tic arch.
[s.cl., sub-clavian.]
t.a., truncus arteriosus.

Veins of the Caval System -(black)-.
b.v., brachial (from fore limb).
e.j., external jugular.
h.v., hepatic vein.
i.j., internal jugular.
[in.v., innominate vein.]
l.v.c.s., left vena cava superior.
p.v., cutaneous vein.
[s.cl.v., sub-clavian vein]
s.s.r., sub-scapular vein.
v.c.i., vena cava inferior.

Veins of the Portal and Renal Portal Systems -(shaded)-.
a.ad., and a.ab.v., anterior abdominal vein.
b.v., and p.v., united are called the sub-clavian vein.
l.fm., left femoral.
l.p., left pelvic.
l.r.p., (and r.p.) left renal portal.
l.sc., left sciatic.
p.v., portal vein.

-(The anterior abdominal is coloured black in Figure 1.)-

The cutaneous artery in the above figures is turned back. In dissection
it will be found to lie over and hide the dorsal-ward sweep of the aortic
arch.

{Illustration: Diagram Sheet 11.}

Sheet 12.

Figure 1. Upper view of the Frog's brain.

Figure 2. Under view of the same.

Figure 3. The same-- median section.

Figure 4. The distribution of the Frog's nerves. Compare Sheet 9,
Figure III.

The shaded part in 4 is the -otic capsule- [tympanum]. The hyoid
apparatus is roughly represented in black to show its relation to IX.
(dorsal to it) and sp. 1 (ventral). Compare {nerves} IX and XII in Sheet
9. The nerves are numbered.

cb., the cerebellum.
c.h., cerebral hemispheres.
f.t., filum terminale.
g.tr., ganglion on the fifth nerve.
l.t., lamina terminalis.
mb., mid-brain.
md., medulla oblongata.
o.l., optic lobes.
pin., pineal gland.
pit., pituitary body.
r.h., olfactory lobes (rhinencephalon).
th.c., thalamencephalon.
sp.1, first spinal nerve.
sp.2, 3, brachial plexus to fore limb.

Figure 5. The spinal column (and pelvic girdle) of the Frog.

Figure 5b. Vertebrae.

Figure 6. The pectoral girdle and limb, dorsal view.

Figure 7. The pelvic girdle and right limb from the side.

(l.h. shows the position of the right lymph hearts-- they are
paired.)

as., astragalus.
b., body.
c., calcar (?= a sixth digit).
cal., calcaneum.
cl., clavicle overlying a procoracoid cartilage.
co., coracoid.
f., fibula.
[FE., femur.]
h., humerus.
il., ilium.
is., ischium.
o.st., omosternum.
pu., pubis.
r., radius.
sc., scapula.
s.sc., supra-scapula.
s.v., sacral vertebra.
t., tibia.
t.p., transverse process.
ul., ulna.
ur., urostyle.
x., xiphisternum.
z., zygapophysis.

1, 2, and etc., first,