688 Proceedings of the Hoyal Society of Edinburgh. [Sess. 
Measurements of Skulls. 
Royal Scottish 
Museum, 1872, 
P. 
Shetland, 
1881, 
Shetland, 
1885, 8- 
Dalgety, Firth 
of Forth, 
1888, 8- 
Morrison’s 
Haven, 1895, g . 
St Andrews, 
1908, 
Greatest length of skull in 
straight ]ine 
75 cm. 
broken 
76 
77-3 
broken 
82-8 
Length of rostrum . 
49 
broken 
5L2 
51 
51 
59 
Height from vertex to ptery- 
goids ..... 
24 
26 
27 
27 
broken 
25-4 
Breadth between upper mid- 
orbital borders 
28-5 
28-5 
28-4 
29 
290 
Breadth across occipital condyls 
11 
10 
1M 
10-3 
10*5 
11*2 
Breadth between ant-orbital 
notches .... 
20 
18*5 
17-3 
17-5 
20-5 
19-8 
Premaxillae, width behind 
anterior nares 
13 
11-5 
11-8 
12-3 
12-5 
12*3 
Premax illae, width in front of 
anterior nares 
10 
10 
11 
9-2 
10-5 
9-9 
Premaxillae, width opposite 
anterior nares 
11 
10 
10*4 
10 
10*6 
11 
Width of anterior nares . 
4-5 
5-5 
5-6 
5*4 
4-8 
6-2 
Mandible, length of . 
69 
65 
67 
65'5 
broken 
73-8 
„ „ symphysis 
24 
broken 
23-3 
21 
22-8 
27-6 
,, height of ramus 
11 
10 
10-7 
11 
broken 
11-2 
Skull . — The skull of the St Andrews specimen had the characteristic 
elongated, slender beak, and other general characters of the species. It 
was 82 - 8 cm. (32J inches) in maximum length, and was the longest skull in 
the Table of measurements. The rostrum was not broken, and the slender 
tips of the superior and premaxillary bones as well as the mesial cartilage 
of the beak reached its free end. The length of the beak was 59 cm. 
(23f inches). The mes-ethmoid septum was prolonged into the upper end 
of the medio-rostral gutter for 8 cm., and was embraced anteriorly by the 
medio- (meso-) rostral bone, which occupied the gutter for 21 cm. This 
bone was divided on its upper surface into two lateral halves by a 
longitudinal groove, and in front of it the unossified medio-rostral cartilage 
extended to the tip of the beak. 
In the 1881 specimen from Shetland, the mes-ethmoid was embraced 
by the medio-rostral bone, which was divided by a longitudinal groove 
into two distinct lateral halves as far as 24 mm. from the anterior pointed 
end, near which the surface of the bone was tuberculated. In the skull 
from Morrison’s Haven the halves were fused together for 154 mm. 
from the pointed end, and the surface of the bone was smooth. The free 
end of the rostrum of this skull was somewhat curved to the right, and a 
