PLANARIANS FROM MAURITIUS AND RODRIGUES {37 
lateralen mehr als doppelt so breit sind als der mediane. Hinten 
convergiren die feimer werdenden Lingsstreifen, ohne aber 
zusammenzufliessen, vorne verschwimmen sie inder graubraunen 
Pigmentirung des nur an der dussersten Spitze farblosen 
Vorderendes. Hine gleiche Tribung findet sich auch auf der 
Bauchseite des Vorderkérpers. Sie verschwindet erst gegen die 
Mitte der Korperlange und erstreckt sich vom Aussenrande der 
Seitenstreifen des Riickens bis an die Kriechleiste, in deren 
Umgebung sie am dunkelsten wird.’ 
In the specimen I have examined, the dorsal surface is of a 
uniform orange colour with a slight touch of grey and marked 
with three fine black longitudinal stripes, comprised of one 
TEXT-FIG. 3. 
ee 
Eyes of Rhynchodemus ceylonicus von Graff. 
median and two lateral, these latter converging towards the 
extremities of the body and meeting the median one. At the 
anterior end the lines thicken and then coalesce, revealing a dark 
tip unlike von Graff’s form, in which the anterior tip is light. In 
most instances the lateral lines are much thicker than the 
median. Sometimes the former get slightly lighter and are less 
strongly marked than the latter. The ventral surface is much 
paler than the dorsal, except on the sole, where the colour is 
nearly white. 
The eyes, which are only two in number, occur on either side 
near the anterior tip of the body. 
The mouth-opening which leads into the peripharyngeal 
chamber lies nearly in the middle of the body, differimg from 
von Graff’s form, in which it is situated at the commencement 
of the posterior fifth of the body. The pharynx in the normal 
condition is usually completely retracted and hidden within the 
