344 SMITPISONIAN MISCELLANEOUS COLLECTIONS [vOL. 45 



parallel. The choan^e are wide, much wider than the greatest width 

 of the incisive foramina taken together. The bony palate is long, 

 exceeding in length the rather wide choanse. The pharyngeal vault 

 is low. 



In Nesolagits the incisive foramina are rather narrow, about as 

 wide as they are in Caprolagns; but instead of being triangular, 

 their sides are nearly parallel, in this respect resembling the incisive 

 foramina of Pentalagns and Pronolagus. Their greatest width 

 taken together is a little less than the choanal width and much less 

 than the length of the bony palate. 



In Oryctolagus the distance between the vertical plates of the 

 palate bones is less in proportion to size than in any other member 

 of the family Leporidse. The incisive foramina are narrow, their 

 greatest width not quite equal to the length of the bony palate taken 

 half-way between the median line and the dental alveoli, and much 

 greater than the distance between the lateral choanal walls. The 

 pharyngeal vault is high. 



Following is a summary of the relative sizes of the greatest width 

 of the incisive foramina, the length of the palate measured between 

 the median line and the dental alveoli, and the distance between the 

 two vertical portions of the palate bones : 



In Lirunolagus and typical Sylvilagus the width of the incisive 

 foramina, the length of the palate, and the width of the choanse all 

 about ecjual one another. 



In Romerolagns the width of the incisive foramina and the choanal 

 widths are subequal to one another and each is less than the length 

 of the palate. 



In LcpHS and Brachylagus the width of the incisive foramina and 

 the width of the choanse are much greater than the length of the 

 palate. , 



In Pentalagiis the width of the incisive foramina is less than half 

 the length of the bony palate ; the width of the choanse is not much 

 less than the length of the bony palate. 



In Oryctolagus the width of the incisive foramina about equals 

 the length of the palate, while the width of the choanse is less than 

 the palatal length. 



In Pronolagus the width of the incisive foramina is a little less 

 than the length of the palate ; the width of the choanse is less than 

 the palate length. 



In Caprolagns and Nesolagus the width of the incisive foramina 

 taken together is less than the length of the palate, and the length 

 of the palate is greater than the choanal width. 



