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REPORT ON ZOOLOGY, MDCCCXLII : 
motions of the animal, were bulged out and in. He proposes to call this 
worm Tetrarhynchus cysticus, or Echinococcus corollatus. It is at all 
events a young Tetrarhynchus, and on this account need not have been 
arranged in a ditferent genus ; the specific name selected by Mayer 
should have been fitting, for many Tetrarhynci are found encysted. 
Steenstrup doubts (Op. ant. cit. p. 113) if a Tetrarhyncus, according to 
Miescher’s account (v. Arch. 184:1, ii. p. 301) can proceed from a meta- 
morphosis of the Fila/ria piscium, as the tubular and club-shaped cover- 
ings which harbour a Tetrarhyncus, and which he has often found in 
Esox belone, though they certainly on the surface resemble a Filaria, 
yet have nothing common in structure with that worm. 
Duvernoy has mentioned, under the name of Bothrimonus sturionis, 
a new parasite, belonging to the Cestoidea, which was found by Lesueur 
in the intestinal canal of the Acipenser oxyrhynchus, Mitch. (Ann. des 
Sc. Nat. t. 18, p. 123, and Froriep’s Neue Notiz. Bd. 24:, p. 134:). It 
makes a transition from Ligula to Bothridium. There is no membering 
of the body, on the middle of which a furrow runs down both surfaces ; 
in these two furrows are situated a multitude of small elevations, pro- 
vided with an opening ; sometimes, instead of one elevation, there is an 
oblong cirrus-like papilla, and close behind it a second opening. These 
parts, which Duvernoy only properly recognised upon one (the abdo- 
minal) surface, are perhaps nothing but sexual pores, and Creplin was 
right, when he declared the presence of such pores on the dorsum of the 
animal an illusion (Fror. Neue Notiz. Bd. 24, p. 136). The globular 
head is furnished with two acetabula, standing close together, or rather 
soldered to each other, which Duvernoy saw situated on the dorsal side 
of the head of the worm ; the posterior end was bluntly rounded or cre- 
nated outwardly ; this last probably only occurred from an injury. 
A comparison has been made by Creplin (Arch. 1842, i. p. 315) be- 
tween Taenia expansa and denticulata, and attention particularly 
directed to the latter, with which the former has been often confounded, 
as both at the same time inhabit the intestine of bullocks. 
CYSTICA. 
In the treatise of Steenstrup, already so often mentioned, he enumerates 
also the encysted worms as animals, which perhaps are generating 
matrices, of which, as yet, the complete animals are not known (Op. 
ant. cit. p. 111). 
R. Froriep, in a treatise entitled “ Hydatides ossium,” has communi- 
cated a case of the presence of the Cysticercus cellulosce in the first 
phalanx of the middle finger of a man (Fror. Chirurg. Kupfertaf. Hft. 87, 
1842), and also two cases of hydatids in human bones ; from which he 
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