176 Proceedings of the Royal Physical Society. 



Hoeven's Genus Stenops, are inhabitants of Asia, the East 

 Indies, &c. Van der Hoeven, in his description of this 

 species, the Stenops potto or Aposou, says — " The Aposo or 

 Aposou of the negroes of the Gold Coast of Guinea is a noc- 

 turnal animal, which sleeps on trees and lives on fruits. The 

 spinous processes of the last five cervical and of the first two 

 dorsal vertebrse are long, and pierce through the hairy in- 

 tegument of the back, with a weak, horny covering. Professor 

 Halbertsma first drew my attention to this peculiarity, which 

 I have observed in two specimens." 



On referring to the description of this same species (the 

 Potto), placed under the Genus Perodiclicas, and named 

 P. Geoffroyi, by Mr E. T. Bennett, which is published in 

 the " Proceedings of the Committee of Science of the Zoo- 

 logical Society of London," for 26th July 1831 (Part I., 

 1830-31). I find the animal now exhibited agrees with 

 the general characters given there of the Genus (correcting 

 the mistake of considering the projecting teeth in the front 

 of the lower jaw as being all incisors, instead of both inci- 

 sors and canines, according to the present view; and there- 

 fore the incisors only four in number, and not six,, as Mr 

 Bennett described them). To which I would add, as addi- 

 tional characters of the Genus Perodicticus — tail short, or 

 very short; index of hand very short, resembling an un- 

 armed tubercle — supported by small metacarpal bone, and 

 only TWO small phalanges. The Angwdniibo seems to differ, 

 however, from the details given of the species which he 

 describes, — the measurements of the Potto, or P. Geoffroyi, 

 given by Bennett, being, " length of head 2 inches and T 2 oths, 

 of the body 6 inches ; of the tail 1 inch j^-ths, or, including 

 the hair, 2 inches i 3 oths ;" whereas, in my specimen, the whole 

 length, from point of muzzle to extremity of tail, is about 

 10J inches ; the tail being only J of an inch in length, or, 

 including the hair, which is about J of an inch long, only \ 

 an inch. The animal described by Bennett was immature, 

 its dentition not being perfect ; in the one now exhibited, 

 the dentition is perfect. There seems to be other slight dif- 

 ferences between the Potto and the Angwdntibo, in the 

 colour of the hair as well as in the relative size or propor- 



