ON THE APPENDICES GENITALES (CLASPERS1 IX THE SELACHIANS. 



87 



Plate IV. 



All the figures represent the skeleton of the appendage of the left ventral fin (or parts of this 



skeleton). 



Fig 45 : 



46 



47 

 - 48 



Fig. 49 

 ■ 50 



— 5 1 



Fi g- 53 : 



54 

 55 

 56 



5/ 



Fig. 45—48. Raja talis. 



The terminal part of the skeleton of the appendage, from the dorsal side; considerably re- 

 duced; the covering piece d and the terminal piece T 3 removed; x a calcified part of the 

 end-style g. 



The same, from the ventral side; all the pieces present. 



The same, from the ventral side; the covering piece and the terminal piece T % removed. 

 The dorsal covering piece, d, seen from the dorsal side. 



Fig. 49 — 52. Raja clavata. 



The appendage with all its pieces, viewed from the dorsal side; considerably reduced. 



The same, from the dorsal side; the covering piece d removed. 



The same, from the ventral side, with all the pieces present. 



The same, from the ventral side; the covering piece d and the terminal piece 7\ removed. 



Fig. 53 57- Raja radiata. 



The skeleton of the appendage with all its parts, from the dorsal side; reduced; x thickened 

 and calcified part of the end-style g. 



The same, from the dorsal side; the covering pieces d s — d 3 removed. 

 The same, from the ventral side; all parts present. 



Part of the dorsal wall of the appendix-slit, viewed from the ventral side; the ventral mar- 

 ginal cartilage and all the terminal pieces of the ventral side, as well as the covering pieces 

 removed. AV is here an independent piece. 



The terminal part of the ventral marginal cartilage with the terminal pieces Tv and 7V 2 , 

 separated from the other skeletal parts, and viewed from the dorsal side (i. e. part of the 

 internal side of the ventral wall of the appendix-slit). 



Plate V. 



All the figures represent the right ventral fin. 

 Fig. 58 — 62. Somniosus microcephalus. 



Fig. 58: Ventral fin, viewed from the ventral side, of a young specimen, 2 m 50°" long; considerably 

 reduced. 



— 59: Part of the same ventral fin, viewed from the dorsal side and a little turned. 



— 60: Part of the ventral of a large specimen, seen from the ventral side; considerably reduced. 



The terminal parts, with the exception of part of the spur /', , covered by aponeui 

 - 61: The same, from the dorsal side; part of the dorsal ray-muscles, Ra, removed, as well as 

 part of the muscular portion arising from the body; a aponeurosis of the Musc.extem 



— 62: Part of the same, showing the muscles of the appendix, after removing the Muse, extensor E, 



the muscular portions O and O' (comp. fig. 59), as also part of the glandular bag (comp. fig. 61). 



