STUDIES OF THE MACROCHIEES. 



347 



flexor longus halhocis enjoyed a greater degree of freedom than 

 had been found by the anatomist just quoted to exist in Buceros 

 rhinoceros, which I believe to be as he found it in Caprimulgus ; as 

 in Chordeiles, it is easily separable from the deep flexor along its 

 side, thus approaching somewhat more nearly the condition as 

 found in Momotus lessoni. 



Other Notes. 



Cuvier, Nitzsch, and Beddard (P. Z. S. 1886, p. 147) have 

 all made careful examinations of the syringes of the Gapri- 

 mulgi; and the tracheo-bronchial syringes of Caprimulgus and 

 Chordeiles are well known. I have investigated this part of the 

 anatomy of the forms before me, and find they agree in all parti- 

 culars with the descriptions given by the above authorities ; all of 

 which will obviate the necessity of my entering upon further 

 details here. Beddard's paper, just alluded to, is a real contri- 

 bution to the anatomy of these parts for the Caprimulgi, and will 

 well repay reading in the present connection. 



Antrostomus has two carotids present, taking the usual course 

 up the neck in the mid-vertebral canal. This agrees with what is 

 already known for Caprimulgus and Chordeiles ; and I verified the 

 fact in the latter bird in the specimen at hand. 



Intestinal caeca are present in both Antrostomus and Chordeiles, 

 being in each case a long slender pair (fully 4 centimetres in 

 length), and each about one half the calibre of the intestine to 

 which they are attached. 



Upon investigation I find that Antrostomus possesses a small 

 gall-bladder, while the several species of Chordeiles lack this 

 organ : this confirms the observations of Mr. Beddard, who found 

 that in the latter case Garrod had also left a MS. note to that 

 effect (P. Z. S. 1886, p. 151). 



The form of the oesophagus and stomach is pretty much the 

 same in both the Whip-poor-will and Nighthawk, although as 

 regards size it is comparatively larger in the latter bird. I find 

 it to be a flask-shaped pouch, somewhat compressed from side 

 to side, with the walls of a fairly uniform thickness, and com- 

 posed of strong rugse. These, commencing at the lateral tendinous 

 centres at either side, curl round and round in double loop until 

 they come to the oesophageal tube, which they ascend for a short 



LINN. JOUEN. — ZOOLOaY, YOL. XX. 27 



