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REPORT ON ZOOLOGY, MDCCCXLIl : 
The specimen here, which also came from Chili, is of the same colour. 
In a third specimen, said to be from Paraguay, the apex of the nose, 
with the whole fur, is rusty red ; the border of the mouth ash grey.* 
Weber showed, in the meeting of Natural Historians at Brunswick 
(Verb. p. 65), that in the male Beaver, behind the urinary bladder, there 
lies another bladder, which much resembles a utmts hicornis, and con- 
sists of two tubes. 
Aculeatea. — Atlierura africana (A, fascieulata, Benn.) 
was characterized by Gray as follows, from a living and a 
stuffed specimen (Ann. x. p. 261) : — 
Spines all dull steel black; of the back strong, elongate, end com- 
pressed, angular ; of the head, under parts and limbs flat, channelled ; 
whiskers black, bristly ; tail elongate, tapering, |d the length of the 
body, with a tuft of compressed white elongate quills; ears rounded, 
somewhat naked, black ; Sierra Leone. Very different from the figure 
of the Indian Atherura in the Illustrations of Indian Zoology. 
The Cercolabes melanurus, characterized by me in these Archives, 
1842, 1 Bd. p, 360, has, at the same time, been defined by Gray in the 
Ann. X. p. 262, under the name Sphiggurus melanurus, 
SuBUNGULATA — Dasyprocta nigricans, Natt., has been 
distinguished from the other species by the reporter, in the 
Archives, v. J. 1 Bd. p. 362. 
Among the three new species of Dasyprocta which Gray has described 
in the Ann. x. p. 264, his D. nigra is identical with our D. nigricans, 
Natt. From a young immature specimen, Wagler had previously marked 
it as D. fnliginosa, Gray’s D. punctata is the real Aguti described by 
Azara, to which, therefore, Lichtenstein has given the name of D. Azaroe. 
This species belongs to Paraguay and the southern regions of Brazil, 
but is totally absent in the northern, according to Natterer’s exact inves- 
tigations. The D. aguti, described by Desmarest, Fr. Cuvier, the Prinz 
von Wied, and others, is peculiar to the north and east parts of Brazil. 
Natterer collected most of his specimens at Borba, where the D. Azarce 
* In the specimens in the collection here, the reverse is the case. The South 
Brazilian have the fore-part of the snout and the margin of the mouth of rather 
a rich white, while in the Chili specimens above mentioned, the same parts are 
muddy grey. In one of the South Brazilian, the fore-paws are grey ; in another 
the whole fur is yellowish-white. The Chili specimen is, on the whole, darker 
coloured than the South Brazilian, because the black of the scattered hairs 
more extended. The same is observable in the whiskers, vdiich, in the South 
Brazilian, are mostly white ; in the Chili ones, black, mixed with some brown. 
—Editor of Arch. 
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