136 TOKIO KABURAKI 
Rhynehodemus ceylonicus von Graff. 
(Pl. 4, figs. 3, 6-8.—Text-figs. 3, 4.) 
Rhynchodemus ceylonicus von Graff (12), pp. 499, Pl. xv, 
figs. 35-38.—Laidlaw (17), p. 579. 
The material was collected by Mr. Snell in the island of 
Rodrigues. At a glance it appeared to be identical with 
Geoplana whartoni described above, as dealt with by the 
collector, but a closer examination has revealed the fact that 
this is not so. After some hesitation I have referred it to von 
Graff's Rh. ceylonicus, which has not been adequately 
deseribed, as Laidlaw referred a worm from Male Atoll to this 
species, but with some doubt. 
This species appears to be fairly common in this island, as it 
has been procured in enormous quantities at Grande Montagne 
and also at Mount Malartic. According to Mr. Snell’s statement, 
it is found under decaying logs, on the bark, under the bark, or 
in the wood; the nemertean appeared to exist in far greater 
quantities than the terrestrial planarians, but these often live 
together in the same place. 
External Characters (Pl. 4, fig.3)—The body in the 
preserved state is nearly oval in transverse section, elongate, 
slender, and for the greater part of a uniform width, though it 
gradually tapers off towards the anterior and posterior ends, 
which are bluntly pointed. The ventral surface is made up of 
the median somewhat raised sole, on which the animal creeps. 
It extends over almost the whole length of the body and is 
rather less than one-fourth the width of the body. This species 
is wholly devoid of any trace of a sensory pit at the anterior tip. 
In length the animals range from 22mm. to 45mm.; the 
difference in length depending upon the state of contraction. 
The 45 mm. specimen was not less than 8 mm. across. 
Von Graff is speaking of the coloration of the body as a whole 
when he states in his description : ‘ Die Grundfarbe ist lebhaft 
gelb (sulphureo-citrinus) und der Ricken mit drei sehr kraftigen 
schwarzbraunen Streifen versehen, von welchen aber die beiden 
