XIII 



PHYLUM CHORDATA 



181 



genital sinus (3IuL d.") and in front by a large common aperture 

 (Mid. d!} into the coelome. 



Development. Internal impregnation takes place, and the 

 oosperm becomes surrounded, as in the Dog-fish, by a horny egg- 

 shell secreted by the shell-glands. The egg-shell of Callorhynchus 



-vs. se.m 



Mul.d 



FIG. 804. Callorhynchus antarcticus. A, male urine-genital organs, ventral aspect ; the 

 left testis is removed and the left vesicula seminalis displaced ; B, anterior part of vesicula 

 seminalis in section. <pi<L epididymis ; M kidney ; Mv.l. d. Mlillerian duct ; Mai. <!'. 

 coelomic aperture of Mulleriaii ducts ; Mat. <).". aperture of Miillerian duct into urine-genital 

 sinus ; pa. or. anterior (genital) portion of kidney; spit, spermatophores ; ts. testis ; u. ;/. s. 

 urino-genital sinus ; *-. (//. vas deferens ; c-s. sent, vesicula seminalis ; vs. sem'. its aperture into 

 urino-genital sinus. 



(Fig. 805) is of extraordinary size about 25 cm. in length, 

 or fully five-sixths as long as the abdominal cavity and the 

 elongated chamber for the embryo is surrounded by a broad, flat 

 expansion covered on one side with yellow hair-like processes, and 

 giving the shell a close resemblance, doubtless protective, to a 



* 



