326 MR. W. H. FLOWER ON THE ANATOMY [ Dee. 9, 
December 9, 1862. 
E. W. H. Holdsworth, F.L.S., Esq., in the Chair. 
Dr. Cobbold exhibited a series of microscopic preparations of rare 
Entozoa, which he had just received from Prof. Leuckart, of Giessen. 
Among the more remarkable were Distoma heterophyes andeD. he- 
matobium (from Egypt), an adult Trichina spiralis, Tenia nana 
(Egypt), 7. eeenurus, T'. echinococcus, and the new Bothryocephalus 
cordatus of Leuckart, from Greenland. 
The following papers were read :— 
1. Nores on THE ANaATomy oF PitHEciA MONACHUS (GEOFF.). 
By W. H. Frower, Conservator OF THE MusEUM OF 
THE Royau CoLLeGE OF SURGEONS. 
(Plate XXXVII.) 
I confess to some hesitation in giving the above specific name to 
the subject of the present communication, as the original description 
of the species (Tableau des Quadrumanes, ‘Annales du Muscum,’ 
tom. xix. 1812) is too brief for satisfactory identification, and I have 
had no opportunity of examining the type specimen in the Paris 
Museum. It is exceedingly like the Pithecia irrorata of Dr. J. E. 
Gray, described and figured in the ‘ Zoology of the Voyage of the 
Sulphur’ (1842), part 1, p. 14, of which the type is in the British 
Museum, and which differs from the previously described P. hirsuta 
of Spix (Simiarum et Vespertiliorum Brasiliensium Species novee, 
1823, p. 14, and plate 9) in wanting the short, bristle-like, whitish 
hairs on the cheeks ; but as the present specimen agrees in this respect 
with Spix’s species rather than Gray’s, I have little doubt that it 
ought to be referred to the former, if they are distinct. 
In the ‘ Catalogue Méthodique de la Collection des Mammifeéres du 
Muséum d’Histoire Naturelle de Paris,’ 1851, by M. Isidore Geof- 
froy Saint-Hilaire, there is but one species with which, as far as can 
be ascertained by the short specific characters there given, it agrees ; 
and this is the P. monachus of the elder Geoffroy ; and as the learned 
author of the catalogue has satisfied himself as to the identity of this 
species with P. hirsuta of Spix, it becomes necessary to discard the 
latter name, and retain the one which has the priority of date. 
The dimensions of my specimen are rather inferior to those assigned 
by Spix to P. hirsuta, and to those of the examples of P. ¢rrorata in 
the British Museum ; but it must be considered that it is a scarcely 
adult female, and at the time of death was in extremely poor condi- 
tion, which last cireumstance may also account for the hair, especially 
on the tail, being less crisp and curled than in the above specimens. 
It also seems to differ from them somewhat in the relatively greater 
length of the tail*. 
* Since writing the above, the skin was taken to Paris by my friend Dr. Mur- 
chison, and, with the valuable assistance of M. Pucheran, compared and pro- 
nounced to be identical with the specimens of P. monachus (including the original 
one described by Geoffroy) in the Muséum d’Histoire Naturelle. 
