EOSIIJEN’ LIBTCA. 
217 
Iff. 8152. Upper portion of middle region of sknll, showing the nasals and tlieir relations to the 
])reniaxillae and frontals (text-fig. Gl). The anterior ends of the f'rontals are thrust 
between the nasals, and probably completely se{)arated them, hut this cannot he 
definitely ascertained on account of the breaking away of the hone at this [)oint. The 
posterior ])ortion of this specimen also shows the anterior up[)er portion of the l)rain- 
case, of which a natural cast is preserved. The width of the skull-roof between 
tcmj)oral fossae 3’9 cm. ; width of nasal opening .3'2 cm. 
Presented by JV. E. de Winton, Esq., 11)03. 
C. 10040. Mandible incomplete posteriorly. All the teeth wanting and represented only by the 
empty alveoli. Figured in Geol. Mag. [4] vol. ix. (1902) p. 294, fig. 3 ; also on 
PI. XX. tigs. 2, 2 A. This specimen shows the presence of possibly functional incisor 
and canine alveoli in the downwardly turned symphysial region •, this latter is enormously 
thickened ventrally. There is some evidence that the replacement of the molars from 
behind had already begun, at least in the mandible. The dimensions (in centimetres) of 
this specimen so far as preserved are : — 
Total length 20’5 
Depth of ramus beneath posterior molars 4' 6 
Width of symphysis 6'4 
Length of symphysis 6‘3 
M. 8926. Imperfect mandible, wanting the vertical portions of the rami and symphysis. The greatly 
worn posterior molars are present, the other teeth are represented by the alveoli only. 
The length of this specimen is 20 cm., the length of the symphysis 5+ cm. 
C. 10048. Numerous ribs and vertebrte. This specimen shows that in Eosiren the ribs had attained 
the great thickness and generally massive structure characteristic of some of the later 
Sirenians. In the case of one rib the length is about 24 cm., the greatest diameter 
5’4 cm. 
C. 10191. Complete left scapula, showing the peculiar backward curvature and prolongation of the 
upper end. Figured on PI. XX. fig. 3. The dimensions (in centimetres) of this 
specimen are : — 
Extreme length 20 '8 
Width of uj)per prolongation 6-2 
Greatest width of blade 8'5 
Width of neck 4‘2 
„ at coracoid process 5’4 
Autero-posterior diameter of glenoid cavity 4 
Lateral diameter of glenoid cavity 2'5 
Iff. 9232. Plaster cast of the above specimen. Made in the British Museum. 
Iff. 9238. Left humerus, wanting the proximal epiphyses. Described above ; figured on PI. XX. 
fig. 7. The dimensions (in centimetres) of this specimen are : — 
Length (so far as preserved) 13-2 
Width of proximal end 4-7 
„ middle of shaft 1'8 
„ distal end 4'8 
distal articular surface 2-9 
