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. 



Mesopterygial rays 



EniNOBATIDiE. 



Bhinohatus columnm, c? , 43'5 



Rhiiiobatus yranulafus, i^ , 23-5 (fig. 8, p. 678) 



Rhynchohatus djeddensis, 5 1 52 



lihy^ichohatua djeddensis, (5 , 66 



Trygonorhina faseiata, cJ, 26 



Eaiid^si. 

 Baia hatis, 

 Baia da vat a, 

 Baia maculata, 



var. adults 

 Baia clavata : 



juv., 12'5 



juv., 13-5 



Baia radiata, (J $ (fig. 7, p. 678) 



Trygonid^. 

 (Measured to end of pelvic fins.) 



Pteroplatea hinmdo : 



J, 23-5 (fig. 1, p. 676) 



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



Trygon pastinaca 



d.39^ 



2,71 



2,74 



2, 108 



$.160 (fig. 9, p. 681) 



Trygon uarnak : 



2,27 



(?,34 



2,36 



Urolophus tcstaceus : 



c?,38 



?,41^ 



MTLIOBATID.aB. 



Myllobatis aqidla : 



2,23 



j> 27'5 



5;29-5(flg.'3,"p.'676)!!!. 



TORPBDINID-E. 



Astrape dlpterygia, c?)17 



Hypnos stibnigrum : 



2.32 



2,42 



Torpedo marmorata, cJ , 22 



Torpedo narce, d , 37 (fig. 10, p. 681) 



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 



8-11 



8? 

 8? 

 7-9 



10-11 



6 

 5-6 

 11 

 8-9 



in appo- 

 sition 

 witli liuib- 

 girdle. 



4 



4 

 3-4 

 3-4 



4 



3-5 



3 

 3-4 



4 



8-10 

 aU 



5 



5 



3^ 



3 



4-5 



4-5 



4-5 



5 



5 



5 



2-3 



3 



2-3 

 2-3 



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?? 



1 Pterygia all united on one side. 



2 Mesoptervgium fused posteriorly with metapterygiuni. 

 - ' ■— -^ ^'^'^ 46 



Total. 



10-12 



10-12 



7-9 



8-10 



12-14 



12-18 



16-18 

 14-1.^) 

 10-11 



21-25 

 23-26 



14-16 

 12-14 

 11-13 

 10-11 

 20 



24 

 23-24 

 18-21 



14 

 15 



22-24 

 22-23 

 19-21 



10-11 



6 



5-6 



11 



10-11 



Proc. Zool. Soc.— 1890, No. XLVI. 



