134 TOKIO KABURAKIL 
latter. Far behind the genital opening the oviduct rises obliquely 
upwards, to unite with its fellow of the opposite side imto 
a single common duct, the glandular canal, which opens into 
the penis-sheath from behind, after receiving numerous glands. 
The duct exhibits a distinct lumen throughout the entire 
length. Its direct wall is lined by a ciliated epithelium, outside 
which is a layer of circular muscular fibres. 
At a short distance below the opening of the glandular canal 
the penis-sheath gives rise to a narrow passage, which pursues 
a somewhat tortuous course obliquely backwards and upwards, 
becoming gradually wider at the same time. Beyond the junc- 
tion point of the oviducts it extends further backwards. This 
organ, which doubtless represents the seminal receptacle, has 
a wall consisting of a non-ciliated epithelium and a fine muscular 
coating; in the cavity are found enormous quantities of 
spermatozoa. 
Placocephalus isabellinus Geba. 
(Pl. 4, figs. 1, 2.—Text-fig. 2.) 
Placocephalus isabellinus Geba (11), pp. 385, 386. 
Three specimens of the species, which I identify with 
Placocephalus isabellinus described by Geba from 
the Mauritius Island, were collected by Mr. Thomasset under 
half-rotten logs and rocks in damp places in the same island. 
The head in the preserved state 1s of a semilunar shape and 
not wider than the trunk, from which it is distinctly marked 
off by a constriction. The trunk is dorso-ventrally depressed, 
elongate, and nearly uniformly broad for the most part of its 
length, though it tapers mm the hind parts down to the bluntly 
pointed end. The sole, scarcely raised above the general level, 
extends from the neck to the posterior extremity, its width 
bemg about a quarter that of the body. The large specimen 
was 120 mm. long by 4mm. broad, while the small was 50 mm. 
long by 3 mm. broad. 
As mentioned by Geba, the ground colour of the dorsal surface 
is an umber brown with tive longitudinal black stripes, a median 
