July eal 
1909 ALLEN AND BARBOUR— A NEW MARSUPIAL 45 
region is slightly swollen dorsally, making the frontals nearly parallel- 
sided. The rostrum is distinctly compressed, and the nasals are roundly 
expanded at their posterior extremity. There are two pairs of irregular 
palatal vacuities; the anterior pair lies about opposite the first premolar, 
the posterior, more rounded, pair is opposite the point of contact of the 
first two molars. Palate is nearly straight across, with a slight median 
projection posteriorly. 
The dental formula, allowing for the loss of two upper molars on each 
side, is: I$, C+, P3, M4. Of the four upper incisors, which are of the usual 
compressed or laterally flattened type, the first is smallest, and somewhat 
rounded in outline; the two incisors following are rather squarish, sub- 
equal, the posterior slightly the larger; the fourth upper incisor has a 
portion of the root exposed, but the crown is slightly smaller than that of 
the third (this is not correctly shown in the figure). A diastema of about 
1.4 mm. separates the weak and slightly recurved canine from the incisors, 
and a second diastema of 1 mm. intervenes between the canine and the 
premolars. The first upper premolar is slightly smaller than the second, 
triangular, and with an anterior cingulum cusp; the second premolar has 
in addition a posterior cingulum cusp. The third upper premolar is a 
minute tooth, at the outer side of the tooth row, in the angle between the 
second premolar and the first molar; it scarcely projects beyond the cingu- 
lum cusp of the preceding tooth. The first two upper molars are subquad- 
rate in section, narrowing internally, with four sharp triangular w-shaped 
cusps and an internal basal ledge that is produced into a strong cusp at its 
antero-internal edge, and a much smaller cusp at its posterior, narrower 
portion. 
The lower incisors are compressed and proclivous, the third provided 
with a small rounded cusp at the posterior end of the crown. The canine 
abuts closely against the third lower incisor, which it equals in height; its 
crown is triangular and about as large as that of the preceding tooth. A 
small diastema separates it from the premolars, of which the first two are 
subequal, large and triangular. The third premolar is a minute spicule, 
scarcely appreciable without a lens. It is about one third the height of the 
first molar and is practically in the tooth row, though apparently forced a 
little to the exterior. The first three lower molars are somewhat rectangular 
in outline, with five prominent cusps. The fourth molar in each ramus 
has been lost in cleaning, though its cavity is present. 
Measurements.— The dried skin presents the following dimensions, in 
millimeters: total length, 162; tail, 33; hind foot, 33; naked rhinarium, 8. 
The skull measures: approximate length, 48.; basal length, 45.5; palatal 
length, 22.; incisive foramina, 4.; median length of nasals, 14.; tip of 
premaxillaries to orbit, 18.4; zygomatic breadth, 19.; mastoid breadth, 
14.5; interorbital breadth, 10.8; length of upper molars, 1.2 to 7.6; mandi- 
ble, 2.9. 
