84 ON THE APPENDICES GENITAI.ES (CLASPERSl IN THE SELACHIANS. 



EXPLANATION OF THE FIGURES. 



. I : Muscuhcs adductor. 

 of: The appendix-slit. 

 B: The basale metapterygii. 

 b: The appendix-stem. 

 b\ , b 2 , ?>$, b A : The stem-joints between the appendix-stem and the basale. 

 fi: The dorsal stem-piece. 

 D: Musculus dilatator. 

 d } </,, d 2 , d z : Dorsal covering pieces. 



da 1} da: Terminal pieces belonging to the ventral side (in some Ra/a-species). 

 E: Muscultis extensor. 



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

 //: Horn} - filaments. 

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

 P: The pelvis. 

 R: Marginal ray. 

 r: Rays. 

 Ra: Ray-muscles. 



Rd: The dorsal marginal cartilage. 



Rd' ': Process from the dorsal marginal cartilage (in ifo/rt-species). 

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

 Rv: The ventral marginal cartilage. 

 .S': Musculus compressor. 



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

 Td, Td 2 : Dorsal terminal pieces. 

 Tv, 7?' 2 , T s : \ T entral terminal pieces. 

 r>, v'\ Ventral covering pieces. 



