34 



ON THE APPENDICES GENITALES (CLASPERS) IN THE SELACHIANS. 



the corresponding piece in the hitherto mentioned Sharks. All these terminal pieces are hard, white, 

 china-like, bnt none of them protrndes with any part throngh the skin. 



The mnscular system is as in Si: stcllar(\ where it will be more particnlarly mentioned. 



Scyllium stellare (L.) 



(PI. II, fig. iS-ig; pi. VI, fig. 65-66.) 



As upon the whole the ventrals of the male as to contonr and shape are different from those 

 in the preceding species, so it is also the case with the appendices. The ventrals are also here coa- 

 lesced'), bnt onl\- for a short way (in one 



/ specimen of the total length of 90'''" the 

 ah , / 



U / coalesced part has a length of iS™'"); the 



* ^^ small cut in the posterior edge in Sc. 



{I W W^ caiiictila has here become a large slit 



/ \ ■ (in the specimen mentioned above about 



^ i«\ I A ^ ' 26"""); the dermal teeth also spread to a 



' ' 1 JP JF greater extent on the ventral side of this 



V JL . p ^ part of the fin. As furthermore no lateral 



''A If^ io\A of the skin is found on the ventral 



. /' ; side covering the base of the appendices, 



^ hi 



and corresponding to the one mentioned in 

 Fig. 7- Fig. 8. ^ ^ 



Sc. caiiicTila, no «bell.) is formed here. 



Fig. 7. ScyHzum stellare. The appendage of the right side seen ^j^^ appendix reaches jUSt OUtside 



from the ventral side; about the natural size, ab abdominal pore. 



/=■ fin-membrane, / wingUke process. the posterior fin edge; it is far more big 



Fig. 8. The same appendage seen from the dorsal side; the coa- , , ,, ■ r- 71 -n 



, °i . t ^, u t ^^ ^ 1 • ^ J ^1 and clumsy than m i,c. caiiicttla, but still 



lesced part of the membrane of the ventral is cut up, and thrown ' ' 



back. The arrow indicates the direction, in which a sound ma^' be the details remind of the latter thev are 



brought into the appendix-canal. 



only coarser and more conspicuous. 



In a specimen of a total length of 90''" the following measures were found: 



Length of the appendix from the fore-edge of the cloaca to the hindmost point . 61™'" 



— - - free part ^b'"'" 



— - - terminal part 34""" 



Breadth of the appendix above the terminal part 14""" 



— - - — across - — - 16'"'" 



The terminal part is relatively larger than in the preceding species, and its pectiliar appearance 

 is especially caused by the strongly developed process _/, which is onl\' indicated in the preceding 

 species. This process is on the ventral side (fig. 7) hollow, and the bottom of this hollow is naked, 

 which nakedness continues on the soft, outermost point. The greater part of the appendix is also 



') When Lilljeborg 1. c. p. 655 tells that the ventrals in Sc. stellare are not coalesced, he is not quite right. Miiller 

 & Henle I.e. p. 10 .state the fact correctly. 



