62 MR. ST. GEORGE MIVART ON HEMICENTETES. [Jan. 17, 



formed entirely by the alisphenoid. The optic and sphenoidal 

 opening is hidden by an alisphenoidal lamella. There is no long 

 bony canal for the optic nerve to traverse, as in Erinaceus, nor is 

 there any suboptic foramen, nor any conspicuous orbital one. There 

 is an alisphenoid canal, with its posterior aperture situated just in 

 front of the foramen ovale, but it is much less conspicuous than in 

 Centetes. There is no external alisphenoid canal. There is a di- 

 stinct posterior palatine foramen on each side. The spheno-palatine 

 foramen is hidden, unless it appears as a minute opening in the lower 

 part of the large infraorbital canal. The anterior palatine foramen 

 on each side is relatively rather large. The infraorbital foramen is 

 exceedingly large, very much larger relatively than in Centetes, 

 bounded above by a very delicate spiculum of bone. The lachrymal 

 foramen opens immediately behind the summit of that delicate 

 spiculum. 



There are two small foramina on the outer side of the very slender 

 horizontal ramus of the mandible ; the more anterior beneath the 

 first premolar, the more posterior beneath the first molar. 



The dental formula is : — 



I. S, C. g, P.M. « M. iEi=U=40. 



The upper incisors on each side are all separate from each other 

 and from the canine ; and the first upper incisor is also separated by 

 an interval from its fellow of the opposite side. 



The first two incisors on each side are of nearly the same size and 

 shape. Each is conical, pointed, and much hooked, with a very large 

 posterior lobe. 



Teeth of upper jaw, four times the size of nature. 



The third incisor is much shorter, gradually broadening down- 

 wards from the socket to the distal edge. 



The canine is shaped like the first two incisors, but rather larger, 

 and with the posterior lobe relatively smaller. It i3 very much 

 smaller, relatively as well as absolutely, than in Centetes. 



The first premolar, in shape and size, is very much like the 

 canine, though separated from the latter by an interspace, which is 

 about three times as long as that which divides the canine from the 

 third incisor. 



The second premolar is shaped like the first premolar of Centetes. 

 It is separated from the first premolar by an interval still greater 

 than that which divides the first premolar from the canine. 



It has a posterior talon, but no internal cusp. Compared with the 





