TRYGONOPTERA. 409 



Urolophus kaianus. 



Urolophus kaianus Gunthkr, 1880, Challenger rept. Zool., 1, p. 37. 



Disk broader than long, front angle very obtuse, snout not projecting. 

 No dorsal fin. Tail little shorter than disk. Skin smooth. Snout to vent 

 four and three eighths, end of tail to vent four and one half, and greatest width 

 five and five sixths inches. Specimens described eight and seven eighths and 

 nine and one fourth inches in total lengths. 



Uniform brownish. 



Ki Islands, at 129 fathoms. 



Urolophus fuscus. 



Urolophus fuscus Garman, 1885, Proc. U. S. nat. mus., 8, p. 41; Jord. & Fowler, 1903, Proc. U. S. nat. 

 mus., 26, p. 657. 



Disk subquadrangular, hardly as broad as long, front margins meeting in 

 a blunt angle, tip of snout prominent. Eye small, orbit as long as the spiracle. 

 Interorbital space as wide as the mouth, which is less than half the distance 

 between tip of snout and mouth. Mouth medium, curved forward, with three 

 papillae on its floor, middle one bifurcate. Tail from vent equal to distance 

 from vent to front of nostril, fin depths moderate, end blunt, spine inserted 

 httle in front of mid length. Ventrals rather short and broad, claspers short 

 and stout. Skin smooth. 



Total length 122, snout to pores 7, and greatest width 7i inches. 



Back, tail and lower edges of fins reddish brown or olive, elsewhere white. 



Japan. 



Trygonoptera. 



Trygonoptera Muller & Henle, 1841, Plagios., p. 174. 



Disk subquadrangular, narrower backward, angled in front, outer and hinder 

 angles rounded. Ventrals short, broad. Tail shorter than the disk, not thread- 

 like, with rayed caudal fins, and with a small dorsal in front of the spine near mid 

 length. 



Angle at junction of front margins very blunt 



back uniform reddish brown .... testacea (page 410) 

 back spotted javanica (page 410) 



Angle at junction of front margins nearly right 



back uniform brown ...... hucculenta (page 410) 



