1889.] THE BODY-CAVITY IN LIZARDS, ETC. 473 
cor, coracoid. 
c.W, Wolfian body. 
d.a, avian diaphragm. 
d.a°, representative of avian diaphragm. 
d.C, duct of Cuvier. 
d.M, Miullerian duct. 
d.M’, ligament of duct. 
dph, mammalian diaphragm. 
t.W, foramen of Winslow. 
f.W’, false foramen of Winslow. 
g, genital gland. 
h, h', vight and left lobes of liver. 
l.0b, oblique ligament of liver. 
m, median thoracic septum and abdominal mesentery and 
ligaments that support the alimentary canal. 
ml, muscle in avian diaphragm. 
o, o’, right and left aperture in post-hepatic septum. 
oes, esophagus. 
ov, ovary. 
pa, pancreas, 
pe, pericardium, 
pro, proventriculus. 
pul, lung. 
re, kidney. 
s.a, 8.v, 8.0’, s.a/’, interclayicular, anterior diaphragmatic, posterior diaphrag- 
matic, and abdominal air-saes of bird. 
s.ob, oblique septum. 
spl, spleen. 
spl’, fatty “ spleen ” (?). 
z, testis. 
v.a, left allantoic, or anterior abdominal vein. 
v.¢.8, Vena cava superior. 
v.c.1, vena cava inferior. 
v.0m, v.om', right and left omphalo-mesenteric vein. 
v.w, line of attachment of 6 to ventral body-wall. 
z, seeker passed through false foramen of Winslow. 
1, 1’, right and left ventral liver-sacs. 
2, 2’, right and left pulmohepatic recesses. 
3, peritoneal cavity. 
4, pleural cavity. 
4°, pulmo-hepatic portion of body-cavity. 
a, pulmohepatic ligament. 
B, ventral or “omental” portion of post-hepatic septwm (ventral 
ligament of stomach and posterior part of liver), 
y, oblique abdominal septwm (antero-dorsal portion of post- 
hepatic septum). 
x, T, see text. 
Figs. 1-28 are selected from complete series of sections cut with a rocking- 
microtome. Figs. 36-41 and 43-47 are drawings of thicker hand- 
mace sections, 
Figs. 1, 2. Two transverse sections of chick-embryo of 6th day in the region of 
the lungs and heart. 
Fig. 3. Transverse section of embryo of Lacerfa through same region. 
Fig. 4. Transverse section of embryo mammal. 
Figs. 5,6, 7. Three transverso-horizontal sections of the chick of the 7th day 
drawn (enlarged) in fig. 25, Fig. 5 is nearest the shoulder ; fig. 7 
nearest the head and tail (all x 20). 
Proc. Zoou. Soc.—1889, No. XXXII. Be, 
