%. Snout 2% 

 in head, short, rather obtuse; eye 17%; preoral length 1%; inter- 

 orbital 11%, longitudinally concave. 



Dorsal plates 15 or 16, each with median longitudinal ridge, with- 

 out distinct spine, large, rugose, close behind small plate from fourth 

 to seventh; lateral plates 41 to 43, similar to dorsal, anterior 2 each 

 with small plate in front and all well separated though without pos- 

 terior small plate ; ventral plates 12 to 16. Behind dorsal fin 4 or 5 

 rugose plates, 3 behind, 2 before anal; skin between rows of plates 

 soft and smooth ; large scapular plate with small one posterior ; cheek 

 with fine stellate prickles; skin with rather sparse, small, stellate 

 prickles. 



Dorsal begins behind ends of ventrals, front edge li/^ in head, rays 

 VII, 35; anal begins behind middle of dorsal base, rays vii, 28; 

 caudal 3% in rest of body, subcaudal li^ in caudal or equals head; 

 pectoral II/2 ; ventral about 2. 



Color ? Length, 2,120 mm. (Tanaka.) 



Northern Japan. 



ACIPENSER ACUTIROSTRIS Ayres 



Acipenser acutirostris Ayres, Proc. California Acad. Sci., vol. 1, p. 14, 1854 (type 

 locality: San Francisco). — GtJNTHER, Cat. Fishes British Mug., vol. 8, p. 344, 

 1870 (from Ayres). 



