ALIMENTARY TRACT OF CERTAIN BIRDS. 



53 



to the nioie di.st;)! of the two. They ai'e closely attached to each 

 other and to the duodenal by ligament and cannot be freed with- 

 out cutting' or tearing. There is, in fact, every reason to regard 

 these two loops as a subdivision of the usually single ileic loop. 

 Moreover, the ileic loop is occasionally double in other birds ; it is 

 distinctly formed of two parallel loops \i\ Anthroj^oides pa7-adisea*. 



Text-fi<r. 10. 



Intestinal tnu:t oi C'rj/ptuyiis tataupa. 

 Lettering as in text-fig. 9. 



It is to be noted also that the ventrally situated of the two sub- 

 divisions of the presumed ileic loop is attached up to nearly its end 

 by ligament to the duodenal loop. There is no case known to me 

 among birds wheie the jejunal loop is thus attached. 



Another argument of the saiue kind is to be derived from a 

 consideration of the intestinal tract of the Passerine Ixocincla 

 craasirostriti. In this BuIIduI, of which I have dissected only one 



* Vide p. 82. 



