ZEUGLODON OSIRIS. 
239 
The (liiuensions (in centimetres) oE tlio teeth (or their alveoli) are : — 
i. 1 (alveolus only) . . . 
Length. 
... 2-2 
Width. 
Height, 
i. 2 „ ... 
. . . 2-.5 
i-d 
, . 
3 ,, ... 
. . . 2o 
1-5 
c. 1 „ ... 
... 2-9 
1-5 
2mi. 1 „ ... 
... 2-9 
1-4 
. . 
pm. 2 
. . . 3-8 
1-9 
30 
pm. 3 (alveoli onlv) 
... 5 
pm. 4 
... 5-2 
2-5 
5 
... 3 
2-5 
... 2-8 
2-5 
3-9 
... 3-2 
2-5 
3*5 
Some of the above measurements of the teeth are probably somewhat in excess of the 
truth, owing to the presence of a coating of gypsum. 
M. 9264. Plaster cast of the above specimen. Made in the British Museum. 
The following specimens are referred provisionally to this species : — 
C. 10055. Five caudal >vertebrye. In these the epiphyses are fused to the centrum, which measures 
in length 7‘5 cm., in width 7'7 cm., in height 7 cm. The neural arch, enclosing a very 
small neural canal, is situated on the anterior half of the centrum. There are broad 
transverse processes, the bases of which ai’c perforated by a foramen. There seem to 
have been no vascular foramina on the ventral face of the centrum, which bears at its 
hinder end a pair of facets for the chevrons. 
C. 10051. Six associated vertebrae, similar in general form to the last, but belonging to a much smaller 
animal, the length of the centrum in the largest of these specimens being only 
about 5 cm. 
C. 10209. Four posterior lumbar and anterior caudal vertebrae, closely similar to the specimens figured 
by Dames {loc. cit. 1894, pis. xxxv., xxxvi.) and referred by him to Z. osiris. The ends of 
the centrum are slightly concave, the epiphyses being fused. The neural arch has a 
pedicle extending over three-fourths of the length of the centrum. The transverse 
processes are large and directed downwards and backwards ; in the caudal the base of 
the process is perforated. In the lumbars the ventral face of the centrum is concave 
or only very slightly convex from side to side ; in the middle are two large vascular 
foramina separated by a narrow bar of bone ; there is also a foramen (or a pair) in the 
floor of the neural canal. In the caudal vertebra there seem to have been large facets 
for the chevrons. These specimens are from the Birket-el-Qurun beds. The dimensions 
(in centimetres) of the centra of these vertebr® are : — 
Lumbar. Caudal. 
a. b. 0. 
Length 6‘7 6'8 app. 6-7 
Width 8'5 8'2 8 
lleight 7'5 7 ’4 Tapp. 
