i 
RASS MOUSE 
DIMENSIONS IN MILLIMETRES :— 

Tail (with- | Hind foot Ear * ; 
Hpi and loutterminal] (without | (greatest Mipeho 
x0 hairs). claws). length). sr i 
M. o. ronaldshaiensis, South Ronaldshay— 
1. Male, 23rd Oct. 1907 (type of sub-species) 126 41 19 
2. Female, 31st Oct. 1907 (Royal Scottish 
Museum) . c G 5 a 
3. Female, 31st Oct. 1907 (Royal Scottish 
Museum, W. Eagle Clarke) Q 3 
128 40 19 
127 40 19 


SPECIMENS CAUGHT AND MEASURED BY N. B. KINNEAR, AT STROMNESS, POMONA. 
MALEs :— 
M. o. orcadensis— 
24th May 1905. . 111°5 
th |, 115 
2th ,, ‘ A 100 
26th —s« 113 
26th mn 109 
26th ,, 4 * 109 
26th ,, era 121 
2th =, ; - d 116 
27th =, : 119 
27th ,, : : : 122 
27th sé, 4 0 : 125 
2th ,, 119°5 
28th ,, 112 
gsth ,, 120 
29th =, 0 i 116 
29th =, - 121 
soth  G; 116 
29th ~=sé,,, 118 
30th =, 3 121 
30th ~~, . 5 OR 120 
80th st, 4 120 
22. 80th ,, : 124 

Average of 22 males . s 116°5 

FEMALES :— 

| M. o. orcadensis— 
24th May 1905 5 107 48 
24th, aks 105 ll 46-08 
25th Pn 6 113 H 11 43°52 
2%th eed esl Wan 120 46-27 
26th 3) 3 114 . 48-02 
26th : 100 12 40-06 
26th rr . 5 120°5 51°20 
26th ; 125 12 59°71 
27th a < 105 iH 12 84-11 
27th ” < 102 Hi 11 48°06 
28th ;, ; 123 : 12 63-04 
29th Ss c Cs 109°5 11 42°24 
29th a . . 103 q 11°5 43°26 
30th * 121 13 58 50 
80th 9 116 13 51°84 
30th eh 5 114 H 12 46°08 


Average of 16 females * 112°37 Pp 18°4 118 46°08 



* This series may be taken as consisting only of individuals born before the current season. 
The influence of immature specimens on the average in October, and the general subsequent increase in size ( 
p es Shrews, above, p. 92) is shown in the following table, which is also based on measurements supplied 
Kinnear :— 
9th to 14th Oct. 7th Nov. 17th Nov. Dee. 1905, 
Ives. (12) (16) (8) (9) 
Maximum. 5 5 5 105 (female) 126 (female) 126 (male) 120 (female) 
appoxunate ave! 5 . 93°8 102°6 106°6 109°5 
iiititetie 5) SA RG © 83°5 (female) 92 (female) 94 (female) 100 (female) 


