330 
PROFESSORS T. W. BRIDGE AND A. C. HADDON 
processes, showing the absence of an “elastic-spring” mechanism; the 
left clavicle is withdrawn from its socket ; X 2. 
Figs. 97, 98 . — Silondia gangetica. 
Fig. 97. Ventral view of the cavity of the air-bladder. 
Fig. 98. Enlarged view of the right half; X 3. 
ac. p. 
a.c. 
a.g. 
c.c. 
cd.c. 
c. g. 
d. l. 
i.s.\ 
it.c. 
n. s.^, n.s*. 
n. f. 
o. r. 
l)tf 
r.\ 
r. n. 
s. os. 
sp.n}, sp.n 
s. v.p. 
t. p.\ 
t.p^a. 
t.p.^p. 
t.p.^, t.p.^ 
V \ v}, v.^ 
v.p. 
X. — Eeference Letters. 
(The lettering is uniform throughout.) 
I. Vertehral Column. 
Accessory articular processes. 
Aortic canal. 
Aortic groove. 
Complex centrum. 
Cardinal canal. 
Cardinal groove. 
Dorsal lamina. 
First and second interspinous bones. 
Intercalated cartilage. 
Neural spines of the third and fourth vertebrte. 
Nutrient foramina. 
Oblique lateral ridge of the complex centrum. 
Post-temporal facet on the transverse process of the fourth vertebra. 
First rib. 
Radial nodule. 
Superficial ossification of the complex centrum. 
&c. Foramina for the exit of the first and succeeding spinal nerves. 
Sub- vertebral process. 
Transverse process of the fourth vertebra. 
Anterior division of the transverse process of the fourth vertebra. 
Posterior division of the transverse process of the fourth vertebra. 
Transverse processes of the fifth and sixth vertebroe. 
First, fifth, and sixth vertebral centra. 
Ventral process. 
IT.— 7’Ae Skull. 
(d.s. Alisphenoid. 
at. a. External atrial aperture. 
l^-o. Basioccipital. 
