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 R. stellulata or R. 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. 
Ventrals 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, #3. 
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 coopert 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 binoculata. We have seen examples 
of all sizes from six inches to six feetin length. A skin of an individual 
six feet in length was obtained by us at Victoria. In its stomach were 
two specimens of Cottus polyacanthocephalus, each afoot long. Thus far 
no examples of any of the other species over 24 feet in length have been 
noticed. 
a 
i 
8 g E etnlita : | o 
= mM 59° | S | 
a Sr ilaieeoieredlh iit heap alae 
ao | is) Se 3 Sa) So 
See ane eee los eta | iia Sopa armed ag Ins 
Table of measurements. 2 Bye eeStajee|| pane mer | iss see 
So SE TE re a ee aR Srey STE 
s* 25 Se Se S Soi Sg 
= Seq, ise sen) “Ss! | Say ae 
: : 2m wie es peek 
Extreme length, in inches. ....-----.--.------- 28.80 | 26.25! 927.65 | 21.6 | 23.45 | 24 | 17. 45 
Length of disk, ininches=100 ........--..- --.] 18.40] 16.85} 17.3 | 13 14.90 | 18.65 | 10.10 
Bebuskeoreatostiwidthe se sesse tetas see saooess ac 103 111 119 106 113) ) 213. 121 
Width midway between snout and mouth.-..-. ARE A AEE SSMT eee TOME, SEMe sa LURE Nee 41 
MaAdthvatiiront of yess 92. 25..5-4.-- -j.22---\- cH ON ea digo] PO ceeB ee 7 yl ae eters 22 ere 58 
Distance from snout to pectoral angle .-..------}.-- esata, He 86:5" [Passe (Eb [Ut | eec8e 
Distance from snout to first gill-opening ..---- |..-..--- SL eect Meese GG Be os aoe Sa caneso|acemoe 
Distance from snout to mouth.....-...--.------ 30 29.5 24 Dib 25 21 24 
Distance from first to last gill-opening. ---..--- 12 ih |e e is 1 SOREN GBS ea dieeecaaee 14 
editor monunh wns eeeee eee ee. Le 15.57 | 145 1) 95251 15 155 | 1b.5) | 18 
Distanceypeuween NOStuis css. os. --\------e=mn2]-- 0-6 TEED) PVAN GS Bre eeeee 13.5 TRAE |Ree ee 
MinmMetewoOrpiueesteeea sees cccas cows ceae 5.5 Cre a 5.5 Tee Nr eet 8 
Length of snout from eye .....-.---..----.----- 31 30ED 4 |) »28sbe eee DTS |e eos Oe liao 
Length of nasal fle (EA apse eet emer Bea |e, ene tae 
Distance between first gill-openings .-.-.--.....-- 26.3 DOs |sacee ...| 25.5 |) 26.5 25 |: 81.5 
Distance between last gill-openings ..--.-.----- 16.5 17 TS teo |) 16s5 15 | 18 
Tmperoubitalawidthees. ose seas se sees cs-- ses os: 8 8 10.5 8 be 7.8 | 8 
Rar Meno these ee ane cma state wocc vase i cacces oT 55 60 Git Oa 80 | 71.5 
Distance between dorsals .......--------------- 3 3.5 3 Basa ie se Seal) flO) ON ees 
i ' ] 
NEEAH Bay, WAsH., May 31, 1880. 
