78 "Miscellaneous. 
in front; of the inner series only two or three could be counted, 
others had probably been present. The outer row in the lower jaw 
consisted of about sixteén teeth on each side, without counting the 
long ones in front. 
The following are the dimensions of the specimen :— 
inche 
Total len Bi ety se 5 Sie CO eo oe eee He HH HEE DO 34/5 
Height over middle of anal, rather more than a 
Head, lengthy « aconiyisguer ae ace geet ach RS «0 nec] ee 
{MENS OGL seca ceive de had <pysye Padaaale aeedte 74 
Wye, GISBICLEE Friis fae aievsxta ay tr cr + 
Maxillary. .. vf oases afi fin. sous canedinan ott ene aang 
Teeth, length of fourth pair under jaw .......... 3% 
First dorsal, height and length of base .......... 10 
, MESCANCEMTOUY MIUZZIE: cs enc ceases ces fen 
Second dorsal, distance from muzzle . . = 1,45 
“ , distance from first dorsal.......... zo 
ed x length Of base sins. onic nse geney | ee 
yp RCHE ING 2 Bia teyeiairate tacais nr ek ae baad OM <0 
Pectorais, len gia esa ity tie an Fwimw a wetenny wee ae i 
S WOTCLGHOL DASE srcrehhcouie ais mine ROLE © ney ty 
S MIStAMee: [TOM MUZZIC.< cas we ssid acres 
Nehtrals, length 4.20 0 ae esices sen 4 4a ee. eee 
Anal, distance from muzzle..........e0ence sss bey 
PLCHOLD OL DESGi ey hes (ex ace cenasssics 4 ER AEE ify 
geleht In frome: cops c 4 ni as «04 sis aged aera IO 
Caudal, lengli ison Ga geet. nai oak wera ear ih 
Bur-biadderv lengths, a wy. cyte eee vigie scam on 4 
MISCELLANEOUS. 
Migration of Lemmings. 
To the Editors of the Annals of Natural History. 
GENTLEMEN,—In a recent Number of the ‘Annals and Magazine 
of Natural History,’ the subject of the migration of Lemmings was 
discussed, and some causes of it, propounded by M. Guyon, mentioned, 
none of them being quite satisfactory. 
I have discovered that rats in England frequently abandon good 
quarters, where they have plenty of food and are unmolested by man 
or carnivora, and that the cause of their doing so is that they are 
plagued with insect vermin—fleas, lice, and ticks. 
Knowing that insects are a plague to man in Lapland, I beg to 
suggest the question whether the occasional migrations of Lemmings 
may not be caused by the unusual abundance of insect vermin of the 
above-mentioned or other kinds. 
Perhaps I may mention here something I have observed about 
Dormice. In some parts of Suffolk they are very numerous, and 
are called Sleep-meece by the labourers. In other parts, if turned off 
in woods equally abounding in oaks and hazel, they seem not to in- 
