124 
September 27, 1842. 
William Yarrell, Esq., Vice-President, in the Chair. 
A letter from the Society’s Corresponding Member, Dr. Cantor, 
was read ; it is dated Calcutta, February 12, 1842, and refers to a 
series of shells collected by that gentleman in Chusan, and which he 
presents to the Society. The following list of these shells, prepared 
by Dr. Cantor, was laid before the Meeting :— 
Helix ravida; Clausilia pluviatilis ; C. aculeus ; Achatina erecta ; 
Planorbis papyraceus; P. hemispherula; P. compressus, Hutton ; 
Lymnea plicatula ; Paludina longicornis ; P. striatula; P. quadrata ; 
P. lecythoides ; Melania cancellata; Arca galactodes; Modiola Sen- 
housia ; Anodon gibbum ; Corbicula fuscata ; Venus Sinensis ; Sangui- 
nolaria iridescens. . 
Mr. Fraser, 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. Fraser. 
Mr. Waterhouse first drew attention to a very interesting new 
genus of Rodents, which he characterized under the name 
ANOMALURUS*. 
Molares = radicati. Cranium sine processu post-orbitali ossis 
temporalis, sed foramine antorbitali magno, partem musculi masse- 
teris transmittente. Palatum anticé coarctatum, posticé emargina- 
tum in forma triangulari. Cauda modicé elongata et subfloccosa, 
parte basali triente subtus scutis magnis in serie duplici longitudina- 
litér dispositis (singulis angulo prominente) obtecta. Awres magne, 
subnude. Patagium inter artus extensum. Rhinarium nudum. Pedes 
subtis nudi; unguibus falcularibus, valdé compressis ; pedes antici 
4-dactyli, digitis subequalibus ; postici 5-dactyli, digitis subzequali- 
bus, interno excepto, hoc breviore. 
Anomaturus Fraseri. An. vellere longo, permolli ; corpore super 
nigro ; dorso flavescenti-fusco lavato ; fronte incanescente ; corpore 
infra albo, vel albido ; artubus intus, patagio ad marginem et gut- 
ture fuliginoso tinctis. 
* From dvogos, out of law, and oved, a tail. Should this have been pre- 
viously used in a generic sense in Natural History, the name Arozthrus 
(from aégéa, to plough, and wi#ga, air) may be substituted. 
