PLANARLIANS FROM MAURITIUS AND RODRIGUES 133 
bulbous part of muscular nature, which contains a cavity of 
somewhat irregular contour, the seminal vesicle. The vesicle 
gives rise to the moderately wide ejaculatory duct which opens 
at the tip of the penis. The muscular fibres of which the penis 
is composed are arranged in two principal sets, circular and 
longitudinal, the fibres of the two sets occurring intermingled 
with one another. Hmbedded in the parenchyma of the penis 
are numerous glands, the ducts of which open into its lumen 
lined by a layer of small columnar cells. 
TExt-Fia. 1. 
ns 
ud sv ed 
' 
' 
Diagrammatic representation figure of the sexual organs of 
Geoplana whartoni Gulliver. ed.=ejaculatory duct. gce.— 
glandular canal. go.=genital opening. od.=oviduct. ps.= 
penis-sheath. .sr. seminal receptacle. sv.=seminal vesicle. vd. = 
vas deferens. ; 
Female Organs.—tThe paired ovary occupies a ventral 
position somewhat behind the brain. It is a nearly oval body 
made up of egg-cells in several stages of development. From 
the lateral aspect of the ovary the oviduct starts as an ampul- 
laceous passage, which soon takes the character of a narrow 
duct and proceeds backwards just outside the longitudinal 
nerve cords, receiving the vitellie glands at numerous points. 
The vitelline glands are represented by branching cellular masses, 
which are extensively distributed in the interstices between the 
gut diverticulae. he mode of the connexion of the glands with 
the oviduct is effected by means of the short branches of the 
