154 INSECTIVOEA. 



the second, and differs from it in having only two apices to the middle ridge, and 

 only one internal cusp. The fourth molar is extremely minute, and presents only 

 two ohscure cusps, one anterior and the other posterior. 



The first incisors of the lower jaw project forwards and upwards, the terminal 

 fourth of thek cro"nTis heing directed nearly upwards, and their tips are slightly 

 divergent, and theh posterior surfaces more or less concave, but quite smooth. 

 The crown of the second incisor is the lowest of all the mandibular teeth, and is 

 elongately oblong when viewed externally, and is laterally compressed. The canine 

 is a httle longer and more pyramidal, the crown being surmounted by a conical 

 point. The fu"st molar has three external cusj)s, the first and last being' nearly on the 

 same level, and the central being pyramidal and dhected backwards. The latter 

 by its inner margin is connected by a short ridge to the anterior inner cusp, wliich 

 is immediately internal to it, rather sharply pointed, and nearly as high as itself. 

 The posterior internal cusp is opposite the last external cusp, but has on its outer 

 margin another short cusp between itself and that cusp, so that this tooth has six 

 cusps in all. The second molar is formed exactly like the first, but is much smaller. 

 The thu'd molar is about one-third the size of the second, and the cingulum is well 

 marked along its outer side. It developes two cusps, one small, anterior, and one 

 large, posterior and conical, and connected to the former by a short ridge more 

 internal than external to it. 



Measurements of the skull. -^^^^^^ 



Superior margin of foramen magnum to tip of premaxillaries ...... 1-04 



Inferior „ „ „ „ „ „ „ -92 



„ „ „ „ „ „ posterior margin of palate ..... -44 



Length of palate ............... -45 



„ „ mesopterygoid fossa to posterior margin of post-glenoid process .... "21 



Breadth of „ „ anteriorly .......... -Qfj 



„ „ >, „ at middle .......... -04 



„ „ „ „ posteriorly -08 



Distance between post-glenoid process ........... -11 



„ „ tympanic rings ............ -13 



Breadth of palate between last molars ........... -17 



„ „ „ „ first and second incisors ........ '04 



Length of alveolar surface ............. -44 



Breadth across mastoid process -53 



„ at inferior extremity of lambdoidal suture (paroccipital process). .... -33 



,, before superior glenoid surface ........... -29 



„ on a line behind alveolar surface of upper jaw ........ -25 



„ across infraorbital foramen (alveolar margin) ........ -30 



„ at canine ............... '19 



„ at first incisor ............._ •]^4 



Superior margin of foramen magnum to lambdoidal suture ....... -18 



Length from lambdoidal suture to end of nasals ■•....... -83 



„ „ „ „ „ „ premaxillaries ........ 1.00 



„ of sagittal crest ■■•......,... -47 



Angle of lower jaw to symphysis ••-....... '54 



Length of process of angle ••■....... '06 



Depth under last molar ........... -j^g 



,, of ramus through ooronoid •■•......,. '30 



Breadth of notch between coronoid and superior division of condyle ..... -13 



" " " " inferior „ „ „ ,, .... -13 



