56 Zoological Society. 



where the tail is coloured like the body, all the hairs are black, 

 broadly annulated with white, and the white on the upper surface 

 forms bars or rings ; these however become indistinct towards the 

 apex. The ears are of moderate size and rounded. The heel is 

 rather sparingly clothed with hair. 



The skull of this animal is remarkable for its oblong-ovate form, 

 and for having the ant- orbital foramen further back than usual ; it 

 opens indeed directly into the anterior root of the zygomatic arch, 

 and is not in the form of a longish canal, such as we observe in other 

 Squirrels. The nasal portion of the skull is short and broad, and the 

 nasal bones correspond ; the elongated form of the cranium is due 

 to the greatly produced hinder portion : the antcro-posterior extent 

 of the extremely oblique bony plate forming the anterior root of the 

 zygomatic arch is great : the post-orbital process is well-developed : 

 the palate terminates very nearly in a line with the hinder part of 

 the posterior molars. The incisive foramina are moderate. The au- 

 ditory bullEe are rather small. The incisors are strong and very deep 

 from front to back. The molars are small in proportion to the skuU. 

 The dimensions of the skull are, 



in. lin. 



Total length 2 10 



Greatest width 1 6^ 



Width between orbits 10^ 



Length from post-orbital process to occiput 1 4 



■ of palate 1 2 



from front of the incisors to the first molar. ... Oil 



Longitudinal extent of the four molars 6 



Length of nasal bones 8| 



SciURTJS RUFO-BRACHiATUS. ScpiUs mediocrith' loiigis , subriyidis, 

 nigro et flavescenti-pcnicillatis ; corpore subtus sordide flavo vel 

 riifescenti-flavo ; ar tubus infra rufis ; caudd lonyd, von valde floc- 

 cosd, annulis nigris et albis, vel flavescenti-albis, ornatd, ad basin 

 plerumque rxifescente ; auribus parvulis ; dentibus incisoribus Ion- 

 gitudinuliter subsulcaiis. 



unc. lin. 

 Longitude ab apice rostri ad caudas basin. ... 86 



. caudcB 10 6 



tarsi diyitorumque 2 1^ 



auris 4^ 



Hab. in Insula Fernando Po. 



This species approaches very nearly to the Sciurus annulatus of 

 authors, but is distinguishable by its richer colouring. The general 

 tint of S. annulatus might be described as yellowish grey, whilst that 

 of the present animal is rusty grey ; and especially by the bright 

 rust-like tint of the under side of the limbs, and the pale rust or 

 rusty white colour of the belly. The heel is clothed with hair. 



The dimensions above given being from a skin, can only be re- 

 garded as an approximation ; judging from the skull, the present 

 species must be much larger than the Sc. annulatus. Its form is 

 nearly the same, but the nasal portion is narrower and more elon- 



