84 



MR. F. E. BEBDARD ON THE 



upon each other, and twisted and doubled in a compHcated 

 fashion." It is easy to state the characteristics of the Psittacine 

 alimentary tract, which in the species and genera Ara ararauna, 

 A. militarise Nestor notabilis (see text-fig. 28), Chrysotis i/nornatus, 

 Psephotus hcer)iatonott(,s, Callocephalon galeatum, Platycercus 

 flaveolus, Cacatua sulphurea, is constructed as follows. 



The duodenal and ileic loops are single and elongated, as shown 

 in Mitchell's figure, The jejunal loop consists of, pi-oximally, a 

 series of three loops one within the other, of which the ascending 

 limbs of two are connected respectively wdth the duodenal and 

 ileic loops, and, more distally, of two sepai-ate single loops longer 

 than those of the proximal bunch, which are not directly con- 

 nected with each other but with the loops of the proximal packet. 

 The illustration will explain these interconnections better than a 

 more elaborate description, 



Text^fiff. 28. 



llitestinal tract of l^estoi" notabilis. 

 Lettering as before. 



While there is in the species mentioned the general uniformity 

 of structure which has just been explained, there are differences 

 of small detail. Thus the two species of Ara differ, in that the 

 proximal complex of loops in A . ararauna consists of only two 



