~ ( ix THE APPENDICES GENITALES (CLASPERSi IN THE SELACHIANS. 



7 cm 



T cm 



rem 



7 cm 



rem 



made thicker and, towards the end, enlarged in a clavate manner, when compared with the medial 

 one; the lateral branch in particular is often distally much swollen. The dermal teeth are fine, a little 

 bent thorns, all with the points forward, towards the base of the organ. The lateral branch does not 

 contribute to the bordering of the appendix-slit of the terminal part, this slit running only between 

 the medial and the dorsal branch 1 )- 



In three specimens of the respective length of 78"", JJ cm , and jo cm , the measures were: 



The length of the appendix from the fore edge of the cloaca 7,5 cm , 10,5"", 6,5 c,n 



The free part of the shaft 2,3"", 2,6 cm , 2,3° 



The terminal part 4,5 cm , 6 cm , 4,1° 



The breadth (on the broadest part of the shaft) i,i cm , i,6 c "\ i,i c 



The breadth (on the middle) of the terminal part o,7 cm , i,i c,n , o,7 c 



The pelvic copulatory appendage has in all three specimens a length of . 2,i c 



a breadth of o,6 cm . 



In one pair of ventrals, kept in spirit, and skeletonized until the terminal part, belonging to a 

 specimen the total length of which I am not able to give, the appendix has had a length of more 

 than 9 cm , the terminal part of almost 6 cm by a breadth on the middle of i cm , at the end of i,5 cm ; the 

 skeletonized pelvic appendage is 2 cm long, and 1"" broad. 



The skeleton. The pelvic arch is divided in the middle line, so that it is composed of a 

 right and a left piece; behind, dorsally above the articulation with the ventral, each of these pieces 

 is prolonged to a considerable process; on the foremost convex edge the peculiar, movable, foremost 

 eopulatory appendage , the Sageplatte (Gbr.) , is articulated ; the skeleton of this appendage is com- 

 posed of one piece, the medial edge of which bears a row of (5 — 7) large, crooked, finely pointed 

 dermal teeth; when in rest this piece is turned against the ventral surface of the pelvis which is 

 hollowed like a spoon, and then only the toothless edge laterally of the row of teeth is seen in the 

 opening of the pouch. 



The fin-stem consists of a short, flat b as ale B bearing all the rays (the foremost broad mar- 

 ginal ray (R) is coalesced with it), a b z , a good-sized ft, and the appendix-stem b 2 ). 



b 2 is not much shorter than the basale, with which it is connected in a rather movable joint; 

 on its medial side it is flat and broad, on the lateral side longitudinally concave; dorsally it forms a 

 narrow edge, forward produced into a large process _r, which by a lateral incision is made to form 

 the inner bordering of the above mentioned opening, with which the appendix-slit begins; the other 

 part of the dorsal edge of b x is somewhat laterally bent, and bears a rather firm margin of connective 

 tissue; the ventral edge is straight and rounded. 



The piece /? is tolerably triangular, but with curved sides; it is much curved, and situated in 



') In Ckimara affinis Cap. the appendices, according to Goode & Bean (I.e. pi. X, fig. 34, 35), are three-branched 

 trosa, I nit else they seem to differ rather much from those of this latter. The figures, however, are not distinct 

 enough to get a clear notion of the facts. 



t In the figures of Gegenbaur I.e. pi. XVI, fig. 22, 23, and of v. D.avidoff, I.e. pl.XXIX, fig. 19, pi. XXVIII, 



Kg. 3, 4, these skeletal pieces are marked in such a way that: b* = i b Gbr ' , 8 = [''' G '"'' , b = f 6l Gbr ' 



[c D. U 3 D. I d D. 



