StaRKS: K HIHYOLOGICAL Sl'RVEY AliOUT SaN JuAN ISLANDS. 107 



intL'ri)rl)ital width !)>• froiii thri'c-fdiirths to onv diaim-ler of the eye. 

 The nearest point from the eye to the edge of the disk is always greater 

 than the interspiracle width. The distance from the median convex 

 area at the side of the front of the disk is not on or half of the inter- 

 orbital space from a straight line drawn from the tip of the snout to 

 the outer pectoral edge. In specimens twenty inches long there are 

 a few spinules on the interorbitai, snout, anterior edge of pectora,l, 

 and on the median line of the back posteriorly. S])ecimens twelve 

 inches long and under are, with the exception of the enlarged spines, 

 perfectK" smooth. 



In the following table measurements are given in hundredths of 



the length of the disk. 



Raja rhina. 



-5 1 



440 



291 



250 

 117 



40 

 32 



14 



37 



& 

 482 

 337 



280 





San Francisco. 



C? 

 525 

 376 



320 



120 



37 



34 

 8 



S-5 

 12 



14 



44 

 15 



36! 35 



790 

 550 



473 

 119 



38 



32 



9 

 795 

 552 



465 

 119 



37 



33 



8.5 



6 

 13 



47 

 17 



35 



810 

 560 



463 



37 



30 

 9 



6.5 



47 

 17 



32 



9 

 850 

 600 



50s 

 120 



39 



2i 



9 



9 

 900 

 620 



535 

 118 



37 



33 



9 



9-5 II 



45 

 i6 



36 



'From tip of snout to a point on median line opposite tips of pectorals. 



2 From a point where a line drawn between angles of pectorals crosses median 

 line of back measured back to posterior edge of disk. 



'Outer lobe of ventral held straight back and measured from notch in posterior 

 edge of fin. 



