PARENCHYMATA. 415 
M. Rudolphi, under the name of Ecurnosroma, makes a division of 
those species which have a slight tubercle or swelling, anteriorly 
armed with hocks *. 
Ho.ostoma, Nitz., 
Where one half of the body is concave, and so arranged as to act 
altogether like acup. Their orifices appear to be similar to those of 
Distoma. 
They inhabit certain Birds. One species is found in the Fox. In 
Potystoma, Zed., 
Or rather Hexastoma; the body is depressed, smooth, and furnished 
with six cups, arranged in a transverse line under the posterior mar- 
gin, The mouth appears to be at the opposite extremity. 
They have been found in the urinary bladder of Frogs, in the 
ovary of Woman, on the branchize of some Fishes }, and in the 
nasal cavity of certain Tortoises. 
CycLocoTyLe, Ofto, 
Where there are eight cups, forming an almost complete circle un- 
der the hind part of the body, which is broad; there is a small pro- 
boscis anteriorly. 
C. belone, Otto, Ac. Nat. Cur. XI, part II, pl. xli, f.2. The 
only species known; it is very small, and was taken on the back 
of the Belone vulgaris. 
There is another subgenus that approximates to Fasciola, which I 
have named 
Tristoma, Cuv. 
The body forms a broad and flat disk; on the posterior part of its 
inferior surface is a large cartilaginous sucker, which is only con- 
nected with the body by a short pedicle, and under its anterior mar- 
gin are two small ones, between which, and somewhat posteriorly, is 
the mouth. A circular ramified vessel, the nature of which it is dif- 
ficult to determine, is observable in the parenchyma of the body. 
T. coccineum, Cuv., a species more than an inch wide, and of 
a bright red colour, that attaches itself to the branchiz of variqus 
fishes of the Mediterranean, such as the Orthagoriscus, Xiphias, 
&e.f 
* The genus EcHtNosTomaA of Blainville. 
+ Polyst. integerrimum, Rud., pl. vi, 1—6, genus HEXATHIREDIA, Trentler;— 
P. pinguicola;—P. thynni, Laroche, Nouv. Bull. de Se., May 1811, pl. ii, f. 3, genus 
HEXACOTYLE of Blainville;—Pol. midas, Kuhl and Van Hasselt, Allg. Koust. en 
Latterbode, No. 6, and the Bullet. des Se. Nat. de Féruss., 1824, vol. II, p. 310. 
+ Lamartiniere found a similar but grey one on a Diodon near Nootka-Sound. 
Tt formed the genus CasPALa, Bosc., Nouv. Bullet. des Sc., 1811, and that of PHy.- 
LINE, Oken, Zool., pl. x. See Journ. de Phys., Sept. 1787, pl. ii, f. 4, 5. Wemay 
uuite to it the Tristoma elongatum, Nitzsch, or Nitscwia, Ber., Ac. Nat. Cur., 
XIII, pars II, tab. XXXII, f. 1—5. The AxtNe of the Belone, Abild., Soc. Nat. 
Hist. Copenh., If, p. 2, pl. vi, f. 3, appears to be a Tristoma, with an extremely 
elongated body, very large posterior suckers, and very small anterior ones. 
