86 



ON THE APPENDICES GENITALEB (CLASPERS) IN THE .SELACHIANS. 



Fig. 20 — 21. Pristiunis inelanostoinus. 



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



— 21: The same, from the ventral side. 



Fig. 22 — 23. Lnmna cormihica. 



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



— 23: The same, from the ventral side. 



Fig. 24 — 27. Rhina sqiiatina. 



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'j ends, hidden in the ventral marginal cartilage Rz'. 



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



— 27: The terminal pieces T?' and T. figured separately. 



Plate III. 



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



Fig. 28 — 31. Torpedo nidnnorata. 



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



The same; the covering piece 7' removed. 



The same, from the ventral side. 



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



Fig. 32 — 34: Naicine sp. 



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



The same, from the ventral side. 



The covering pieces f and r'', from the dorsal side. 



Fig. 35 — 37. Rhinobatiis cohimna'. 



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



The same, from the ventral side. 



The terminal point of the appendage, with the covering piece 7; from the ventral side. 



Fig. 38 — 40. Trygon violacea. 



Fig. 38: The ajjijendage etc., from the dorsal .side; about natural size; the covering pieces v and 7'' 

 removed. 



— 39: The terminal part of the same, from the ventral side, with the covering pieces 7' and v'. 



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



Fig. 41 



— 42 



— 43 



— 44 



Fig. 41 — 44. Raja circiilaris. 



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



The appendage from the dorsal side ; the covering piece rt'j and the terminal piece 7", removed. 



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



The appendage, from the ventral side; the covering f)iece and the terminal piece T, removed. 



