PLANARIA. 119 
when falling through the water. Dwells on the Flustra hispida, where 
it is not rare, in July and August. Marine. 
Piate XVI. 
Fic. 32. Planaria flustre, enlarged. 
€.—PLANARIA VORAX.—Plate XVI. Figs. 33, 34. 
Length an eighth of an inch, greatest thickness a third of the length. 
Body round, tapering downwards ; head obtuse, tail acute. No eyes 
visible. The mouth is apparently in front. The animal feeds readily on 
fish, and when replete, resembles an inflated vesicle, tapering downwards, 
the food occupying a capacious ovoidal stomach. 
From one to five ovoidal brown ova are lodged towards the posterior 
part. But none of those which were produced afforded any progeny. 
Two continued visible for twenty-four or twenty-five days in a specimen, 
when it perished accidentally. 
The Planaria vorax dwells in fresh-water marshes, along with the 
Planaria graminea, which it devours when dead. There is some corre- 
spondence between the figure and habits of both ; in them the anterior 
appears greenish. Numbers of each congregate together after a similar 
fashion, at the bottom of their vessel, where, also, the voraw prefers 
abiding, amidst mud and decaying vegetables. Rare. 
Prats XVI. 
Fic. 33. Planaria vorax. 
34. The same enlarged. 
f—PLANARIA GRAMINEA—The Grass Green Planaria. 
Having previously given several illustrations of the history of this 
species, I shall now restrict myself to a few observations made long after- 
wards, but for the repetition of which no recent opportunity has oc- 
curred. 
