ON THE “ SHOW-OF” IN BUSTARDS. 245 
—a condition I have not seen in any other bird; Ofis tarda and O. 
macqueent have two, and Tetraz campestris the left only. Most pro- 
bably the presence of a right carotid only is charaoteristic of the genus 
Eupodotis. 
a FURTHER NOTE ON THE MECHANISM OF THE 
« SHOW-OFF ” IN BUSTARDS.* 
Ir is the uncertainty with which my material comes to hand which Page 673. 
must be my excuse for having so soon to present a further note on the 
“ show-off ” in the Bustards. 
A young male specimen of the Great Bustard (Otis tarda) has 
recently died in the Society’s Gardens; and one or two observations 
which I was able to make on its gular arrangements have done much 
to clear up, in my mind, the difficulties connected with that some- 
what involved subject. My previous communication on this point 
(‘‘ Proceedings of the Zoological Society,” 1874, p. 471)+ contains a 
~ drawing of the esophagus, trachea, and gular pouch of a Spanish 
specimen of Ofis tarda, kindly given me by Lord Lilford. In the 
description appended to the woodcut it is remarked that the crop is 
peculiar, in that it springs from the posterior instead of the anterior 
wall of the cesophagus ; and I may mention that it is further peculiar 
in not being quite median, as would have been expected. 
I do not know the age of the young male bird above referred to, - 
which I have recently examined. It seemed of nearly full size, had 
been in the possession of the Society between three and four months, Page 674. 
had never shown off, and had no lateral tuft of feathers from the sides 
of the lower jaw. 
In it the esophagus was uniformly cylindrical, with no trace of a 
crop, and there was no gular pouch. On looking under the tongue, 
however, it was evident that the arrangement of the sublingual struc- 
tures was quite peculiar. In the male of Eupodotis australis, as I 
have previously remarked,} the frenum lingue is well developed in the 
normal manner as a median vertical fold; and, what is more, it is 
situated as far forward as in most animals, not behind the level of the 
* “Proceedings of the Zoological Society,” 1874, pp. 673, 4. Read, Dec. 1, 
1874. 
+ (Supra, p. 242.) 
} “ Proceedings of the Zoological Society,” 1874, p. 472. (Opp.) 
piel getre i: 
