970 MR. ST. GEORGE MIVART ON THE LEMURID^. [DeC. 12, 



a rudimentary postero-internal cusp. There is also an external cin- 

 gulum. Perhaps, however, the molars may be better described as 

 consisting each of three cusps (one internal and two external) con- 

 nected by ridges, and supplemented externally by a cingulum, and 

 internally, except the last one, by an internal cingulum placed be- 

 hind the internal cusp and resembling a postero-internal one. 



In the lower jaw the incisors and canines have the form and ar- 

 rangement common in the LemuridcB. The first lower premolar is 

 very large and caniniform, but with a strongly marked process pro- 

 jecting from its anterior margin. The second and third lower pre- 

 molars are exceedingly like the second lower premolar of Indris la- 

 ni(/er (see P. Z. S. 1866, p. 157. f. 4). Each has only one external 

 cusp. * 



The first two lower molars consist each of two internal and two 

 external cusps, with a rudiment of a median fifth posterior cusp. 

 The antero-external cusp is considerably larger than, but not so high 

 as, the antero-internal cusp. The postero-internal cusp is much 

 smaller than the external one. 



The last lower molar is nearly similar to the two teeth in front of 

 it ; only the fifth cusp has become very large and distinct. 



Its tarsal structure is unknown to me ; but the tarsus appears to 

 be but little elongated. 



As to the affinities of Lepilemur, it is, I think, impossible to say 

 that it has any marked relationship to any other genus. Perhaps, 

 as MM. Gervais, Schlegel, and Pollen concur in remarking, it 

 rather approximates to Hcq^alemur than to any other form. The 

 production of the anterior margin of the first lower premolar, as also 

 the form of the two following teeth, recalls to mind (as has been said) 

 the teeth of Indris laniger. 



The structures exhibited on. the one hand by Lepilemnr, and on 

 the other by C. furcifer, render necessary some slight changes in the 

 characters before given of the groups to which they are allied. 

 Thus, if the genus Lepilemur is to form part (as I think it must) 

 of the subfamily LemurincE, it will be necessary to expunge from the 

 characters of that group the non-iiijiaiion of the mastoidal region^, 

 and the characters of Lepilemur, Vheiroyuleas, and Microcebus will 

 be as follows : — 



Lepilemur f. 



1. •, C. 1^;, P.M. 2E|, M. S, =11=32. 



Tail shorter than the body ; muzzle longer than the orbit ; first 

 upj>er premolar more vertically extended than the others ; premolars 

 with oidy one external cusp ; last lower molar with a large fifth cusp ; 

 praemaxillae very small ; an interparietal bone ; palate very short ; 



* P. Z. S. 1864, pp. 638 & 639. 



t Isid. CI. St.-Hil. Cat. des Prim. p. 75; Dalilb. Studia Zool. p. 220; Gray, 

 P. Z. 8. 1S6;>, p. 144; Wagner, Schreber, Supp. v. p. 147; St. Geo. Mivart, 

 P. Z. S. 1864, pp. 623 & 642; A. Grandidier, Eev. Zool. July 1867, p. 256; 

 Pollen and Sclilegel, Eech. sur la Faune de Madagascar, p. 10, pi. 4. 



