1890.] fin-skeleton of batoid fishes. 685 



Table of Formula of the Fin-rays for the Specimens dissected. 



Forms examined, 



witli total 

 length in centims. 



Ehinobatid^. 



RhinohaUis columrKB, c?,43'5 



Hhinobafus yranulatus, cJ , 23'5 (fig. 8, p. 678) 



Rkynchobatm djcddensis, 5 , 52 



RhynchohatuR djeddcnsis, c? , 66 



Trygonorhina fasciata, ^, 26 



Eaud^. 

 Eaia batis, 

 Fata clavafa, 

 Raia maculafa, 

 var. adults 

 Raia clavata : 



juv.,12-5 



jiiv., 13-5 



Raia radiata, (^ 2 (%• 7, p- 678) 



TrYOONIDjE. 



(Measured to end of pelvic fins.) 



Pteroplatca hinnido : 



c?,23-5(flg.l,p. 676) 



c?,40(fig.2,p. 676) 



Trygon pastinaca 



d,39i 



2,71 



2,74 



2, 108 



2, ICO (fig.9, p. 681) 



Trygon imrnak : 



2,27 



c?,34 



2,36 



Urolophus tesfaceus : 



c?,38 



2,41^ 



MYLIOBATIDiE. 



Myliobatis aquila : 



2,23 



c?,27-5 



2, 29-5 (fig. 3, p. 676).... 



TORPEDINID^. 



Astrape dipierygia, c5", 17 



Hypnos subn/grum : 



2.32 



2,42 



Torpedo marmorata, ^ , 22 



Torpedo narce, <S , 37 (fig. 10, p. 681) 



Mesopterygial rays 



fused to 



form 



meso- 



pterygium. 



7-8 

 6-7 

 4-5 

 5-6 



7-8 



9-11 



9-11 



8-9 

 6 



10-12 

 11-13 



S-11 



8? 

 8? 

 7-9 



10-11 



6 

 5-6 



11 

 8-9 



111 appo- 

 sition 

 with liiub- 

 circlle. 



4 



4 

 3-4 

 3-4 



4 



3-5 



3 



3-4 

 4 



8-10 

 aU 



5 



5 



Z-A 



3 



4-5 



4-5 



4-5 



5 



5 



5 



2-3 



3 

 2-3 

 2-3 



3 



Neo- 



pterygial 



rays. 



3-4 

 4-5 

 3-4 

 3-4 

 5-6 



3-7 



7 



6 



4-5 



11-13 

 12-13 



9-12 



14-16 ? 



14-15 ? 



12 



2?? 



^ Pterygia all imited on one side. 



^ Mesopterygium fused posteriorly with metapterygium. 



Proc. Zool. Soc.— 1890, No. XLVI. 46 



