326 MR. W. H. FLOWER ON THE ANATOMY [DeC. 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 and D. hcs- 

 matobium (from Egypt), an adult Trichina spiralis. Taenia nana 

 (Egypt), 2\ coenurus, T. echinococcus, and the new Bothryocephalus 

 cordatus of Leuckart, from Greenland. 



The following papers were read : — 



1. Notes on the Anatomy of Pithecia monachus (Geoff.). 

 By W. H. Flower, Conservator of the Museum of 

 the Royal 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 Museum,' 

 torn. 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 novse, 

 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 Methodique de la Collection des Mammiferes du 

 Museum 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. irrorata 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 circumstance 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 Museum d'Histoire Naturelle. 



