1863.] DR. J. E. GRAY ON THE SPECIES OF LEMXJROIDS. 131 



Daubentonia, will come to the conclusion that in the zoological series 

 the Aye- Aye (Daubentonia) is properly placed with the Lemuroid 

 Mammalia, and that the genus Tarsius, by the disposition and the 

 form of the teeth and by the length of the fingers, forms the link 

 which explains the peculiarities of this otherwise apparently anoma- 

 lous animal. 



Fani. I. Lemurid.e. 



Cutting teeth ^ or ~ ; the upper far apart ; the lower com- 

 pressed, shelving forward, the two outer larger, opposed to the space 

 between the upper cutting teeth. The fingers and toes free, well 

 developed ; the first hind toe shorter, with an elongate curved claw. 



Believing that the form of the head and size of the eyes, which 

 indicate the extent of the nocturnal habits of the animal, are of more 

 importance than the mere length and slenderness of the foot, I have 

 proposed the following arrangement of the genera. 



I observe that the length of the ears varies considerably in what 

 are in other respects very nearly allied species, and that the ears 

 are very often distorted in the stuffed specimens — so much so that 

 a species may sometimes be said to have a long ear, while if ob- 

 served alive it would be regarded as only having a moderately de- 

 veloped one; for the ears are often unduly stretched by the stuffer, 

 and the form entirely destroyed ; and in some cases they are as much 

 shrunk by not being attended to when the skin is dried. This is 

 important, as sometimes the species, or even a genus, has been de- 

 scribed from a living specimen or from an animal preserved in 

 spirits, and at others from a more or less well preserved or stuffed 

 skin ; and it is this difference of state that renders the recognition 

 of the animal so difficult, and has caused so many synonyma. For 

 these reasons I have united together into one group some of the 

 genera of the smaller species which have been separated on slight 

 differences in the apparent development and size of the ears. 



I propose to arrange the genera as follows : — 



I. The head elongate ; face developed ; eyes moderate ; hind legs 

 elongate ; fingers well developed, normal. 



* Teeth 30 ; hind foot very short ; great toe long. Indrinina. 



1. Indris. Tail none. 



2. Propithecus. Tail elongate. 



** Teeth 36 ; tail elongate ; great toe broad. Lemurina. 

 a. Feet short ; ears moderate. 



3. Varecia. The head surrounded by a ruff ; ears tufted. 



4. Lemur. Head, without any ruff; wrist with a narrow bald 

 line and pad above. 



5. Prosimia. Head without any ruff; ears externally hairy; 

 wrist hairy. 



