Zooloffical Society. 475 



also afford a very distinctive character ; the lower incisors are twice 

 as long as in the last species, the upper not much longer than the 

 lateral, and the canine only half the size of the contiguous incisor, 

 and nearly in contact with it, being separated only by the third part 

 of a line ; the tail is furnished with an erect crest of black hair for 

 three or four inches towards the tip : this is the " Potoroo" of the 

 French Zoologists, as Mr. Ogilby had verified by comparison with 

 the Paris specimens. 



Mr. Martin then brought before the notice of the Meeting three 

 species of Chameleon from Fernando Po, forming part of Mr. Knapp's 

 donation, and upon which he proceeded to offer the following obser- 

 vations. 



" Among the collection of specimens from Fernando Po lately pre- 

 sented to the Zoological Society are three chameleons of peculiar 

 interest. One of them is the Cham, tricornis, or Oweni of Mr. Gray ; 

 the second is the Cham, cristatus of Mr. Stutchbury, described and 

 figured in the 3rd Part of the 17th Vol. of the Linn. Trans. The 

 third ajjpears to me to be undescribed. 



" With regard to the specimen of Cham, cristatus, 1 may be per- 

 mitted to point out some trifling differences between it and the 

 figure given by Mr. Stutchbury, The crest ceases to be elevated 

 over the loins and base of the tail, degenerating into an acute ridge ; 

 whereas in the figure it continues for a considerable distance along 

 the upper aspect of the tail, and is as elevated over the loins as over 

 the chest. The tail is shorter in proportion in the present specimen; 

 the indentations which margin the casque are less bold and decided, 

 and the casque itself is less produced posteriorly. The dorsal crest 

 is supported by only ten spinous processes. The colour is slate gray, 

 with a yellow abdominal line, but without the orange and dark reti- 

 culated lines observed by Mr. Stutchbury in his specimen. Length 

 of head and body 3^ inches : tail, 2| inches. 



"As the specimen described and figured by Mr. Stutchbury came from 

 the river Gaboon, Western Equinoctial Africa, and the specimen be- 

 longing to the Zoological Society from Fernando Po, it is possible that 

 they may be examples of permanent varieties ; but I am rather in- 

 clined to attribute the difference to age or sex, or to both combined. 

 Mr. Stutchbury's specimen is probably an adult male ; that belonging 

 to the Zoological Society is a young female. The Cham. Oweni, Gray 

 {Cham, tricornis. Gray), differs from a specimen from Fernando Po, 

 (collected by Lieut. Allen) in the possession of the Society, only in 

 having the horns less developed. With respect to the species I regard 

 as undescribed, I beg to offer the following observations : — 



2k2 



