Prof. W. H. Flower on Extinct Lemurina. 327 



he considers to be a true Lemuroid, more nearly resembling 

 Galago setiegalensis than any other existing species. Unfor- 

 tunately, as in both the other examples, the anterior part of 

 the face is so much injured, that the characters and number of 

 the incisor teeth cannot be ascertained. This is a great want 

 in determining the true affinities of these animals, as the 

 condition of the incisors is very characteristic of all modern 

 Lemurs. M. Filhol assumes that there are but three pre- 

 molars above and below in Necrolemur, and that it presents 

 therefore a much closer resemblance to the true Lemurs than 

 to his Pachylemurs ; but I do not see (judging only by the 

 figures which he gives) why the first tooth present should not 

 be a premolar as well as a canine, in which case the dental 

 formula would be the same in both ; and otherwise it appears 

 to me that the three heads he figures [Necrohmur anti'quus, 

 Palceolemur BetiUei\ and Adajns magnus) form a natural series, 

 the first standing to the second very much in the same relation 

 of proportions &c. as this does to the third. This is particu- 

 larly well seen in the upper surface, where the temporal crests 

 are separate as far back as the occiput in the little Necro- 

 hmur^ unite about the middle of the parietal region in Palceo- 

 lemur, and in the frontal region in Adapts mag mis. Similar 

 differences are found among existing members of closely 

 allied forms, in the Carnivora, Insectivora, and even the 

 Lemurs themselves. I therefore do not think that M. Filhol's 

 conclusion that Necrohmur is to be regarded as an early Mio- 

 cene Lemurine, only generically separated from Galago or 

 Hapalemur, while Ada-pis is a representative of a totally dis- 

 tinct zoological type, is admissible. Such evidence as is before 

 us leads to the supposition that all three are nearly related 

 primitive Lemuroids ; but, in the absence of all knowledge of 

 the structure of the limbs, their position cannot be satisfactorily 

 determined. 



The recognition of some of the supposed Ungulates of the 

 Paris gypsums as Lemuroids shows how little reliance can be 

 placed upon the characters of the molar teeth alone in judging 

 of the affinities of an animal, and must also lead to the re- 

 examination of some of the smaller mammals of our own 

 Tertiarics, such as MiolopJaiSy as it is not improbable that 

 Lemurs may be found among them. 



Perhaps the most important of all the numerous recent 

 palaeontological discoveries in the Tertiary beds of the Rocky- 

 Mountain district of North America has been that of animals 

 which their describers believe to be low and generalized forms 

 of the order Primates. Their existence was not suspected till 



