584 MR. F. E. BEDDARD ON THE ANATOMY OF [May 26, 



present in at least two of the subsequently dissected examples 

 of Hyrax capensis, but the actual excavation to form a pocket 

 was hardly at all marked. I may further remark that the 

 cavoduodenal ligament ended some little way in front of the 

 posterior angle'of the duodenum*. In all the other points 

 treated of in the above description of the intestinal tract of 

 Hyrax, I found these three examples precisely like those 

 originally dissected. It will be observed that my account sub- 

 stantially bears out that of George t, though adding some details. 



RODENTIA. 



As I have dissected a considerable number of Rodents with 

 a view to the accurate mapping of their intestinal resemblances 

 and differences, I may be permitted the following remarks, 

 which, however, contain observations that are partly in accord 

 with those stated at first hand, or as a result of agreement with 

 others, by Tullberg. 



Among the Sciuroidea I have examined the following species, 



viz. : Cynomys ludovicianus, Tamias striatus, Scmrus maximus, 



Sciurus macrurus, and /Sciiorus cinereios (text-fig. 116), of which 



the second has been also examined by Tullberg as well as 



the Common Squiri-el and some genera which I have not 



seen. Tullberg has not described or figured the ans8e coli of 



Cynomys. They are typically like those of other Squirrels. 



That is, there are two permanent loops, of which the first 



is very much the longer. In Tamias striata I find conditions 



rather different from those described and figured by Tullberg, 



He describes " nur ein rechte parallelschlinge," but figvn-es two 



such loops of which the first, i. e. that nearest to the CEecum, 



is the shorter, though both are not so marked as in his 



figure of Sciurus vulgaris. I find in an example of this species 



two loops, the usual arrangement in Squirrels. Of these the 



first, that nearest to the caecum, is of considerable length ; 



and the second is much shorter and also much wdder, its 



constituent tracts of colon being further away from each 



other than is the case with the anterior ansa coli. Apart 



from the shortness of both ansfe, especially the second, the 



colic loops of this Squirrel are like those of Sciurus maximus, 



where there are two ; the longer of these next to the cfecum is 



actually six inches in length, with the two lengths of intestine 



closely approximated ; the second loop is very much shorter but 



much wider ; thereafter the rectum is nearly straight. In 



Sciurus niacritrus the arrangement is nearly identical, but the 



shorter loop is composed of more closely approximated limbs ; 



so too with Sciurus tennanii (W. A. Forbes MS.). In Sciurus 



* This state of affairs would seem to be impossible until it is recollected that 

 the ascending limb is tightly fastened down to the right kidney as it passes over 

 the viscus. (See above, p. 580.) 



t Ann. Sci. Nat. (6) i. 1874. 



