NO. 1365. 



THE AGOMDJ-: OF JAPAN— JORDAN AND STARKS. 



583 



Our description is from a dried specimen, 158 nmi. in length, from 

 Shiraoi, Hokkaido, presented by Dr. Bashford Dean. It is numbered 

 7731, Ichtlayolooicid Collections, Leland Stanford Junior University 

 Museum. Four dried specimens wei-e secured at Hakodate. One of 

 them is preserved in the U. S. National Museum. 



(Named for David Starr Jordan.) 



4. HYPSAGONUS Gill. 



Hypsagonus Gill, Proc. Ac. Nat. Sci. Phila., 1861, p. 259 {qnadrironiis). 

 Cheiragomis Herzenstein, Bull. Acad. Imp. Sci. de St. Petersh., XIII, 1890, p. 



116 {gradiens — quadricornis) . 



Body compressed, elevated, depth greater than length of head, 

 more than ^ of l)od3^; head small, separated from first dorsal ])y a very 

 deep nuchal depression; top of head very uneven, 1 pair of large 



Fig. 4. — Hypsagonxis quadricornis. 



supraocular and 1 pair of large occipital spines, strong, hlunt: mouth 

 terminal, jaws about equal, a large barbel or none at tip of snout; 

 teeth on jaws, none on vomer or palatines; gill membranes united, 

 free from isthmus; scales or plates large, radially striated, with a 

 central spine or tul)ercle; 2 rows of strong and 2 of weaker s]iiiies 

 along side of body; dorsal lin long, high, beginning innnediatt'ly 

 behind nape, the spines strong, the first serrated; pectorals short, pro- 

 current, the lower 8 or 9 vayii free; ventrals small; vent in'sirly half- 

 way between ventrals and anal. 



This genus differs irom.Agonoin<ihis in iiaviiig a row of small spines 

 along })ase of dorsals, contimious on dorsal side of caudal peduncle as 

 a median row; in having the row of spines at side of belly ♦•ontinuous 

 along base of anal and median ventral surface of caudal ix-dunclc and 

 in having the lower 7 or 8 pectoral rays free. 



{viJH - high; A (/on IIS.) 



