43 
Diam. max. 3/’; alt. 1/"". 
Hee species P/. deflectum Sayi in mentem vocat. 
Hab. in Asia minore (H. Spratt). 
Jf 16. Puanorsis Pururprianus, Dkr. PI. testd discoided, subnitidd, 
tenuissime obsoleteque striatd, pallide corned, diaphand, supra 
planatd, medio impressd, infra pariim concavd ; anfractibus senis 
rotundatis sensim crescentibus ; aperturd subrotundd, subobliqud. 
Diam. max. 53!"; alt. 11!" 
Patria Cochabamba in Bolivia. 
2.’ Somr oBsERVATIONS ON Myoprs Hupsonicus AND THE OTHER 
SPECIES OF THE GENUS Myopzs. By J.E. Gray, Esa., F.R.S. 
ETC, 
The Governor of the Hudson’s Bay Company having kindly sent to 
the British Museum the extensive series of Mammalia, Birds and 
Fish collected by Dr. J. Rae in his late very interesting journey, I 
have been induced to lay before the Society some remarks on the 
species of the genus Myodes, which I hope will tend to elucidate the 
history of these interesting animals. 
Myodes Hudsonicus has been distinguished as a species by the large 
size and peculiar form of the claws on the front feet; but the speci- 
men contained in this collection appears to prove that these large 
claws are only found in some individuals, or more likely in only one 
sex, and that the other individuals or sex have small, curved, sharp 
claws, like the typical species of the genus; and this also appears 
to be the case with Myodes helvolus, Richardson, for one specimen in 
the collection has the small typical claws which Sir John Richardson 
assigns to the species, and the other has very large, thick, rounded, 
bluntly truncated claws on the fore-feet, which is probably the cha- 
racter of the males. 
The species of the genus in the British Museum may be thus di- 
vided :— 
I. The upper cutting teeth narrow, smooth, without any longitu- 
dinal grooves. Thumb with a compressed, curved, acute claw. 
a. Claws of fore-feet simple, curved. we 
M. Lem¥xus, two specimens ; Sweden. 
M. helvolus, Richardson, one specimen. 
6. Claws of fore-feet of some (males?) specimens compressed 
above, with a round, dilated, expanded pad beneath. 
M. Grenlandicus. Fur with a dorsal streak. 
c. Claws of fore-feet of some (males?) specimens very large, 
compressed, strap-shaped, and with a deep triangular notch 
at the end. 
M. Hudsonicus. 
II. The upper cutting teeth broader, with a central longitudinal 
groove ; claws of the thumb strap-shaped, truncated, and notched at 
the tip. 
M. helvolus, Rich. Claws of some specimens (males?) thick, 
subcylindrical, curved, truncate. 
