102 Mr. Bnooxks on a new Genus of the Order Rodentia. 
quadrupeds which use their paws for the purpose of hands de- 
pending in a great measure for the extent to which they can be 
so employed, on the perfection or deficiency of these bones, and 
on the rotatory motion of the radius on the ulna. | 
.. With the generic character, and with a few observations on 
the single species on which it is founded, I shall now conclude 
this paper. | 
LAGOSTOMUS. 
Dentes incisores in utráque maxillà duo elongati, prominentes ; 
maxille inferioris canaliculati, pauld longiores. 
molares in utráque maxillà utrinque quatuor, obliqui, 
antrorsüm extrorsümque spectantes, corona simplici lami- 
natá; maxille inferioris obliquiores bilaminati; maxille 
superioris tres anteriores bilaminati, posticus trilaminatus. 
Pedes antici breviores, digitis quatuor. 
—-— postici elongati, validi, digitis tribus: ossa metatarsi digitis 
numero zequalia. 
Cauda mediocris, pilis longioribus pectinatis vestita. 
Species unica. ; 
. LAGOSTOMUS TRICHODACTYLUS. 
| Tas. IX. 
Dipus maximus. De Blainville. F. Cuvier, Dict. des Scien. 
Nat. xviii. p. 471. 
To the original descriptions given from the living animal by 
M. de Blainville and by M. F. Cuvier it is necessary for me to 
add but little, their general correctness being shown by a.refe-- 
rence to the stuffed skin. I have ventured to change the trivial 
name, as we are at present unacquainted with any congener with 
which a comparison could be made, and it would be improper 
to retain the epithet mazimus for a single species. That which I 
have 
