PARENCHYMATA. 367 
I cannot help thinking that we should also approximate to 
Fasciola most of the animals contained in the genus 
Puanaria, Mull.(1) 
Although they do not inhabit other animals, but merely live in salt 
or fresh water. Their body is depressed, parenchymatous, and 
without a distinct abdominal cavity. The oral orifice, placed under 
the middle of the body, or more posteriorly, and dilated into a little 
proboscis, leads, as in Fasciola, to an intestine whose numerous 
ramifications are formed in the thickness of the body.’ A vascular 
network occupies the sides, and behind the alimentary orifice is a 
double system of genital organs. They also enjoy a reciprocal 
coitus. Small black points are observable, which probably are eyes. 
These animals are extremely voracious, and do not even spare 
their own species. They not only multiply in the ordinary man- 
ner, but are reproduced with great facility by division. They even 
experience spontaneous divisions. 
Several species inhabit the fresh waters in France(2). 
Others, and larger ones, are very abundant on the sea-coast 
of the same country(3). 
The surface of some seems pilose(4). 
Several are furnished anteriorly with two tentacula(5). 
M. Dugés separates from them the 
PRosToMa, 
Where the anterior extremity is provided with an orifice, and the 
posterior with another. 
(1) At the period of my first edition, it was by conjecture only that I placed the 
genus Planaria here, having no sufficient anatomical data to give me an idea of its 
natural affinities. Since then, the observations of MM. R. Johnson, Phil. Trans., 
' Dallyell, Monog., Ber., Ac. Nat. Cur., XIII, Dugés, Ann. des Sc. Nat., XV, and those 
made by myself; appear to confirm this classification, which has been adopted by M. 
de Lamarck. 
(2) Planaria lactea, Zool. Dan., CTX, 1, 2;—PI. nigra, Ib., 3, 4, and the other 
species described by M. Dugés, Ann. des Sc. Nat., XV, pl. iv. We findin Gmelin 
the long catalogue of this genus, which Muller particularly has enriched; part of 
this savant’s figures are copied in the Encyc. Méthodique. 
(S) Pl. aurantiaca, Cuv. 
(4) Pl. brocchit, Risso. 
(5) Pl. cornuta, Miill., Zool. Dan., XXXII, 5,7. Some of them are formed by 
tearing the tentacula, under the eye of the spectator. The Planocéres, Blainy., 
belong to this division. 
