144 External Characters of Ruminant Artiodactyla. 



the cxtcnsiou beneatli the inuer angles of the nostrils in 

 front is wider. 



In i\\e penis (fig. 4, A) the glandular termination is more 

 elongate and less bulbous than in Cupra and the filiform 

 termination of the urethra is shorter. It is the shortest, 

 indeed, that is found within the limits of the Caprinaj. 



The subcaudal (jiand is represented externally by a shallow 

 depression above and at the sides of the anus. 



Note on the Penis of the Cephalophinse and Neotragina3. 



In my paper published in the issue of this Journal for 

 June 1918, 1 regret that I overlooked at the time Lonuberg's 

 descriptions and figures of the penis of Cephalophus natal- 

 ensis and of Sylvicapra grimmia (Ark.Zool. Stockholm, (5) v. 

 no. 10, pp. 2-3, figs. 1-2, 1909). He shows that in C. natal- 

 ensis the urethral canal has a very long filiform prolongation 

 resembling that of Guevei niaxwelli figured by Garrod 

 (P. Z. S. 1877, p. 10, fig. 20), whereas in S. grimmia the 

 tubular prolongation is quite short, only overlapping the 

 glans to a small extent. Now, C. natalensis is so closely 

 related to C. dorsalis as hardly to admit of a doubt as to 

 identity in the structure of the penis in the two species. In 

 that case the penis of C. 6?o/-5«//5 I described as being without 

 the tubular urethral prolongation must have been defective, 

 owing to mutilation. Lonnberg's observations show that 

 Cephalophus differs from Sylvicapra not by the suppression 

 of the urethral prolon^^ation, as I stated, but by its develop- 

 ment and length, which affiliate the former genus with 

 Guevei. 



In the case of the Neotragiufe, it may be recalled that 

 Garrod {op. cit. p. 11, fig. 21) described the penis of 

 Ourebia nigricaudata as possessing a long slender urethral 

 prolongation considerably overlapping the slender tip of the 

 glans penis, nhereas, according to Lonnberg's observations 

 [op. cit. p. 4, figs. 3-4), the urethra does not surpass the tip 

 of the glans in Raphicerus cumpestris and Neotragus living- 

 stonianus. The penis of the example of Nototragus mela- 

 notis in which I found the preputial gland agrees with that of 

 Raphicerus campestris. 



