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 two months from the publication of each num- 

 ber, making six nurubers 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 Quadrujieds, 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. Fraser. 



Mr. Waterhouse first drew attention to a very interesting new 

 genus of Rodents, which he characterized under the uame 



Anomalurxjs*. 

 4 — 4 . . 



Molares tzTa' radicati. Cranium sine processu post-orbitali ossis 



temporalis, sed foramine antorbitali magno, partem musculi masse- 

 teris transmittente. Palatum antice coarctatura, postice emargina- 

 tum in forma triangulari. Cauda modice elongata et subfloccosa, 

 parte basali tricnte subtiis scutis magnis in serie duplici longitudina- 

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

 subnudec. Pa^opriMjH inter artus extensum. Rhinarium xindinm. Pedes 

 subtus nudi ; unguibus falcularibus, valde compressis ; pedes antici 

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

 bus, interno excepto, hoc breviore. 



Anomalurxjs Fraseri. An. vellere loncjo, permoUi ; corpore super 

 nigro ; dorso flavescenti-fusco lavato ; fronte incanescente ; corpore 

 infra alba, vel albido ; artubus intus, j^atacjio ad marrjinem et gut- 

 ture fuliginoso tinctis. 



unc. lin, 

 Longitudo ab apice rostri ad cauda; basin. ... 14 



caudce 8 G 



auris 1 3 



tai'si digitorumque 2 6 



Hah. Fernando Po. 



Upon a cursory inspection this animal would be regarded as a 



* From oii/of4,os, out of law, and ov^», a tail. Should this have been pre- 

 VJou;-ly used in a generic sense in Natural History, the name Arorethrus 

 (from dfjoo, to plongb, and u'l'd^x, air) may be substituted. 



