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, Miilleriau duct. 

 d.M', ligameut of duct. 

 dpk, mammalian diaphragm. 

 /'. }V, foramen of Winslow. 

 /. W, false foramen of Winslow. 



ff, genital gland. 

 h, h', right and left lobes of liver. 

 Lob, obliqice liganicnt of liver. 

 m, median thoracic septum and abdominal mesentery and 



ligaments that support the alimentary canal. 

 ml, muscle in avian diaphragm. 



0, o', right and left aperture in post-hepatio septum, 

 oes, oesophagus. 



ov, ovary, 

 pa, pancreas. 

 ■pc, pericardium. 

 pro, proventriculus. 

 ■pul, lung. 

 re, kidney. 

 s.a, s.a', s.a'', s.a"', interclavicular, anterior diaphragmatic, posterior diaphrag- 

 matic, and abdominal air-sacs of bird. 

 s.ob, oblique septum. 

 spl, spleen. 

 spl', fatty " spleen " (?). 



t, testis. 

 v.a, left allantoic, or anterior abdominal vein. 

 v.c.s, vena cava superior. 

 v.c.i, vena cava inferior. 

 v.om, v.om' , right and left omphalo-mesenteric vein. 



v.w, line of attachment of /3 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. 

 (3, ventral or "omental" ])oHion o( post-hepatic septum (ventral 



ligament of stomach and posterior part of liver), 

 y, oblique abdominal septum (antero-dorsal portion of post- 

 hepatic septum). 

 *, 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- 

 made sections. 



Figs. 1, 2. Two transverse sections of chick-embryo of Gth day in the region of 

 the lungs and heart. 



Fig. 3. Transverse section of embryo of Lacer^a through same region. 



Fig. 4. Transverse section of embryo mammal. 



Figs. 5, 6, 7. Three transverso-borizontal 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. Zool. Soc— 1889, No. XXXII. 32 



