84 



ON THE APPENDICES GENITALES (CLASPERS) IN THE SELACHIANS. 



EXPLANATION OF THE FIGURES. 



A : Musaihis adductor, 

 a/: The appendix-slit. 

 B: The basale metapterygii. 

 b: The appendix-stem, 

 ^i, <^2, (^s, 1^4: The stem-joints between the appendix-stem and the basale. 

 /9: The dorsal stem-piece. 

 D: -Musculus dilatator. 

 </, rt'i, d^, (/,: Dorsal covering pieces. 



rt'rti, da: Terminal pieces belonging to the ventral side (in some i^ff/ff-species). 

 E: Aliisctiliis extensor. 



g: The end-style, the uncalcified end of the appendix-stem. 

 h: Horny filaments. 

 (9, O' : Fin-muscles arising from the body. 

 P: The pelvis. 

 R: Marginal ray. 

 t: Rays. 

 Ra: Ray-mnscles. 



Rd: The dorsal marginal cartilage. 



Rd': Process from the dorsal marginal cartilage (in /Lff/r^-species). 

 Rd^: A special terminal piece, added to the dorsal marginal cartilage. 

 Rv: The ventral marginal cartilage. 

 S: Musc7dus compressor. 



s: A ligamentous septum, serving for attaching part of the Muse, adductor. 

 Td^ Td^: Dorsal terminal pieces. 

 7z', 7t'2, T^: Ventral terminal pieces, 

 t', v': Ventral covering pieces. 



