180 



ZOOLOGY 



SECT. 



end of the vas deferens (v. df. ) is dilated to form a large cylindrical 

 vesicula seminahs (rs. sem.) imperfectly divided into compartments 

 by transverse partitions (B) and filled with a greenish jelly. The 

 spermatophores (sph.) are passed into these compartments and 



olf.Z 



cp. 



B 



cbbm. 

 opC.L I 



4 , cp.rsl 



ch.ptoo. 



rrtecL.obt 



Fi<;. 803. Callorbynchus antarcticus. A,-dor.al view of brain after removal of the mem- 

 branes ; B, side view with the membranes in place. <-l>l m. cerebellum ; clt. pi jr. 1, choroid 

 plexus of fore-brain; ch. r ^.c. 2, of hind-brain; cp. rst. corpus restiforme ; cp. xtr. corpus 

 striatum ; crb. k. cerebral hemisphere ; di. coc. diaccele ; (.Hen. diencephalon ; for. M. foramen 

 of Monro ; ll>. inf. lobus inferior ; med. ol/l. medulla oblongata ; tut. coc. metacosle ; Nr. 2, optic 

 nerve ; i\V. .5, trigerninal ; ^Y/-. 8. auditory ; Ar. 10, vagus ; olj. I. olfactor}- lobe ; olf. p. 

 olfactory peduncle ; opt. I. optic lobe ; pn. b. pineal bodj T ; pn. s. pineal stalk ; ptij. pituitary 

 body. 



finally make their way through the central passage into the 

 urino-genital sinus (u. g. s.). The vestigial Miillerian ducts (MuL d.) 

 are much more fully developed than in the Dog-fish : they are 

 complete, though narrow, tubes opening behind into the urino- 



