(IX THE APPENDICES GEN'ITALES (CLASPERS) IN THE SELACHIANS. 









Fif 



Fi". 28. 



Fig. 27. Calloyhynchus antarciicus. The right 

 ventral appendage from the ventral side; ,1 little 

 reduced, ai abdominal pore. 



Fig. 28. The same from the dorsal sidi 



part, where it passes over the medial edge on the ventral 

 side, and here it ends in the shape of an S"; thus the 

 whole slit is formed like a cork-screw. Immediately be- 

 hind the hole the edges can only with difficulty be 

 separated on account of the stiffness of the skeleton; but 

 in the terminal part the slit is easily opened mi account 

 of the thinness of the skeleton, which is here like a thin, 

 convoluted shaving, which may to a certain degree be 

 unrolled. The inner, tubular hollow of the terminal part, 

 as well as its opening at the point is completely stuffed 

 with secretion, which also fills the hole at the base as 

 well as the nooks between the appendix, the base of the 

 fin, and the body. 



As to the skeleton, I think it pretty sure that 

 in the shaft it is as in Chim(sra\ as we find a rather mov- 

 able joint before the hole , the surroundings of which 

 seem to be quite as in Chiniicra, we may lie justified in 

 supposing the basale to end here; somewhat out on the 

 shaft we find another, little movable joint; accordingl} 

 the piece 5, is found between these two points; on the ventral side the distal border of this piece is 

 distinctly marked by the cessation of the inmost part of the muscular mass of the glandular bag (the 

 calf ); the other part of the skeleton then must be the appendix-stem; this seems here to be formed 

 like a convoluted leaf, in which no separation into branches is found; such branches, no doubt, would 

 be discernible through the membranous skin, if lines of separation really existed (the only place where 

 such a line of separation might perhaps be found, is along the lateral edge of the ventral side, 

 where a longitudinal furrow in the skin is found in both appendices, but I can find no mobility 

 along it, and take it therefore to be due only to the skin). If we imagine dee]) incisions in this carti- 

 laginous leaf, the three-branched form in Chimwra might arise; on the other hand we ma\ from tin.- 

 three branches in Chim&ra (see pi. I, fig. 14, 15) easilv reach the structure in Callorhynchus by ima- 

 gining a coalescing on the dorsal side (fig. 14) of b** and 3***, on the ventral side ol '< : : and b (fig. [5). 



The muscular system, with regard to the appendix-shaft, is evidently as in Chim<cra\ 

 M. dilatator (D) is easily recognised; its chief portion is situated dorsally (.1/. adductoi v. David.), and 

 originates on b, while the inner and ventral portion (J/, flexor v. D.) also lure arises farther forv 

 on the basale, and does not reach so far backward; further the large muscle (Sj of the glandular 

 bag, which in no respects shows other relations than in Chimara, with the only exception that is is 

 a little shortened ventrally. 



The foremost copulatory organs, the pelvic appendages, are very remarkabh formed, and 

 much larger than in Chtmeera. The pouch in which they are hidden, is therefore also much larger; 

 the entrance of this pouch forms, when closed, a longitudinal slit (abt. . - " long), and is situated la- 

 terally, immediately before the ventral fin. The chief part of the organ enclosed in the pouch, corre- 



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