lvon] the hares and their allies 407 



Teeth essentially as in Lcpiis, except first lower premolar which has 

 two or more reentrant angles on anterior face. 



Skull (pis. Lxxvi, 3, 6; Lxxxvii, 4; lxxxviii ; lxxxix, 6-10). — 

 The genus Liinnolagus possesses postorbitals quite different in 

 form and attachment from the postorbitals of any of the other 

 genera of the Leporidae. The whole process is fused to the 

 side of the frontal bone, so that only a very minute notch is 

 found anteriorl)', and no notch, foramen, or slit is found pos- 

 teriorly, except in rare and anomalous cases, in which a small fora- 

 men may be formed by incomplete fusion of the postorbital with the 

 side of the skull. The fused postorbital process has about the same 

 general shape as has the unfused process in the genus Sylrilagiis. 

 An atypical specimen (No. 64,029, Kissimmee. Florida) show^s 

 the manner in which the process is attached. The hind-end of the 

 process, instead of meeting the skull directly as it does in those genera 

 where the posterior end of the process is in contact with the side 

 of the skull, is met by an outgrowing process from the cranium. In 

 this specimen a small foramen is enclosed between the posterior 

 part of the postorbital process and the above outgrowing process 

 from the cranium. A more or less prominent blunt projection, not 

 seen in the other genera, is formed by the union of the postorbital 

 process with the outgrowing process from the cranium. The blunt 

 projection above, together with the root of the zygomatic process 

 just below, forms a rather conspicuous notch. 



The interparietal is present as a distinct and separate bone. 



The bony palate is relatively long, about as it is in Oryctolagus, 

 longer than in Lcpus or Syhnlagns, shorter than in Pronolagus or 

 Romerolagus. The horizontal plate of the palate bone is relatively 

 well developed, to about the same extent as in Oryctolagus, forming 

 between a third and a half of the bony palate. The portion of the 

 palate bone bordering the maxilla caudad of the posterior edge of the 

 bony palate is moderately well developed, much better than it is in 

 Lepus, much less than it is in Rouicrolagns. The posterior palatine 

 foramina, of moderate size, are located at the anterior outer angles of 

 the horizontal plates of the palate bones. The choanse are moder- 

 ately wide, narrower than in Lcpus, but not approaching the extreme 

 narrowness seen in Oryctolagus. The length of the bony palate 

 taken midway between the median line and the dental alveoli is about 

 equal to the width of the choanas and to the greatest width of the 

 incisive foramina taken together. 



The zvgoma is heavy, thick, and deep, its antero-inferior angle 

 is much expanded and flares outward, more so than it does in any 



