VISCERA OF AN OKAPI. 



205 



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

 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 papillfe (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 pai^titions the 

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

 rather than papillfe. 



Text-figure 19. 



SPL 



PSA?. 



IMX> 



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



ab., abomasum ; duo., duodenal dilatation ; aes., oesophagus ; ces.ff., oesophageal 

 gutter ; jpsal., psalterium ; pj/l., pylorus ; r., longitudinal rugse 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 GirsiSe and Aiitilocajn'a'f, for the extreme shallowness 

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

 the reticulum of many Deei-, 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. 

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



