RECORDS VOLUME XI, JAN., 1919. 13 



Fig. 2, page 12. Cory Gannet. A, larynx ; q, glotits ; 

 e, septum. F, tongue; c, point: h, h, thyro-hyals; s, glot- 

 tis : q its opening ; m, trachea. U, syrinx ; s, sterno-trache- 

 al ; m. trachea; e. bronchialis; b, bronchial tube. B, vesti- 

 gal coeca: g, intestine; y, colon. 0, syrinx of Booby 1-2; 

 letters as in IT. D, stomach etc. of Cory Gannet 1-2; g, 

 gullet ;w, spleen; i, intestine p, pancreas: x, stomach. 



The cries given by the Gannet are loud 

 and raucous and, as the small vibrating sur- 

 faces on the syrinx are probably function- 

 less on account of the thymus gland, must 

 be produced by the tympans. It is proba- 

 ble that the notes may be modified by the 

 trachea which may be in some degree reso- 

 nant. It is also possible that the thin laryn- 

 geal septum may likewise modify it. If this 

 be true, an interesting question arises as to 

 where the vocal organs of primitive birds 

 were situated. For example, if Archaeopter- 

 yx w^ere capable of producing vocal sound 

 were the instruments by which it was pro- 

 duced laryngeal or syringeal? 



CORY GANNET, Snla coryi. 

 In external characters this species seems 

 quite closely allied to the Gannet, but the 



