APPENDIX. 205 



we compare the relation of the reticulum to the rumen 

 in that tribe with the corresponding free communication 

 which subsists between the water-bag and rumen in the 

 camel tribe ; and when also we observe in both the 

 precise correspondence in the mode of communication 

 of these two cavities with the oesophagus, and with the 

 muscular apparatus destined to convey the remasticated 

 food beyond their apertures into the third cavity, and 

 at the same time find an approach to the peculiar dis- 

 position of the cells of the water-bag in the reticulum 

 of some of the horned ruminants, it becomes evident 

 that the two cavities are analogous, the reticulum of the 

 camels being modified for its destined function by the 

 greater development of the secondary cells, by the ab- 

 sence of a cuticular lining, and by the production of 

 the inner layer of the muscular tunic, which forms the 

 apparatus for closing the orifice of the primary cells. 

 The third cavity, therefore, which could not have been 

 recognized as a distinct compartment in the llama, and 

 which undoubtedly receives the remasticated food in 

 the camel, ought rather to be regarded as a peculiar 

 structure, to which nothing analogous is to be found in 

 the stomachs of the horned ruminants." 



13 



