640 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



orbital space 3i; width across body at origin of ventrals If; width of 

 mouth 3|; spaco l)otwoen nostrils 7 in snout; eye 7. 



Body elongate and greatly depressed. Head and disk broadly 

 exi)anded, width of latter a])Out two-thirds its length; snout triangu- 

 lar, long, nsirrow, its tip narrowly rounded; eyes rather small; mouth 

 small, below posterior margin of eye, almost straight across; teeth 

 small, pavement-like; nostrils large, each inclined obliquely toward 

 mouth, and space between two-thirds length of either; interorbitaht 

 space flat, a supraocular ridge at each side above eye. Spiracles.- 

 large, and very near posterior margin of eye. Gill-opening small. | 



Body very finely roughened on upper surface, more or less smooth 

 below, with a very obsolete trace of a median keel down l)uck of; 

 slightly' enlarged denticles. 



Dorsals rather large, second only a trifle smaller than first; first- 

 dorsal nearer second than origin of ventral; second dorsal nearer first- 

 tlian end of tail; pectorals very broad, forming greatest width of disk 

 at its posterior third; origin of ventrals nearly midway between front 

 of eye and origin of second dorsal. Caudal broad, depressed, its 

 length two in snout. Sides of tail each with a strong, lateral keel 

 below. 



Color in alcohol, light brown above, below whitish; young speci- 

 mens are marked with little bunches of blackish brown spots. 



Length, 27i inches. 



Described from a male specimen. 



Coasts of Japan; not unconmion. This species was seen at Tokyo, 

 Wakanoura, Onomichi, Hakata, and Nagasaki. We have specimens i 

 from Hiroshima, Hakata. Nagasaki, and AVakanoura; also one from 

 Tokyo, taken by K. Otaki. In this latter specimen, the lower surface 

 of the snout is dark brown. 



(Named for Professor Schlegel.) 



38. RHINOBATUS POLYOPHTHALMUS Bleeker. 



MhinohatKx jxjIi/opJttJuthnu.s Bleeker, Nieuwe Nalezin^, 1854, Japan, ]>. 129; 



Nagasaki; Nat. Tyd. Ned., Ind., VI, 1854, p. 423; Act. 80c. Sci. Indo. 



Neerl., Ill, 1857, Japan, IV, pi. iv. 

 Rlimohahm columnx Steindachner, Reise Aurora, 1898, p. 225; Ko))e (not of 



Bonaparte ) . 



Head 4.i in length; snout 6^ in head; eye 5 in snout; width of disk 

 2f in its length. Snout acute, processes of rostrum not distinct; 

 nares more than their length, distant, continued below till narrowly 

 separate; nasal flap frmged; li})S without sulcation above, continu- 

 ous l)elow; mouth .scarcely undulated, remote from margin of disk. 

 Spiracle close to eye. Orbital ridge armed in front with some spines; 

 lower surface of rostrum smooth; scales very small, 40 small spines 

 down ((Miter of back in front of first dorsal. Dorsals subequal, 

 scarcely emarginate, much higher than length of their bases, and 



