22 Verm, 
VEEMES. 
sperma. The only vessel existing (it contains true blood, and propels 
its fluid by the contractions of its muscular walls) is situated along the 
oesophagus and proboscis, and terminates in a ring, situated just beloAV 
the tentacles, and giving off a branch to each of these. In the circum- 
volutions of the intestine and the manner of its fixation, Phascolion 
approaches Sipunculus and differs from Phascolosoma. It has a single 
“ segmental organ,” situated anteriorly, opening externally near the vent, 
and internally close by, in the body cavity ; this internal orifice, the 
author also observed in Sipunculus, contrary to the statements of 
Brandt. (The existence of this internal orifice of the segmental organ 
in SipuncuUda is also denied by Koren & Danielssen ; cf. Zool. Rec. xii. 
p. 641). Besides its probable secretory function, it is the medium 
through which the sexual products are expelled. The sexes are separate, 
the ovarium or spermarium being situated in the posterior portion of 
the body, but only visible at a certain season of the year (September), 
but the eggs may be found floating in the body-cavity, where they 
undergo their further development, until January. The females are 
t\yo pr jihree tinjes more abundant than tl;e males. 
