416 DR. J. G. G ARSON ON THE [June 1 9, 



The right lung is composed of three lobes— an anterior and a 

 posterior dorsal lobe and an anterior ventral lobe. The anterior 

 dorsal lobe is subdivided into an anterior division and a posterior 

 division. The anterior portion hooks forwards and downwards in 

 front of the heart, more or less completely covering the right auricle. 

 The ventral lobe lies against the posterior wall of the left ventricle, 

 and is deeply grooved for the ascending cava. 



The left lung consists of two lobes — an anterior and a posterior 

 dorsal lobe, the former of which is subdivided into an anterior and 

 a posterior portion. The anterior portion runs directly forwards, 

 while the posterior portion is directed downwards dorso-ventrally. 

 The extreme length of the lungs is about 12 cm., and the extreme 

 depth along the diaphragmatic surface is 9 cm. A portion of the 

 left lung in the form of a small lobule intervenes between the dia- 

 phragm and the heart. 



The heart measures from its base to apex 5-2 cm. ; the antero-pos- 

 terior length from the margin of one ventricle to that of the other is 

 5 cm. ; the transverse diameter is 3'5 cm. 



The spleen is long and narrow, very similar in all respects to that 

 of the Pig, but differs from that of Dicotijles in being more elongated 

 and not so broad at the posterior end. 



The mesenteric glands are numerous and of large size. In some 

 instances several glands are aggregated together so as to form large 

 glandular patches between the folds of the mesentery. The vessels 

 of the mesentery are quite straight, as in the Pig. 



The bi-ain is of small size, measuring, from the olfactory lobes to 

 the posterior part of the cerebellum, 6'2 cm. in length, and 3-8 cm. in 

 breadth. The fissures and convolutions are well marked, and can 



Fig. 1. 



Lateral view, right side ; natural size, after being hardened in spirit. 



readily be compared with those of the common Pig. Adopting the 

 nomenclature proposed by Krueg for the different cerebral fissures ', we 

 recognize the rhinal fissure (Rh) extending along the lower part of the 

 cerebrum on each side throughout its whole length. About the centre 

 of this fissure (figs. 1 and 2), but somewhat nearer the posterior than 

 the anterior end, are the various portions of the Sylvian fissure, the 



1 Zeitschrift f. wissenscli. Zool. Leipzig, 1878, xxxi. pp. 297-344. 



