
MURIDA—ARVICOLA 
DIMENSIONS IN MILLIMETRES—continued :— 


| 
Tail (with- 















Hind foot Ear Weight 
Head and |out terminal] (without | (greatest in 
y hairs). claws). length). grammes. 
SEXUALLY MaTuRE FEMALES :— 
Arvicola amphibius amphibius— 
175 120 34 16 oi 
4 < 175 2 16 
is Hives Reigate, Surrey (L. E. Adams), es Hea on 17 226 
. ; ¥ G c e 185 125 33°5 Dt s 
205 144 85 16 255 
2 ‘Three, Shalford, Surrey(W.R. Ogilvie. {| 35 Pe = “id 
Grant), Sept. 1906 . pes ngs st Mi oe 
yPeP : 201 117 38 17 4 
8. Two, New Forest, Hants (G. s. Miller), ‘ 
2nd July 1893 . . 195 105 37 16 a. 
Do. do. Ist July 1894 . 204 125 36°74 16 ae 
4. Two, Exeter, Devon (HE. Hollis) . { a8 us 2 a Ps 
5. Cheadle, Staffordshire . 185 118 33 ot oe 
6. Great Kimble, Bucks (E. Hollis) A 185 119 33 18 BD 
7. Wendon Lofts, Essex (A. Wright), 18th 
Dec. 1894 . 170 92 30 Sc oe 
8. Cambridge (Tom Orpen), 26th May 1894 189 118 30 a 241 
9. Two, West Runton, Norfolk(A. Rud- 174 104 34 18 oe 
dle), Sept. 1912. 186 122 85 16 : 
10. Two, Great Grimsby, “Lines (G. H. 
Caton Haigh), 15th Nov. 1895 . 174 114 28 we 
Do. do. 24th July 1895 . . 220 113 30 - 
11. Two, Read’s Island, River Humber 
(Captain Hume), 28th March 1896 3 190 123 32 14 35 
Do. do. 29th March 1896 194 127 32 12 
Average . 187'1 116°5 82-7 16 
MALEs :— 
Arvicolu amphibius reta— 
1. Glenfesshie Forest, Inverness-shire (G. 
A. Cooper), 29th April 1905. 190 125 32 16 
2. Lanbryde, Morayshire (W. Taylor), 30th 
Jan. 1911 5 163 102 32 16 
3. Collieston, Ellon, Aberdeenshire (Hon. 
J. E. Edwardes), 28th Aug. 1912. 5 172 88 33 a) 
4. Cortachy, Forfarshire (E. A. pyaeoa): 
27th July 1908. 168 96 382 17 
5. Two, Windygates, Fife (N. B. Kinnear), { 174 113 31 15 
ond July 1905 e 160 108 32 15°5 
6. Two, Blackwood, Kirkmuirhill, Lanark- 
shire (N. B. Kinnear), 25th March 1904 169 100°5 81 - 
Do. do. 22nd April 1904 183 107 31 OS 
FEMALES :— 
Arvicola amphibius reta— 
1. Cortachy, Forfarshire Ge A. Wilson), 
27th July 1908 . 162 97 $2 17 
2. Windygates, Fife (N. B. Kinnear), 2nd 
July 1905 A 194°5 109 80°5 14°5 
Do. do. 8th August 1904 182 114 31 18 
Do. do. 26th Oct. 1906 . 160 102 380 14 
Do. do. 26th Oct. 1906 . 157 95 29 14 
Do. do. 24th Oct. 1906 . ‘ 155 95 28 15 
3. Kirkmuirhill, Lanarkshire (N. B. Kin- 
near), 5th Oct. 1904 . : 163 pe 88 14 
Do. do. 9th Oct. 1904 . A 152 96 81 13 
Do. do. 9th Oct. 1904 . 142 92 82 13 
Do. do. 10th Oct. 1904 . 154 91 381 14 

1 With 5 large embryos. 


2 The skull shows that this specimen is an aged individual; the condylo-basal length is 41-9 mm., the 
ridges are strongly developed and fused in the inter-orbital region. 
3 All these specimens are probably immature, and some of them are brown in colour. 
