Vol. IX, No. 6.] The Leeches of the Lake of Tiberias. 213 
[NV.8.] 
depth of tint in different individuals. As a rule small indivi- 
have seen large ones ied were quite pale. The blood is red 
and gives the living animal a pinkish tinge, the depth of 
which soot ha Sencadé ss on nthe degree of pigmentation of the 
integum 
My eee specimens, killed in “y oo condition, are 
35 mm. long by 3 mm. broad and 2 m. deep. In life they 
were flatter and, viet at a distinctly broader. 
Distribution.—Lake of Tiberias and neighbourhood; R. 
Barada. There are eit of this race in my collection 
from near Damascus and from several of the springs round the 
lake as well from the Lake itself, in which it is one of the 
commonest animals. 
Johansson and Rousseau both mention cases in which the 
stripes are faint or obsolete, but in Europe these are apparently 
aberrations. Dina absoloni of the former author entirely lacks 
pigment and is distinguished by the fact that the oe pores. 
are separated by three instead of five complete rings. 
Blanchard says (1893) that ‘‘ D. quadristriata’’ is ‘* littér- 
alement banale en Syrie.’’ This I can confirm from my own 
observations both at Tiberias and at Damascus. In = gen 
I took most of my specimens on the lower surface of s 
the edge, on one occasion finding no less than 23 individnale 
adhering to a single stone of not more than 15-0 sq. cm. in 
- area. In this position the food consisted mainly of small Oligo- 
chaeta, which were swallowed whole. A large but very pale 
individual was dredged from between 6 and 8 metres in the 
Jordan channel in the lake near Sema 
No other species of leech is actually known to inhabit the 
Lake of Tiberias, but Blanchard in recording the occurrence of 
‘Placobdella carinata (Diesg.) in one of the tributaries of the 
R. Orontes states that Barrois took a large number of speci- 
The list of Hirudinea known from the lake must, therefore, 
stand for the present as follows :— 
Fam. Glossiphonidae. 
1. Placobdella catenigera Peet et a eg 
2. ? Placobdella carinata (Diesing). 
Fam. Herpobdellidae. 
3. Herpobdella (Dina) lineata (O. F. Miller). 
though one of these species occurs in North Africa and 
even in localities outside the Palaearctic Region, they may all 
