66 



BOOBY GANNET. 



some distance adove the junction of the sterno-trachealis witli the trachea, and passing below it, adheres to 

 the first tracheal hall' ring, see Fig. 14, u. Below this muscle, and rendered tense by it is a hiryngeal vibra- 

 ting surface, see Fig. 14, u. 



The bronchial tubes are composed of twenty or more half rings and adhere together at their laryngeal 

 junction, for the space occupied by five half rings. Below this are small tympaniform membranes. 



The oesophacrus of the Booby Gannct is dilated, and opens into a wide proventriculus which is 1.80 long 

 and which enieriies into the stomach without any constriction. See Fig. 14, where is given the stomach and 

 adjacent organs,"about two thirds life size; the proventriculus begins at a point just below g, where is given 



Fig. 13. 







L 



//'- 



^l'^'%u^ 



Young of Cory's Gannet, Sn.A coryi, two days old, taken on Little Cayman, April 20, 1,888. 



a small portion of the gullet, and extends to a point about opposite p. The proventriculus at its junction with 

 the stomach, is .70 in diameter. The glands are placed in five longitudinal ridges, and are simple and cylin- 

 drical in form. 



The stomach is a cylindrical sack with soft, thin walls and lined with a soft mucous membr.ane that is 

 raised in five ridges, coutniuous with those of the proventriculus. Its length is eipi.tl to that of the proven- 

 triculus. 



The intestine emerges from the stomach at a point about one half its length from the terminal end which 

 thus becomes a cul-de-sac, see Fig. 14, x; it passes upward for 1.00, then bends downward for 2.,S.->, again 

 bending upward, forms part of the duodenum which measures about 3.00 in length. 



The pancreas occupies less than one half of this fold, the upper; see ib. p. Its length is 1.70. 

 The intestines are not long, and there arc slightly developed coeca, ib, B, z, where it is represented as 

 being life size, g, being the intestine and y, the rectum. 



