MACRO PGDID.R. 
57 
interior islands of Brazil. Other Marsupial remains, in¬ 
cluding species of the present group, and also including 
some of the most distinct of the cavern species, have since 
been found by Sir T. L. Mitchell in the alluvial, or newer 
tertiary deposits, in the bed of tho Comlamino liiver, west of 
Morcton Bay ; and we arc indebted to Count Str/oleeki for 
further discoveries of raatnninliuu remains in the Wellington 
Valley caverns. Amongst tho specimens contained in those 
collections, which havo been presented partly to the Geo¬ 
logical Society, and partly to the Museum of tho Royal 
College of Surgeons 1 , are remains appertaining to about 
six or seven distinct species of Macropodidtr; some ap¬ 
proximate in size to the Macropus major , and with respect 
to these, ns well as others of small size, Professor Owen 
remarks, that from want of skeletons of existing species of 
Kangaroos, he must leave doubtful the specific determination. 
The following three species aro of very large size, and clearly 
differ from any of the hitherto-discovered large species. 
Macropus Atlas (fossil): Owen, in Mitchells Journal, fee. 
Yol. II. (2d E(L)p. 865,PI. -17, fig. I ; and in Owen's 
Odontography, PL 101, figs. 3 and 5. 
This species, Professor Owen observes, must have been at 
least one-third larger than the Macropus major: it is chiefly 
remarkable for the great size of the permanent spurious molar, 
in which respect it approaches the 11tjpsiprymni ; and, inas¬ 
much as tliis tooth wants the external vertical grooves, and 
the molar teeth have much elevated and sharp transverse 
ridges, the M. Atlas approximates most nearly to the 
1 The first of Sir T. L. MitchelVs collections was presented by that gentle¬ 
man to the Geological Society ; the other collection, as well as the collection 
formed by the enterprising traveller, Count Strxelccki, arc presented to the 
College of Surgeons. 
