ON THE APPENDICES GENITALES (CLASPERS) IN THE SELACHIANS. 85 



Plate I. 

 Fig. 1 — 9. Somniosus microcephalia. 



Fig. 1: The skeleton of the right ventral, viewed from the dorsal side; considerably reduced. 



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

 surface; x articular surface for attaching the piece /?. 



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



— 4: The dorsal terminal piece, Td, from the dorsal side. 

 5: The same piece, from the ventral side. 



— 6: The ventral terminal piece, Tv, from the dorsal side. 



— 7: The same piece from the ventral side. 



8: The * thorn or spur*, T 3 , from the dorsal side. 



— 9: 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 monstrosa. 



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

 b x \ 6*, d**, d*** 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 of 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. 



