1909. ] ANATOMY OF CERTAIN UNGULATA, 183 
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terminal portion is the outgoing spiral, precisely as in Cephalophus 
maxwelli. It is not at all surprising-—if the facts be properly 
considered—to find that Cephalophus dorsalis and C. maxwelli 
are not near akin in the nature of their colic spirals. The 
Text-fig. 13. 
a 
fa 
The colic helicine in various Artiodactyles, arranged in two series, 7.e. 1, la, 18, 
and 2,2a,26. The cecum is represented to the right and the ingoing limb 
of the spiral is black. The outgoing limb of the spiral is left uncoloured. 
1. Madoqua phillipsi. 1a. Cephalophus dorsalis. 16. Moschus moschiferus. 
2. Tragulus stanleyanus. 2a. Cephalophus maxwelli. 2b. Antilocapra 
americana. 
differences in external characters appear to me to be quite as 
great as those which distinguish certain other genera of Antelope, 
