Prof. W. H. Flower 07i Extinct Lenuiniia. 325 



muscular ridges more developed than in any existing member 

 of the group. The occipital ridge is very marked ; and the 

 upper borders of the temporal muscles meet in the middle line, 

 forming a well-marked sagittal crest, as is the case with 

 Loris tardigradus and the larger Galagos, but not with the 

 Potto. 



The ramus of the mandible is considerably deeper and 

 stouter than in any existing form. The number of the molar 

 series appears to be j^- ^^ ^'^- fj the typical number in the 

 Eocene mammals, and therefore one more premolar than in 

 the existing Lemur i nee ^ and two more than in the Indrisince. 

 The upper molar teeth are of a much more simple and primi- 

 tive character than in existing Lemurs, being nearly equal in 

 size and having nearly square crowns, with four distinct 

 cusps, one at each angle, rather obliquely placed, the inner 

 ones behind the corresponding outer cusps, and with the trans- 

 verse or rather oblique connecting ridges but little developed. 

 The third molar has the postero-internal cusp rudimentary. ' 



In the mandible six teeth are preserved, the two in front 

 (pm. 2 and pm. 3) each with one cusp. In the third (pm. 4) 

 the cusp is broad and almost bifid, and the heel is so well 

 developed that it closely approaches a true molar in form. The 

 latter sliow very much the characters of the lower molars of 

 the smaller Lophiodons, having two pairs of obliquely placed 

 cusps, connected by ti^ansverse ridges, anterior and posterior, 

 with an oblique ridge running forwards and inwards from the 

 postero-external cusp. The last has an additional posterior 

 tubercle. This pattern of tooth, which is the foundation of 

 that of all the Perissodactyles, however modified, is also that 

 on which tliat of the existing Lemurs is based, and is retained 

 most clearly in the Tailless Potto [Perodicticus calabar ens is*). 



On the whole, then, it appears that the animal whose skull 

 was discovered at Bdduer was correctly assigned by Delfortrie 

 to the Lemurine group, though it cannot be placed in any of 

 the existing genera, and shows in all its cranial and dental 

 characters such modifications as might be expected in an 

 ancient form, being decidedly more generalized and lower than 

 any of the living Lemurs. Of these, however, it more nearly 

 resembles the Indo-African forms, and not those of the island 

 of Madagascar or of the extreme east, having no near relation- 

 ship with TarsiuSj Ghiromys^ or the Indrisince^ and not much 

 Avith the true Lemurs. If the bones of its feet could be found, 

 their structure would afford most valuable evidence of the 



* See Huxley, '' On the An;iwantibo {Ardocchua calaharemis),'' Proc. 

 Zool. Soc, .Tune 28, 1864. 



