XIII 



PHYLUM CHORDATA 



181 



genital sinus (MuL d") and in front by a large common aperture 

 (MuL 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 



Mul.d 



i/s.sem 



Mul.d 



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

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

 seminalis in section, epid. epididymis ; kd kidney ; MuL d. Mttllerian duct ; MuL d'. 

 ccelomic aperture of Mttllerian ducts ; MuL d". aperture of Mlillerian duct into urine-genital 

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

 urino-genital sinus ; r. <lf. vas deferens ; cs. sem. vesicula seminalis ; va. seni'. its aperture into 

 urmo-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 



N 2* 



