g 4 ON THE APPENDICES GENITALES (CLASPERS) IN THE SELACHIANS. 



EXPLANATION OF THE FIGURES. 



A : Mus cuius adductor, 

 a/: The appendix-slit. 

 B: The basale metapterygii. 

 b: The appendix-stem. 

 b 1} b 2 , b iy b 4 : The stem-joints between the appendix-stem and the basale. 

 ft: The dorsal stem-piece. 

 D: Musculus dilatator, 

 d, r/j, d 2 , d % : Dorsal covering pieces. 



da ly da: Terminal pieces belonging to the ventral side (in some i?«/#-speeies). 

 E: Mu sen lits extensor. 



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

 //: Horny filaments. 

 O, O': Fin-mnscles arising from the body. 

 P: The pelvis. 

 R: Marginal ray. 

 ;■: Rays. 

 Ra: Ray-muscles. 



Rd: The dorsal marginal cartilage. 



Rd ': Process from the dorsal marginal cartilage (in Raja-species). 

 Rd 2 : A special terminal piece, added to the dorsal marginal cartilage. 

 Rv: The ventral marginal cartilage. 

 JT: JMusculus compressor. 



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

 Td, Td 2 : Dorsal terminal pieces. 

 Tv, Tv 2 , T 3 : Ventral terminal pieces. 

 v, v' : Ventral covering pieces. 



