346 THE PLAGIOSTOMIA. 



on the orbital ridges. A tubercle on each shoulder, a median series of hooked 

 tubercles behind the head to the dorsal, interrupted behind the first four to 

 those on the tail. 



Imperfectly known from the original description. 



Bering Sea. 



Raia rosispinis. 



Raia rosispinis Gill and Townsend, 1897, Proc. Biol. soc. Washington, 11, p. 231; Jord. & Everm., 



1898, Bull. 47, U. S. nat. mus., p. 2751. 

 Raia obtusa Gill & Townsend, 1897, Proc. Biol. soc. Washington, 11, p. 231. 



Snout moderate, bluntish, rostral cartilage soft, narrow. Interorbital 

 space nearly plane. Mouth small, width equal half the length of the snout. 

 Borders of pectorals and ventrals naked. Snout with spinules, and with a 

 number of stellate-based spines about the middle; larger spines scattered 

 "between the disk and the pectoral rays." Two spines on each shoulder, one 

 spine in front of and one behind each eye and "another behind it about half the 

 distance." A median row of about 26 spines from near the head to the dorsal. 



Bering Sea. (Gill and Townsend, loc. cit.). 



Raia binoculata. 



Raia binoculata Girard, 1854, Proc. Acad. nat. sci. Phil., p. 196; Jordan & Gilbert, 1882, Bull. 16, 

 U. S. nat. mus., p. 878; Jord. & Everm., 1896, Bull. 47, U. S. nat. mus., p. 72. 



Uraptera binoculata Girard, 1858, Rept. Pacif . R. R., Fish., p. 373. 



Raia cooperi Girard, 1858, Rept. Pacif. R. R., Fish., p. 372; Jordan & Gilbert, 1880, Proc. U. S. nat. 

 mus., 3, p. 135; 1882, Bull. 16, U. S. nat. mus., p. 42. 



Disk rhomboid, width nearly one third greater than the length of the body 

 to the pores, front angle and outer angles nearly 90°, blunted, anterior margin 

 undulated, somewhat indented, snout little produced, rounded. Mouth slightly 

 arched, width more than half the length of the snout. Teeth small, with a low 

 rounded keel ending in a point, in 48 rows. Eyes smaller than the spiracles, 

 length near one third of their distance apart, or one sixth of that from the end 

 of the snout. Minute spines roughen the upper surfaces and below the snout 

 and the anterior margins. An irregular median series of small tubercles, or a 

 narrow band, from above the abdomen, on the tail to the second dorsal. Young 

 specimens smoother on the fins and below the disk, with a more regular median 

 series of tubercles on the tail and with a single tubercle in front of and another 

 behind each eye, another behind the head and commonly one on each shoulder. 

 Tail depressed, length more than two thirds that of the body, dorsals separated 

 by a space with spines. 



