80 
arise from the difference in the thickness of the shell of their eggs, 
the shell of the Rhea being thinner than that of the Emu. 
Mr. Gould exhibited four new species of Kangaroos from his col- 
lection, and pointed out their chief distinguishing characters. These 
four species Mr. Gould proposed to name Osphranter Antilopinus, 
Osphranter (?) Isabellinus, Halmaturus agilis, and Lagorchestes conspi- 
cillatus. ‘The first of these Kangaroos is of large size, and remarkable 
for the great expanse of the nasal cavity, and consequent dilatation 
of the bones which inclose that cavity. The bony palate is desti- 
tute of the large posterior openings found in the skulls of the ty- 
pical Halmaturi. ‘The incisors are comparatively small; the fore- 
most incisor on each side is rather broader than the second, and the 
posterior incisor is about equal in width to the other two taken to- 
gether. On the outer surface of the first and second incisors may 
be perceived faint traces of longitudinal grooves, and the hindermost 
of these teeth has a distinct vertical fold situated rather in front of 
the middle of the tooth. The adult skull presents false molars 
i true molars, =) and the skull of an aged individual has the 
false molars = true molars, o3 
The muffle is broad and naked; the muzzle is broad and rather 
short; the ears are moderate and rounded at the apex. The fore- 
limbs are comparatively long and stout, and the toes and claws are 
very strong. The hind-limbs are short and muscular; the middle 
toe of the hind-foot is very large, whilst the lateral toes are but little 
developed ; the two small inner toes (which are united in one com- 
mon integument as in other Kangaroos) terminate in a line with the 
small outer toe, or very nearly so. The under surface of the feet is 
very rough, being covered with small horny tubercles. 
These characters, especially the great expansion of the muzzle and 
the comparatively small development of the lateral toes of the hind- 
feet, and inerease in size of the central toe, Mr. Gould is of opinion 
should be regarded as generic, or subgeneric, rather than specific ; 
he therefore proposed for the animal the new sectional title of Os- 
phranter. The specific name Antilopinus was suggested by the pe- 
culiar texture of the fur, which resembles that of an Antelope. The 
principal characters are as follows :— 
OspHRANTER AntiLorinus. Osphr. rhinario lato, nudo ; rostro lato, 
amplificato, cavis nasalibus amplis ; caudd elongatd, validd, pilis 
brevibus adpressis indutd ; tarsis posticis mediocribus, digito in- 
termedio permagno, digitis lateralibus parvulis, et inter se eddem 
longitudine ; vellere brevi, aliquanto rigidd et adpressd (sicut in 
Antilope videtur) ; colore rufo, artubus pallidioribus ; corpore 
subtis, guld, aurium, artuumque partibus internis, nec non caude 
basi infra, albis vel flavescenti-albis. 
Feemina vellere flavescente, apud dorsum fuscescente ; capite superné 
fusco, albido adsperso, occipite, et auribus externe fuliginoso- 
Suscis ; genis, guld, artubus internis corporeque subtis pallide 
flavescentibus ; caude@ basi infra flavescenti-albd, 
