Mr. 0. Thomas on two new Squirrels from Borneo. 127 



characters of the ambulacra and the development of 

 floscelles. 

 The new species may be defined in the following terms :— 



Nucleolites occidentalis. 



General form and habit very similar to that of N. eptgonus, 

 but the long axis of the elliptical anus is transverse, and there 

 is no periproctal groove ; the actinostome tends to be penta- 

 gonal, but is wider than long ; the test is not quite so wide or 

 so swollen posteriorly as in N. epigonus. 



The length of the single specimen is 1 7, and its greatest 

 breadth 13"5 millim. 



Curiously enough the single test is spineless and bleached, 

 and this (artificially, of course) heightens its resemblance to 

 N. epigonus, all known specimens of which are in the same 

 condition. 



Hab. Bahamas. 



In Coll. B. M. 



XIII. — Descriptioji of two new Squirrels from North Borneo. 

 By Oldfield Thomas. 



Among a collection of small Mammalia made by Mr. John 

 Whitehead during his recent successful expedition to Mount 

 Kina-Balu, and kindly submitted to me for examination, 

 there occur representatives of the two following new squirrels. 



Sciurus Whtteheadi, sp. n. 



Allied and very similar to S. exilis, Miill., but slightly 

 larger, and with the ears, instead of being rounded and short- 

 haired, narrow, pointed, and with beautiful long black-and- 

 white pencils of hair, nearly as long as the head, and standing 

 out conspicuously from the general grey of the body. A white 

 spot also present on the neck just behind the ear. Colour 

 elsewhere precisely as in S. exilis. Face without any trace 

 of the black-and-white markings characteristic of S. melanotiSj 

 Miill. & Schl. 



Skull very peculiarly shaped, with a short broad cranial 

 and a disproportionally long and powerful facial portion, the 

 distance from the tip of the nasals to a point between the 

 anterior edges of the orbits 12 "8 millim., as compared to about 

 10 millim. in S. exilis, and 11 millim. in S. melanotis, the 

 latter an animal with the cranial part of the skull as large as, 

 if not larger than, that of /S. Whiteheadi. 



