304 
REPORT ON ZOOLOGY, MDCOCXLII : 
of tlie back. These little balls appear blackish coloured when the light 
falls through them, and white when it falls on them. 
Distomum hepaticum has been found by Duval in the vena portarum, 
and its hepatic branches, of a man, to the number of five or six indivi- 
duals, from 11-14'" long, and 4-5'" broad (Gaz. Med. de Paris, 1842, 
No. 49, and Zeitschr. f. die gesammte Mediz. v. Oppenheim, Bd. 23, 
1843, p. 86.) 
A Distomum, discovered by Otto in the Squalus griseus, has been 
more correctly described by Creplin as Dist. veliporum (Arch. 1842, 1, 
p. 336). Its size is somewhat above three inches. The abdominal ace- 
tabulum lies very far forward, so that the neck is only 3'" long ; on the 
middle of the latter the genital pore projects, like a little hiUock. The 
excretory pore is distinctly placed at the end of the after part of the body. 
Creplin remarked, in that part of this animal, three broad bluish spots, 
situated behind each other. The two posterior evidently proceeded from 
the two testes, the third and foremost led from the organ of egg-germi- 
nation, which the reporter has not yet missed in any Trematoid worm. 
The eggs of this Distomum are very small, slender, roundish, oval, and 
brown coloured. 
A new parasite has been found by Leuckart in the frontal sinus and 
labyrinth of the cribriform bone of Mustela putorius (Zool. Bruchst. 
iii. p. 33) which he has described in the following way : — Corpore 
tereti, ovato, antice crassiore, rotundato-obtuso, postice attenuate, acute ; 
poris orbicularibus, poro antico parum prominente, poro ventrali 
majore ; collo nullo. Its length was I^'", its colour brown. He also 
discovered another Distomum in the kidneys of Soreoo fodiens (ibid, 
p. 34). He calls it Dist. truncatum, and gives the following diagnosis : 
— Corpore tereti, antice crassiore, rotundato-obtuso, postice attenuate, 
truncato-obtuso ; poris remotis, poro antico orbiculari, non prominente ; 
poro ventrali minore, apertura transversa; coUo nullo. Its length was 
2'", and it was also of a brown colour. 
Gluge observed, in the Polystomum integerrimum, a number of cells 
with nuclei and nucleous bodies, some of which were again enclosed in 
cells (Hacser. Arch. f. die gesammt. Mediz. 1842, p. 492) ; but he could 
not say if these cells had any relation with the development of the eggs. 
We learn from Yarrell, that twenty specimens of the rare parasite, 
Tristomum coccineum, were found on the outer upper surface of the 
head of an Orthagoriscus mola, caught on the English coast (Hist, of 
Brit. Fishes, ii. p. 468). 
Leuckart has characterized a new genus of Trematoda, under the 
name of Diplohothrium (formerly only provisionally called Diclihoth- 
rium) under the following diagnosis : (Zool. Bruchst. iii. p. 13) ; — Cor- 
pore molli, elongate, depresso ; acetabulis sex anterioribus, media val- 
vula in duas foveolas divisis, lateralibus, utrinque tribus ; rostro inter 
348 
