RATA KINCAIDIL 343 



Bank. A species of the same type as R. laevis, and having 30-31 teeth on each 

 side; the back granulated and slate-colored; the ventrals distinguished by retic- 

 ulate markings, and the claspers slender and scarcely expanded." (Gill's MS.) 



Western North American species. 

 Raia aleutica. 



Raia aleutica Gilbert, 1895, Rept. U. S. fish. comm. for 1893, p. 397, pi. 21; Jord. & Everm., 1896, 

 Bull. 47, U. S. nat. mus., p. 75. 



Disk rhomboid, wider than long, front angle 90° or more, outer angles 

 greater, rounded, hinder angles and margins broadly rounded, anterior margins 

 undulated. Snout long, nearly one third as long as the disk without the ventrals, 

 blunt. Eyes small, length about half the interorbital width, the latter being 

 two sevenths of the distance from the end of the snout. Teeth in || rows. 

 Back and tail with close-set stellate spines, larger in front of the eyes, on the 

 snout and in a wide band on each side of the tail. A strong tubercle on each 

 shoulder, a median vertebral row of tubercles (34) from the head to the second 

 dorsal. Lower surfaces smooth. Tail less than half the total length. 



Brown with large obscure dusky blotches; below white, edges of disk and 

 around the vent brown. 



The type a young male of nearly 34 inches in length was taken off the 

 Aleutian Islands, in 81 fathoms. 



A second specimen described with the type may be of another species : — 

 its forward angle was given as about 100°, the rows of teeth fi, and the greatest 

 width of the disk 48 inches. 



Rata kincaidii. 

 Plate 17^ fig. 3. 

 Raia kincaidii Garman, 1908, Bull. M. C. Z., 51, p. 254. 



Disk subcircular, front angle very obtuse, anterior margins not indented; 

 snout short, blunt, hardly produced; outer and hinder angles and hinder margins 

 broadly rounded. Mouth moderate, curved forward in the middle, width less 

 than half the length of snout; teeth comparatively large, in about 33 rows, 

 crowns flattened with a slightly raised sharp angle on the inner margin. Ventrals 

 broad, notch of medium depth. Tail as long as the disk, tapering gradually to 

 slender, produced behind the dorsals, with a rudimentary caudal fin. Dorsals 

 separated by a space with spines. Back and tail covered with small sharp 



