52 Zoological Society. 



trees, plants, and occasionally views drawn from nature, appear on 

 each plate. 



The work contains figures and descriptions of all the viviparous 

 quadrupeds found in the United States, and from Texas, California, 

 and the North-west Coast, to the British possessions and arctic re- 

 gions of North America. 



The work will be delivered to subscribers in numbers of five plates 

 each, at intervals of tM'^o months from the publication of each num- 

 ber, making six numbers annually, and the whole work will be com- 

 pleted in about thirty numbers. 



PROCEEDINGS OF LEARNED SOCIETIES. 



ZOOLOGICAL SOCIETY. 

 Sept. 27, 1842.— William Yarrell, Esq., Vice-President, in the Chair. 



Mr. Eraser, the naturalist to the Niger expedition, exhibited seve- 

 ral new species of Quadrupeds, constituting part of his collection 

 formed at Fernando Po ; and Mr. Waterhouse, at the request of the 

 Chairman, read his description of the new species, these having been 

 placed in his hands for examination by Mr. Eraser. 



Mr. Waterhouse first drew attention to a very interesting new 

 genus of Rodents, which he characterized under the name 



Anomalurus*. 

 4 — 4 

 Molares -rzi^ radicati. Cranium sine processu post-orbitali ossis 



temporalis, sed foramine antorbitali magno, partem musculi masse- 

 teris transmittente. Palatum antic^ coarctatum, postice emargina- 

 tum in forma triangulari. Cauda modice elongata et subfloccosa, 

 parte basali triente subtus scutis magnis in serie duplici longitudina- 

 liter dispositis (singulis angulo prominente) obtecta. Aures magnae-, 

 subnudaj. Patagium inter artus extensum. Rhinarium nudum. Pedes 

 subtus nudi ; unguibus falcularibus, valde compressis ; pedes antici 

 4-dactyli, digitis subsequalibus ; postici 5-dactyli, digitis subsequali- 

 bus, intemo excepto, hoc breviore. 



Anomalurus Fraseri. An. vellere longo, permolli; corpora super 

 nigro ; dorso flavescenti-fusco lavato -, f rente incanescente ; corpore 

 infra alho, vet albido ; artubus intus, patagio ad marginem et gut' 

 iure fuliginoso tin ctis . 



unc. Vm. 

 Longitudo ab apice rostri ad caudse basin. ... 14 



Cauda 8 G 



auris 1 3 



tarsi digitorumque 2 6 



Hab. Fernando Po. 



Upon a cursory inspection this animal would be regarded as a 



* From difofiog, out of law, and ov^oi, a tail.- Should this have been pre- 

 viously used in a generic sense in Natural History, the name Arocethrus 

 (from d^oa, to plough, and uU(iot, air) may be substituted. 



