ON THE APPENDICES GENITALIAS (CLASPERS IN THE SELACHIANS. 



85 



Fig. 1 : 



— 2: 



Plate I. 



Fig. 1 — 9. Somniosus microcephalus. 



The skeleton of the right ventral, viewed from the dorsal side; considerably reduced. 



The chief piece of the right appendage, viewed from the dorsal side; reduced. / the lateral 



surface; x articular surface for attaching the piece t 3. 



The same skeletal part, from the ventral side. 



The dorsal terminal piece, Td, from the dorsal side. 



The same piece, from the ventral side. 



The ventral terminal piece, 7z>, from the dorsal side. 



The same piece from the ventral side. 



The thorn or spur , T'., from the dorsal side. 



The same, from the ventral side. 



Fig. 10— 11. Acanthias vulgaris. 



Fig. 10: The skeleton of the right appendage, from the dorsal side; natural size. 



— 11: The same skeletal part, from the ventral side. 



Fig. 12 — 13. Spinax niger. 



Fig. 12: The skeleton of the right appendage, from the dorsal side; a little enlarged. 



— 13: The same, from the ventral side. 



Fig. 14 — 15. Chimcera inoustrosa. 



Fig. 14: The skeleton of the right ventral, from the dorsal side; natural size, x process on the piece 

 l\ ; //*, £** 6*** the medial, dorsal, and lateral branches af the appendix-stem. 



— 15: The same skeletal parts, from the ventral side. 



Plate II. 



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



Fig. 16 — 17. Scyllium canicula. 



Fig. 16: The skeleton of the appendage, from the dorsal side; natural size. 

 17: The same, from the ventral side. 



Fig. 18 — 19. Scyllium stellare. 



Fig. 18: The appendage, from the dorsal side; natural size. 

 — 19: The same, from the ventral side. 



