618 MURIDAZ—EPIMYS 
DIMENSIONS IN MILLIMETRES :— 














EPIMYS NORVEGICUS. 
SEXUALLY MATURE SPECIMENS FROM KILMANOCK, WATERFORD, IRELAND, CAUGHT 
AND MEASURED BY G. E. H. BARRETT-HAMILTON. 
2 . al) 3 Peo 
> a cy 4 > ic D 4 
ed ales ol eed heel al) Blapy taleg 
3S a|oa a| 3 3 alos al 3 
Mae 3g |g (28) e2) & a 3 |g2 (Se) e2G 
ALES. q fo 5 aa ag 7] EMALES. a ra 3 3B Be FI 
3 3/48 $| a 3 alee 4 )), 221 
e| EF} &] 6/2 =| El | 6/2 
1. Undated. .| 216 | 178 | 36 | 20 1. Undated. .| 229 | 178 | 40 | 21 ae 
2; OS ARG | 19161) 3814 | es 2. 13th Mar. 1908 | 267 | 184 | 40 | 20 | 453 
3. Amor. eh errr ll Se 40 | 20 8. 10th Aug. 1909 | 216 | 178 | 38 | 21 se 
4, = 222 | 165 | .. 20 4. 18th Oct. 1910 | 267 | 203 | 40 | 20 
5. $ 241 | 203 | 42 | 28 Bio Gewese lene || 2227 eS )a | meBB aa rg 
6. Assy on |(b229) | zeae |e a ON ae Ga ey 11/285) e780 | eS bon ee) 
7. 18th Mar. 1908! | 254 | 292 | 48 | 20 | 453 ll 7% 4, 4, 4, | 241 | 208 | 39 | 19 
8. 10th Aug. 1909 | 229 | 197 | 40 | 21 Pe 
CE Ser morene mea ICD Y:) | [baer 40 | 21 
U0 ese Ae ay PEO) sll 2. |) an 
11. 18th Oct. 1910 | 273 | .. 41 | 20 
12) We OS) Gy | 2540 7s 40) | 20 
TO pe a ee Wea ee 
Tae sy) age (2229) 2G 4001) 20) 
LG sears eiaste figs |e 250i | (eres 40 | 20 
16 es ay) ss: || 285y 20S 44a] 90) 
TS AR eee eerie ny yf cal 20 es 
18. 8th Mar. 1911. | 267 | 229 | 45 | 20 | 502 
19. 20th Sept. ,, Fay |e 41 | 19 | 516 




1 Males Nos. 7 and 19 were black specimens (‘‘ htbernicus "). 
Weight :—Of twenty “ordinary ” and apparently adult rats weighed 
at Kilmanock on 13th October 1910, fifteen males averaged 13-6 
ounces, or 385 grammes, and five females averaged 14-5 ounces, or 
411 grammes. Higher weights are given in the table above, but 
specimens weighing more than 17 ounces, or 481 grammes, are 
exceptional. Two examined by the editor of the /7ze/d reached 20-5 
ounces, or 581 grammes (a male), and 23 ounces, or 651 grammes, 
respectively (/7e/d, 30th July 1887, 199, and 5th January 1889, 27). 
Neglecting anonymous records, there are at least six other records 
in the Fze/d of weights of over 20 ounces; of these the two heaviest 
are here given for what they are worth:—A male, 29 ounces, or 821 
grammes, killed 1st January 1900 (R. B. Whitford, /ze/d, 20th January 
1900, 95); one, 31-5 ounces, or 892 grammes, killed in 1883 (F. W. 
Cock, Field, 21st January 1888, 91); but it would be safer to take 
the 23-ounce specimen examined by the editor as holding the record.? 
Skull :—Condylo-basal length, 43-4 to 54:2; zygomatic breadth, 
20:2 to 28-6; interorbital constriction, 6-2 to 7-6; occipital breadth, 
16:2 to 21-2; median occipital depth, 10-4 to 13-4; length of a nasal, 
1 It is worthy of note that this specimen was sent in as weighing 28 ounces ; it 
must be remembered, however, as Mr Cocks points out, that animals when dead very 
soon begin to lose weight. 
