34 
HORN EXPEDITION-MAMMALIA. 
Soles granulated anteriorly and in the median part. Four pads present, a 
small one at the base of the hallux and three larger ones at the base of the toes. 
The latter are faintly striated. 
Tail much longer than body. Very stout in its proximal part and strongly 
incrassated; very much stouter and more strongly incrassated than in S. crassi- 
caudata. Tapering to a long thin end. Strongly scaled, with at the proximal end 
short hairs, which do not hide tlie scales. ' Distally the hairs are more numerous 
and somewliat longer towards the tip. 
Dentition i. 
1.2.3.4 
1.2.3. ■ 
pjn. 
1.0.3.4 
iToXl' 
m. 
1.2.3.4 
1.2.:h4' 
Teeth as usual in the genus. Canines small, and the upper premolars increasing 
in size backwards. 
Dimensions. 
! 
Specimen a. 
Adult $ 
in al. 
Specimen b. 
Adult d' 
in al. 
Specimen c. 
Adult 
in al. 
Head and Body 
88 
85 
95 
Tail - - - - 
105 
95 
111 
Hind-foot ... 
18-2 
17-5 
18 
Ear - - - - 
14 
15 
16 
Width of Hind-foot 
4 
3-5 
4 
Habitat .—Central Australia, Charlotte Waters. Terrestrial ; burrowing. 
INIr. Byrne informs me that this species seems to prefer the stony table-lands, 
whilst S. crassicaudata prefers the softer ground near the creeks and amongst the 
sand-hills. 
The characteristic features of this form are (1) the remarkably long, stout and 
strongly-incrassated tail, and (2) the relative length and width of the hind-foot. 
There is no difficulty in distinguishing the animal from S. crassicaudata, which 
is frequently found in the same district. I have some thirty mature specimens 
of the latter, which all agree closely with one another in the relative dimensions of 
the body, and in none of which the tail is as long as the head and body, nor is 
there any approach to the great widening-out of the proximal portion which forms 
