RODKNTIA SCIURINAE ARCTOMYS MONAX. 341 



The feet are rather large, the palms and soles entirely naked ; the latter from the heel and 

 well wrinkled. There are five callosities on the palm three anterior, and two posterior much 

 larger. Of the former, the outer ones are situated at the base of the outer (longer) fingers ; 

 the central one between the hases of the two central long toes, (third and fourth.) This is 

 largest and as if formed by the confluence of two situated like the others. On the soles there 

 are six callosities or tubercles four anterior over the bases of the toes, except the third, which 

 is larger, and between the bases of the third and fourth. The two posterior are very low and 

 scarcely appreciable. 



The thumb of the hand or fore foot is excessively rudimentary, like a mere wart, and would 

 be scarcely appreciable but for the broad, short nail, with its subjacent pad. The fore claws 

 are considerably longer trfan the hinder ones. In the hand, the claw of the third finger projects 

 furthest ; the fourth comes next, reaching nearly as far as the third ; the second is a little 

 shorter. The claw of the fifth extends as far as the end of the fourth finger. 



The second and third toes of the hind foot, with their claws, are about equal and longest ; 

 the fourth is a little shorter. The claws of the first and fifth do not quite reach the last 

 articulation of their adjacent toes. The tip of the claw of the first toe extends about as far as 

 the middle of the fifth claw. There is a slight web at the base of the fingers and toes. 



On slightly everting the anus (of the male) there are visible, just within its inner edge, three 

 glandular papillae one anterior, and two lateral themselves capable of considerable protrusion 

 (one-fourth of an inch) by eversion, when they are conical, and white and like the teats of a 

 cow. During life these may frequently be seen in a state of constant protrusion and retraction, 

 at first sight giving the impression of large ascarides. These appear to secrete a thickened 

 matter, white, and of a slightly offensive smell. 



The stomach is simple, shaped much like that of man ; the coecum is very large and full, in 

 shape and size not dissimilar to the stomach ; no partitions distinguishable. The gall bladder 

 is distinct. 



The predominant color of the outer surface of the hair of the specimen is a lustrous deep black, 

 especially on the hinder part of the back and belly, the tail, legs, the nape, and top of the 

 head. On the shoulders, sides of the body and neck, cheeks below the eyes, whole under parts, 

 except posteriorly, there is a strongly distinct hoariness, caused by a subterminal space of silver 

 grayish white, which, on the under parts of the body and legs, passes gradually into a brownish 

 chestnut, (the mesial line of the belly lighter.) There is also a distinct ring of whitish round 

 the muzzle, the posterior edge of which is about half way between the eye and nostril, or 

 perhaps the muzzle may be described as grayish white, excepting the extreme end, which is 

 black. 



The above remarks respecting color apply, however, exclusively to the long coarse hairs. 

 Tiie intermediate soft hairs are generally of a dark plumbeous black at the base, and of a tinge 

 of whitish at the tip, varying with the region from light brownish to dull gray, through chest 

 nut, darkest towards the ends of the hairs. The chestnut tinge predominates on the posterior 

 half of the body. On the sides of the body, anteriorly, these hairs are more annulated, there 

 being a second dark bar separated from the basal one by a somewhat lighter one, making four 

 rings, the terminal one again almost divided into one grayish and one reddish white. The 

 basal fur on the belly is, however, very scant and mostly black. The hairs on the tail are 

 entirely black. The incisors arc white. 



Another specimen, from the same litter in all probability, differs in having all the long hairs 



