VISCERA OF AN OKAPI. 



205 



than that of the various other Ruminants figured by Corclier *. 

 All four chambers (rumen, reticulum, psalterium, abomasum) 

 are fully developed. 



The paunch (rumen) is subdivided by folds into secondary 

 chambers in a manner similar to that of Domestic Ruminants, 

 and is lined throughout by coarse papilla; (text-fig. 20), mostly of 

 large size and flattened lanceolate form, like those in the rumen of 

 the Giraffe. Upon the free edges of the dividing partitions the 

 papillae are reduced in height and resemble flat scale-like plates 

 rather than papilla?. 



Text-figure 19. 



Outline of the stomach of Okapia, with the cavities opened. 



ab., abomasum ; duo., duodenal dilatation ; oss., oesophagus ; ces.g., oesophageal 

 gutter ; psal., psalterium ; pyl., pylorus ; r., longitudinal rugae in aboma- 

 sum ; ret., reticulum seen through opening from the rumen ; ret/, outline of 

 the reticulum ; spl., spleen. 



The reticulum is a roomy, oval chamber, and is remarkable, like 

 that of the Giraffe and A nfAlocapra f, for the extreme shallowness 

 of its cells (text-fig. 21). In this particular it is approached by 

 the reticulum of many Deer, and offers a striking contrast to that 

 of Domestic Ruminants and the majority of Antelopes. 



The psalterium is large, of about the same size as the reti- 

 culum, and contains some 14 chief laminae. The spaces between 



* Cordier, Ann. des Sci. Nat. t. xv. 1893, pi. 6. 

 f Murie, Proc. Zool. Soc. 1870, p. 349. 



