1889. | ON ENTOZOA IN THE BRITISH MUSEUM. 321 
the ape is always able to perceive this distinction (she will search 
long and patiently for a straw of any colour when told that it occurs 
somewhere in the general litter of white straws constituting her bed, 
and eventually pick it out), while she cannot be taught to distin- 
guish any of the others, I conclude that her failure in this respect is 
not due to any want of intelligence, but to some deficiency in her 
powers of colour-perception. 
2. Notes on some Entozoa in the Collection of the British 
Museum. By Fr. Sav. Monticetur’. 
[Received May 18, 1889.] 
(Plate XX XIII.) 
Thanks to the courtesy of Dr. A. Ginther I have been able to 
examine the helminthological collection of the British Museum (N.H.), 
and to study closely the typical specimens of von Siebold and Baird 
which are contained therein. On the present occasion I shall merely 
make some remarks upon a few of the more interesting new species 
or such as are not well known. Other observations I hope to embody 
n a larger forthcoming paper. 
TREMATODA. 
1, AMPHISTOMUM TRUNCATUM, Rud. Ent. Syst. pp. 91 et 389. 
I have found many specimens of this species taken from the 
intestine of a Phoca vitulina. My observations enable me to 
complete the description as follows :—Body elliptical, compressed or 
cylindrical, according to the state of preservation, with posterior 
extremity obtusely truncated and covered by fine spines, which in 
the anterior third are large, become gradually smaller in the middle 
third, and invisible in the posterior third. 
Posterior sucker large, rounded, very prominent; pharynx of 
moderate size ; cesophagus short ; intestinal czecalong. The genital 
antrum placed in the anterior part of the body and surrounded by 
an elevated edge; it resembles a sucker ; testes large and occupying 
the posterior part of the body ; ovarium small, and uterus not much 
extended. Vitellaria disposed laterally and limited to the middle 
part of the body ; vagina opening dorsally. 
2. Disromum VELIPoRUM, Creplin, in Wiegmann’s Archiv, 1842, 
p- 336, tab. ix. 
There are in the collection specimens of this species found in the 
stomach (a) of an Acanthias (vulgaris?) presented by Dr. Chapman, 
(3) of a Scymnus, sp., from Madeira, (vy) of a Torpedo fairchildi from 
Dunedin (New Zealand), presented by the Otago University Museum; 
and in the body-cavity of a Raja nasuta from Dunedin (New Zealand). 
The Acanthias, Torpedo fuirchildi, and Raja nasuta are new hosts 
1 Communicated by Dr. A. Ginther, V.P.Z.S. 
