M. A. C. Hinton — A Monkey's Bone from the Forest-Bed. 441 



radius, and internally against' a longitudinal ridge developed towards 

 the outer side of the sigmoid articulation of the ulna. Although very 

 little remains of the shaft, there is sufficient to show that the fossil 

 bone belonged to an at least nearly adult animal, all traces of the 

 epiphysial suture being obliterated, and also to determine what is 

 more important, viz. that there is no supratrochlear foramen. The 

 epitrochlear process is mutilated, but enough remains to show that it, 

 as well as the epicondylar process, are comparatively slightly developed 

 for a monkey ; and these features, together with the rather great 

 convexity of the capitulum — suggestive of a slight degree of flexion 

 of the fore-limb — indicate a species little given to climbing. The 

 groove for the ulnar nerve is very clearly defined (Figs. 2 and 3), and 

 the articulation is rather stout from before backwards (Fig. 2). 



A careful comparison with the humeri of recent monkeys preserved 

 in the British Museum and in the College of Surgeons shows that in 

 all the characters above mentioned the fossil agrees with the larger 

 members of the genus Macacus, and that it disagrees in one or other 

 feature with every other genus. 



The appended table of measurements will afford an idea of the 

 relations subsisting between the fossil and the recent humeri as regards 

 size. In comparing the humeri of the recent species of Macacus with 

 each other, one sees great variations in the form of the articulation 

 and of the epitrochlear and epicondylar processes, no two species, 

 judging from the limited material before me, having these parts pre- 

 cisely alike. The comparison further shows that the fossil humerus 

 has characters of its own, which will be best appreciated from the 

 figures. It will suffice to state here that, judging from the variations 

 seen in the recent species of Macacus, our fossil is by no means an 

 extreme form, that it makes a nearer approach to M. inuus in some 

 respects and to M. rhesus in others perhaps than it does to any of the 

 other species, and that it differs from them far less than, for example, 

 M. sinicus does. 



Pomel has described under the name of Macacus trarensis^ (and 

 later as M. proinuus ^) a species known from the limb skeleton alone, 

 obtained from a Pleistocene phosphoritic breccia at Traras, near Am 



1 Pomel: Comptes Eendus, cxv, p. 157. 



* Pomel: Carte Geol. Algerie, Monog. Pal., 1897, pi. iii. 



