Vol. [X, No. 11.] The Planarians of the Lake of Tiberias. 46% 
[N.S.] 
cedarwood oil. The pharynx normally occupies the middle of 
the body, but its position may vary considerably; such varia- 
tion is easily explained if the animal reproduces by transverse 
fission. for, at least in other species where this method is 
adopted, the constriction occurs immediately posterior to the 
mouth of the parent. The mouth is the only aperture present. 
gut were not so wide and appeared only as a delicate ramify- 
ing system. 
It is particularly interesting to trace the course of the 
digestive system in the bifurcated caudal region of the speci- 
men which showed this feature prominently. A glance at fig. 
4, which was drawn with the aid of a camera lucida, shows: 
that at the level of the mouth a well-marked branch is given 
off from the main posterior lateral branch, thus fully providing 
for the nutrition of this secondary part; moreover, this subsi- 
diary gut will be seen to form a definite forking a little beyond 
half-way along its course in strong resemblance to that of the 
main body. Further, sectionizing proved that the nervous 
system was represented in the ‘‘limb’’ in the typical way, viz. 
by two lateral nerves. Without asserting it to be the case, the 
suggestion nevertheless occurs to one that a new individual 
It has already been remarked that no trace of reproduc- 
tive organs could be found; it must be concluded therefore 
that fission in some form occurs, at any rate at some period. 
Planaria salina, n. sp. (Pl. xxvi, figs. 5 & 6.) 
his species was collected in saline water near et-Tabghah. 
on an average 
25mm. and 1 mm. in length and breadth reapece Yo s 
largest was 3-2 mm in length and 1 mm. in breadth, were of 
smallest attained only a length of 1:6 mm. and a breadth o 
‘8mm. 
In colour they are distinctly pale; 
b 
The short head is typically —— and preg i ern 
: i a neck; 
k, with no oe just behind the 
head, but it can scarcely be called a neck in the same sense ae 
in the previous species. 
rounded anteriorly. : 
e eyes sie a forward position in the body, though 
