lyon] the hares and their allies 343 



Wide choanoe are found in Lepus and Brachylagus. They are 

 remarkably wide when compared with the narrow choanse of Orycto- 

 lagiis. In both of the former the length of the bony palate, measured 

 midway between the median line and the dental alveoli, is decidedly 

 less than the least distance between the two vertical plates of the 

 palate bones. In the same two genera the incisive foramina are 

 wide, especially so in Brachylagus, where the greatest width of each 

 incisive foramen nearly equals in length the bony palate measured 

 midway between the median line and the dental alveoli. In Lcpus, 

 the greatest width of the incisive foramina taken together is much 

 greater than the length of the bony palate. 



The choanse are wide in Sylvilagus, but not quite so wide as they 

 are in Lcpus and Brachylagus. In certain species of Sylvilagus, 

 arizona; and its allies, the lateral walls of the choanse are more ap- 

 proximated than they usually are in most rabbits, and approach 

 the narrow^ choanae seen in Oryctolagus. The length of the bony 

 palate taken midwa}' between the median line and dental alveoli 

 equals the greatest width of the incisive foramina as well as the 

 distance between the choanal walls. In the Syhilagus ariconcc 

 group this palatal length is less than the width of the incisive 

 foramina, but equals the distance between the choanal walls. 



In Limnolagus the length of the palate taken between the median 

 line and the dental alveoli about equals the greatest width of the 

 incisive foramina taken together, and the distance between the 

 vertical plates of the palate bones. The choanse are narrower than 

 they are in Lcpus, but are not so extensively narrowed as they are 

 in Oryctolagus. 



The length of the relatively long bony palate of Rouicrolagus is 

 very much greater than the greatest width of the two incisive 

 foramina and also very much greater than the choanal width. 



In the genus Prouolagus the incisive foramina are long and 

 narrow, less triangular in outline than they are in most of the 

 Leporidne. Their greatest width is much less than the length of 

 the bony palate. The choanae are rather narrowed, being almost 

 as narrow as they are in Oryctolagus, but the pharyngeal vault is 

 not so high as it is in the latter genus. 



In the skull of Caprolagus, as figured by Blyth, the incisive 

 foramina are narrow, elongated-triangular, the choanse are mode- 

 rately wide, about as wide as the greatest width of the narrow 

 incisive foramina taken together. The bony palate is long, de- 

 cidedly longer than the choanal width. 



In Pcntalagus the incisive foramina are narrow, their sides nearly 



