86 



ON THE APPENDICES GENITALEB (CLASPERS) 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 z ends, hidden in the ventral marginal cartilage Rv. 



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



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



Plate III. 



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



Fig. 28 — 31. Torpedo marmorata. 



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



The same; the covering piece r> removed. 



The same, from the ventral side. 



The same, from the ventral side; the covering piece v removed. 



Fig. 32 — 34: Narcine sp. 



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



The same, from the ventral side. 



The covering pieces v and 7 ,f , from the dorsal side. 



Fig. 35 — 37. Rhinobatus columnce. 



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



The appendage etc., from the dorsal side; about natural size; the covering pieces v and v\ 



removed. 

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

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



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 3 removed. 



Fig- 38: 



- 39 

 40 



Fig. 41 

 - 42 



' 43 

 ■ 44 



