586 



MR. F, 



E. BEDDAED ON THE ANATOMY OF [May 26, 



narrow, and beyond the colon and rectum lay in loosely coiled 

 folds which could of course be straightened out. In the other 

 example, a male, the ansa jxiraccecalis was very large and wide 

 and commenced immediately after the csecum, ending only with 

 the commencement of the ansa coli clextra ; the latter was long 

 and narrow as usual, and the rest of the colon, instead of being 

 gathered into temporary folds in a comparatively limited space, 

 ranged, so to speak, throughout the entire colon in a series of 

 broad loops. 



Text-fig. 117. 



Part of alimentary tract of Aulacodus. 

 c.d. Ligamentum colico-duodenale. O, O'. Omentum. 



Atdacodus sivindernianus is one of the types of Hystricomorphs 

 not dealt with by Tullberg as regards the points under discvission. 

 I may therefore record the results of a dissection of two examples 

 of this Rodent. Immediately after the caecum there is a single 

 enormous loop measuring quite a foot long, which is followed 

 by a nearly straight colon and rectum. I am uncertain 

 ■whethei- this fold is to be looked upon as the paracsecalis or 

 one of the ansas coli, dextra or sinistra. Garrod does not seem to 

 have mentioned it in his account of the viscera of this animal *. 



I figure this loop of Aulacodus (text- fig. 117) since it differs 

 in vai-ious details from that of any other Rodent known to me. 

 It will be observed that the two limbs of the loop running 

 parallel to each other and at no great distance are fringed on 



* P Z. S. 1873, p. 786. 



