1889.] THE BODY-CAVITY IN LIZARDS, ETC. 471 



They can, however, be compared vvitb the latter by reason of the 

 fact that the Birds can themselves be compared with the Lizards. 

 The Lizards would seem, so to speak, to form the nearest approach 

 to a " greatest common measure " for the Birds and Crocodiles at 

 present available, in the absence of much wanted embryological data 

 with regard to the latter. 



5. The family of the TeiidtB is noteworthy from the development, 

 at any rate among some of its members, of a more or less complete 

 post-hepatic septum, and for the absence of the usual attachment 

 between the lung and liver-lobe of the right side. 



VIL List of principal Memoirs and Papers referred to. 



1. Sappey. — Recherches sur I'appareil respiratoire des Oiseaux. 



1847. 



2. Cadiat. — Du developpement de la portion cephalothoracique de 



I'embryon. Journal de 1' Anatomic et de la Physiologic, vol. 

 xiv. 1878, pp. 630-674. 



3. His. — Mittheilungen zur Embryologie der Saiigethiere u. der 



Meuschen." Archiv fiir Anat." u. Phys. 1881, Anat. Abth. 



4. Huxley. — On the Respiratory Organs of Apteri/x [comparing 



with Duck]. P. Z. S. 1882, pp. 560-569. 



5. UsKow.— Ueber die Entwickelung des Zwerchfells des Pericard. 



u. d. Coeloms. Archiv fiir mikr. Anat. 1883, pp. 143-219. 



6. Lockwood. — The early development of the Diapbragm, 



Pericardium, and Great Veins. Phil. Trans. 1888, pp. 365- 

 384. 



7. Lock-wood. — Abstract of Lectures on the development of the 



Organs of Circulation and Respiration, including the Pericar- 

 dium, Diaphragm, and Great Veins. Brit. Med. journal, April 

 7, 1888. 



8. Duval. — Atlas d'Embryologie. Paris, 1888. 



9. Eavn. — Ueber die Bildung der Scheidewand zwischen Brust 



und Bauchhbhle in Saugethierembrvonen. Archiv fiir Anat. 

 u. Phys. 1889, Anat. Abtb. pp. 123-154. 

 10. Straul und Carius — Entwickelungsgeschichte des Herzens 

 u. der Korperhohlen. Archiv fiir. Anat. u. Phvs. 1889, Inat 

 Abth. pp. 231-248. 



Postscript. 



While these pages were passing through the press my attention 

 was, by Prof. Howes, directed to a paper by Ravn (Archiv fiir Anat- 

 omic und Physiologic, Anat. Abth, 1889, p. 412), published after the 

 sending in of my own. 



This is one of a series of papers by that author on the develop- 

 ment of the diaphragm and adjoining organs. In it the various 

 membranes and septa that are visible in the body-cavity of the adult 

 male Lacerta viridis are carefully described with the aid of fio-ures. 

 He calls attention to certain membranous tissue posterior to the 

 heart which he would regard as representing part of the more 



