PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 253 



apart, the interspace less than the length of the base. Tail with a slight 

 lateral fold. 



Spines on body small and few. Two or three very small ones over the 

 eye, one at the center of the back, with a minute one in front of it. 

 None along the median line of the back, the median caudal series begin- 

 ging at the base of the ventraLs. These spines are quite small, but grow 

 larger backward. 



Asperities above in the form of minute prickles, somewhat stellate. 

 These are very minute, except along the median line of the back and 

 tail, and there they are smaller than in B. stellulata or B, rhina. Tail 

 entirely prickly above. A broad band of prickles along back to inter- 

 orbital space. Entire pectoral fin minutely prickly, rather coarsely so 

 anteriorly. Nasal ridges prickly. 



Veutrals mostly covered with minute prickles, as is the under side of 

 the snout and the region around the mouth. A row of rather coarser 

 prickles along the edge of the disk anteriorly, on the under side. 



Jaws rather strongly curved. Teeth somewhat tricuspid, ||. 



Length of nasal flap about half the width of the upper jaw. 



Body light brown, with many rather large, faint, round whitish spots, 

 which are very distinct in the young. A vague blackish ring at base of 

 pectoral. 



Raia cooperi is rather common from Monterey Bay to Vancouver's 

 Island, and probably north to Alaska. It is often brought into the 

 markets of San Francisco with the Mnoculata. We have seen examples 

 of all sizes from six inches to six feet in length. A skin of an individual 

 six feet in length was obtained by us at Victoria. In its stomach were 

 two specimens of Cottus polyacanthocephaluSj each a foot long. Thus far 

 no examples of any of the other species over 2^ feet in length have been 

 noticed. 



Table of measurements. 



Extreme lengtli, in inches 



Lenj;;th of disk, in inches=100 



Disk, {greatest width 



Widf li midway between snout and mouth . 



Widtli at front of eyes 



Distance from snout to pectoral angle 



Distance from snout to first gill-opening . 



Diwf ance from snout to mouth 



Distance from first to last gill-opening. . . . 



Width of mouth 



Distance between nostrils 



Diameter of orbit 



Length of snout from eye 



Length of nasal flap . . . .' 



Distance between first gill-openings 



Distance between last gilbopeniugs 



Interorbital width 



Tail, leugtli 



Distance between dorsals 



28.80 

 18.40 

 lO^i 

 It 

 41 



3t) 

 12 

 15.5 



26.25 

 16.85 

 111 



26.3 

 16.5 



77.5 



'29.5' 

 17 



14.5 

 13.2 



6 

 30.5 



7 



25.5 

 17 



.^1 



27.65 

 17.3 

 119 



86.5 



24 



13.5 

 15.5 

 15 

 5 

 28.5 



17. 5 

 10.5 

 60 

 3 





f^ 



21.6 

 13 

 106 

 16.7 

 4.5.5 



50.5 

 2.5 

 12.8 

 15 



5.5 

 23 



25.5 

 14.3 



67 

 3.8 



23.45 

 14.90 

 113 



25 



o 



Is 

 ■.0 fl 



K (=1 



^ o 



24 



13.65 

 113 



17.45 

 10.10 

 121 



1 41 

 58 



21 



1.5. 5 

 13.5 



7.5 

 27.3 



8.5 

 26.5 

 16.5 



7.5 

 56.5 



15.5 

 12.5 



7 

 23.5 



8 

 25 

 15 



7.8 

 80 

 10.5 



71.5 

 5 



Neeah Bay, Wash., 3Iay 31, 1880. 



