Matekial foe the Study of Ruminants. 



43 



The papillœ circumvallatœ are 12 — 14 in number and somewhat irre- 

 gularly arranged in two (or three) series, thus more numerous than 

 in the foregoing species. 



The t /lu t ulula thijrcoklea has the usual situation just behind the 

 larynx and near the dorsal surface of the trachea. It is formed by 

 an ovate body on each side, measuring about 11 mm. in length and 

 with the narrower end pointing backwards. There is no isthmus be- 

 tween these two bodies. 



The thymus-gland extends from the heart nearly to the larynx. 

 It is a rather thick body 11 — 14 mm. in the thoracic cavity, but ex- 

 tends in front of the first pair of ribs as a 2 — 3 mm. thick cord an 

 each side of the trachea. 



The left lung is divided in three and the right in four lobes 

 and an azygous lobe. The lobulated structure of the lung is very 

 conspicuous. 



Concerning the position of the abdominal viscera may be re- 

 marked that about two thirds of the left lobe of the liver lies on the 

 left side of the median line, but half of the reticulum, the whole paunch 

 and a portion of the abomasus are seen to the left of the same. 

 Behind the paunch the left kidney is visible and behind the abomasus 

 and the left lobe of the liver the coils of the jejunum are seen. On 

 the right side the liver occupies about half of the visible area and 

 behind the same are seen the coils of the small intestine, as well as 

 the caBCum and some parts of the large intestine. In the inguinal 

 tract the ovary and part of the right cornu uteri is conspicuous. 



As in the adult the sulci coronarii are not quite so well deve- 

 loped on the right side, but on the left side there is a well developed 

 sulcus coronarius on the ventri-dextral sack. On the right side it is 

 best visible from the inside. The Saccus cœcus thus determined is of 

 about the same comparative size as in the adult and measures more 

 than a third of the length of the whole ventri-dextral sack. On the 

 dorsi-sinistral sack there is also a short sulcus coronarius on the left 

 side but none on the right. The inside of the paunch is smooth, the 

 papilla? being not yet developed. The reticulum is comparatively larger 

 than in the adult; its diameter being about two thirds that of the 

 paunch. The reticular structure of its inner surface is already well 

 developed. A very remarkable feature is that the psalterium is com- 

 paratively so large viz. measuring 14 mm. in length by 8 mm. in 

 thickness. Its length is thus about two fifths of the length of the 



