Vol. IX, No. 11.] The Planarians of the Lake of Tiberias. 463 
[N.S.] 
form of the auricular sense organs are quite unlike those of this 
species. 
EXPLANATION OF PLATE XXVI. 
Figures 1, 5 and 7 were drawn by the aid of Bausch and 
Lomb’s projection drawing apparatus ; figures 2, 3,4 and 6b 
camera lucida. 
Fic. 1.—Planaria tiberiensis as seen when cleared in cedar- 
wood oi E 
> 
nlarged 12 times. 
2.Form of head in same species, showing position and 
form of auricular sense organs (a. s. 0.) Enlarged 
20 times. 
3.Form of the head of a young specimen of the same 
species. Enlarged 16 times. 
4.—Bifurcated caudal region of a specimen of the same 
species showing the course of the gut in the branch 
(to left of figure) ; ph. pharynx; g. gut; s. subsidiary 
lobe; m. main trun 
5.—Planaria salina as seen when cleared in cedar-wood 
il. Enlarged 16 times. 
6.—Outline of another specimen of same species. 
7.—Head region of Pianaria barroisi as seen when cleared 
in cedar-wood oil. Enlarged 12 times. 
