4 IS 



MR. R. I. rOCOCK OX TllK EXTERNAL 



(H.staiice below the tail, but it is not overlapped by a projecting 

 flap of integument. The anal glands were not detected in the 



Text-figure 28. 



'r):^"^' -.,." \ 



Vi''i& 





A. Anal region of Sydrocltoerus capyhara, 2 , with tlie orifices of the anus, 



anal glands, and genital organs pulled apart. 



B. The same of Cavia porcellns, $ . 



C. The same of DoUclwtis patagonica, ^ (? immature and unpaired). 



D. The same of Ccelogem/s paca, $ ad. 



E. The same of Ctenodactyhis gundi, $ ad. 



a, anus; ag, anal gland ; g, common genito-urinarj' orifice; p, prepuce 

 with urinary orifice: t, tail; v, vulva. 



single spirit-preserved example examined ; but, according to Tull- 

 berg, the gland resembles that of Octodon. (Text -fig. 25, A.) 



