PLANARIANS FROM MAURITIUS AND RODRIGUES 131 
The mouth-opening, which leads into the peripharyngeal 
chamber, is placed somewhat behind the centre of the body, in 
the mid-ventral line. 
The common genital opening lies nearer to the posterior end 
of the body than to the mouth-opening. 
Epidermis and Body-glands.—tThe following ac- 
count is based on a single specimen received from the British 
Museum. ‘The epidermis consists of a layer of columnar cells, 
which are about equally high on the dorsal and ventral surface, 
and possess cilia, which, however, are confined to the latter sur- 
face. It contains spindle-shaped rhabdites on the dorsal surface 
only, where they are found in enormous quantities, evidently 
situated between the epidermal cells. Immediately beneath the 
superficial muscular system there occur such rhabdites as are still 
contained in their mother-cells. These are scattered in sparse 
numbers in the parenchyma. There are enormous quantities 
’ of slime glands, deeply situated in the parenchyma, opening not 
only to the exterior all over the surface of the sole, but in 
a narrow zone of the ventral surface along and just within the 
margin of the body. 
Muscular System.—tThe musculature of the body pre- 
sents no noteworthy features, consisting, as it does, of two 
systems, superficial and deep, which are rather more strongly 
developed on the ventral than on the dorsal side, doubtless in 
relation to the movements. Dorso-ventral fibres occur also in 
the usual manner. 
Digestive System.—The mouth-opening is situated 
somewhat behind the middle of the body and at nearly the 
centre of the peripharyngeal cavity, with the pharynx horizon- 
tally disposed. The pharynx is a cylindrical tube, terminating 
conically at the free end. Embedded in the parenchyma 
in front of the pharynx-insertion are numerous salivary 
glands, which continue their way to the free end of the 
pharynx. 
All the three main trunks of the intestine give off numerous 
lateral branches, which are sometimes bifurcated and sometimes 
“multifurcated ’. The epithelium consists, as usual, of a single 
K 2 
