AI>IMEN"TARY TRACT OF CEUTAIX BIRDS. 



79 



irlentified with that short loop which he has termed the " supra- 

 cpecal kink." In a second specimen, all these characters wei-e 

 quite as plain, so that it cannot be held that the first individual 

 was in any way abnormal. Probability, at any ra.te, indicates this 

 conclusion. A third example, a quite young and immature bird, 

 presented some slight differences which led me at first to suspect 



Text-fisf. 26. 



Intestinal tract of Fratei'cula arctica. 

 Lettering as before. 



a non-identity of species. I am assured, however, that this 

 suspicion is wrong. The only difierence concerned the two 

 jejunal loops. Of these the first, i. e. that immediately following 

 the duodenum, is much shorter than the second or more distal 

 loop. The latter, instead of being a simple loop equisized 

 Avith the first loop, is much longer and ha:s a kink, or sudden flexure 



