180 



^OOLOGY 



SECT. 



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

 resicula seminalis (vs. 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.l 



ib.trtfl 



J f>ty 



rn.eci.6bt 



FIG. 803. Callorhynchus antarcticus. A,:dorsal view of brain after removal of the mem- 

 , branes ; B, side view with the membranes in place, cblm. cerebellum ; ch. plx. 1, choroid 

 plexus of fore-brain ; ch. plx. 2, of hind-brain ; cp. rst. corpus restiforme ; cp. sir. corpus 

 stnatum ; crb. h. cerebral hemisphere ; di. coe. diacoele ; dien. diencephalon ; for. M. foramen 

 of Monro ; lb. inf. lobus inferior ; med. obi. medulla oblongata ; mt. coe. metaccele ; Nr. 2, optic- 

 nerve ; Nv. 5, trigeminal ; Nr. 8. auditory ; Nr. 10, vagus ; olj. I. olfactory lobe ; olf. y>. 

 olfactory peduncle ; opt. 1. optic lobe ; pn. b. pineal body ; pn. s. pineal stalk ; pty. pituitary 



finally make their way through the central passage into the 

 urine-genital sinus (u. g. s.). The vestigial Mtillerian ducts (Mid. d.) 

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

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



