1889. J 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. Monticelh *. 



[Keceived May 18, 1889.] 

 (Plate XXXIII.) 



Thanks to the courtesy of Dr. A. Giinther I have been able to 

 examine the helminthological collection of the British Museum (N.IL), 

 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. Bud. 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 ; oesophagus short ; intestinal cseca long. 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. DisTOMUM VELiPORUM, Crcphn, in Wiegmann's Archiv, 1842, 

 p. 336, tab. ix. 



There are in the collection specimens of this species found in the 

 stomach (ct) of an Acanthias {vulgurisl) presented by Dr. Chapman, 

 (/3) of a Scymnus, sp., from Madeira, (y) of a Torpedo fairchildi from 

 Dunedin (New Zealand), presented by the Otago University Museum; 

 and in the body-cavity oiviRaja nasuta from Dunedin (New Zealand). 

 The Acanthias, Torpedo fairchildi, and Raja nasuta are new hosts 



1 Communicated by Dr. A. Giinther, V.P.Z.S. 



