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, tmt none of them protrudes with any part through the skin. 



The muscular system is as in Sc. stellare, where it will be more particularly mentioned. 



Scy Ilium stellar e (L) 



i PL II, fig. 1S-19; pi. VI, fig. 65— 66.1 

 As upon the whole the ventrals of the male as to contour 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 1 ), but only for a short way (in one 



specimen of the total length of 90='" the 



ah / 



coalesced part has a length of i6 mra ); the 



r~' '"\ small cut in the posterior edge in Sc. 



if f^v canicula has here become a large slit 



[ (in the specimen mentioned above about 



A 26"™); the dermal teeth also spread to a 



f '"' W JJr greater extent on the ventral side of this 



A w l part of the fin. As furthermore 110 lateral 



F Mm •■ Ai fold of the skin is found on the ventral 



f J . y'' side covering the base of the appendices, 



and correspoudina: to the one mentioned in 

 Fig. 7. Fig. 8. 



Sc. cannula, no shells is formed here. 



Fig. 7. Scy Ilium stellar e. The appendage of the right side seen T j 1£ a pp e ndix reaches just outside 

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



F fin-membrane, / winglike process. the posterior fin edge; it is far more big 



Fig. 8. The same appendage seen from the dorsal side- the coa- ^ du ^^ ^ ^ calllal!a , 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 may be the details remind of the latter, they 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 . 6i mm 



- - free part 3 6 " ,m 



- - terminal part 34 mm 



Breadth of the appendix above the terminal part i4 mm 



across - - i6 mm 



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

 is especially caused by the strongly developed process /, which is only 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 



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

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



