THE CCELOM 



41 



muscular fibres ' in the oblique septum of the duck ; and in 

 the puffin } (Fratercula arctica) and the penguin (Eudyptes, 

 Eudyptula minor and Spheniscus demersus) the posterior 



FlG. 2(). DIAGRAM OF A TKANSVERSE SECTION THROUGH 



THORAX OF DUCK. 

 L.L,R.L, lobes of liver; L, luugs; A.S, horizontal septum ; O.S, oblique septum. 



FIG. 27. SIMILAR DIAGRAM OF CROW (Cori'iis capellanus). 



, rudiments of sternal attachment of oblique septum. Other letters as in tig. -ii. 



part of the oblique septum is largely covered with a thickish 

 layer of muscular fibres, which FILHOL 2 (their describe) 1 in 



1 BEDDARD, 'Notes on the Visceral Anatomy of Birds,' II. 'On the 

 ratory Organs in certain Diving Birds,' P. Z. S. 1888, p. '2-VJ. 



- ' Sur la Constitution clu Diaphragme des Kinlijiitca.' Hull. Sc. J'lnlani. (7), 

 vi. p. 2a"). 



