86 



ON THE APPENDICES GENITALEB (CLASPERSi IN THE SELACHIANS. 



Fig. 20 — 21. Pristiurus melanostomus. 



Fig. 20: The appendage, from the dorsal side; natural size. 



— 21: The same, from the ventral side. 



Fig. 22 — 23. Lamna cornubica. 



Fig. 22: The appendage, from the dorsal side; much reduced. 



— 23: The same, from the ventral side. 



Fig. 24 — 27. Rhina squatina. 



Fig. 24: The appendage, from the ventral side; reduced. 



— 25: The distal end of the same, from the dorsal side; * indicates the place where the terminal 



piece T- ends, hidden in the ventral marginal cartilage Rv. 



— 26: The same part, from the ventral side; the covering piece .' removed. 



— 27: The terminal pieces Tv and T~ figured separately. 



Plate HI. 



All the figures represent the skeleton of the appendage of the right ventral fin (or parts of this skeletonl. 



Fig. 28 — 31. Torpedo marmorata. 



Fig. 28: The distal end of the appendix-skeleton, from the dorsal side; about natural size. 



— 29: The same; the covering piece v removed. 



— 30: The same, from the ventral side. 



— 31: The same, from the ventral side; the covering piece 7' removed. 



Fig. 32 — 34: Narcine sp. 



The appendage, from the dorsal side; somewhat enlarged; the covering piece 7' removed. 



The same, from the ventral side. 



The coveriug pieces r and -'', from the dorsal side. 



Fig. 35 — 37. Rhinobatus columnce. 



The appendage etc., from the dorsal side; about natural size; the covering piece v removed. 



The same, from the ventral side. 



The terminal point of the appendage, with the covering piece v, from the ventral side. 



Fig. 38 — 40. Trygon violacea. 



Fig. 38: The appendage etc., from the dorsal side; about natural size; the covering pieces '■ and :■' 

 removed. 

 - 39: The terminal part of the same, from the ventral side, with the covering pieces ■• and v'. 

 40: The appendage from the ventral side; the covering pieces removed. 



Fig. 41 



42 



43 

 — 44 



Fig. 41 — 44 Raja circularis. 



The terminal part of the appendix-skeleton, from the dorsal side; natural size. 



The appendage from the dorsal side; the covering piece d- and the terminal piece T 3 removed. 



The terminal part of the same, from the ventral side. 



The appendage, from the ventral side; the covering piece and the terminal piece T h removed. 





