INSECTIVORA. 205 



The third premolar consists of an external strongly compressed lobe 

 and an internal keel or wide cingulum. The posterior third of the exter- 

 nal lobe is reflected outwards, inclosing a groove Avith the anterior part. 

 The latter rises into an apex, which is separated by an open notch from the 

 posterior portion. The latter has a superior convex edge, and both lobes 

 together present a convex face inwards. The internal lobe is low and sends 

 a ledge continuous with its apex along the posterior base of the crown. Its 

 prominence inwards gives the base of the crown a triangular outline. 



The fourth premolar is generally similar to the true molars in its trans- 

 versely elongate form, and the production outwards of the anterior external 

 base of the crown as well as the posterior external angle. It differs from 

 them in that the principal external cusp is single and not double, and in the 

 absence of a well-defined posterior internal ledge. On this account the 

 internal angle is more nearly median than in the true molars. There are 

 rudimental antei'ior and posterior cingula on the inner part of the crown. 

 The principal cusp is compressed and acute, and stands well within the ear- 

 like external expansions of the base of the crown. In the true molars there 

 is a rudimental anterior cingulum. The principal cusps are compressed and 

 well separated, though connected at their bases ; those of the first not more 

 so than those of the second, contrary to Avhat is seen in E. acutidens. The 

 posterior external ear-like lobe is a little longer than the anterior in the first 

 molar; a little smaller in the second, and much smaller in the third. Enamel 

 smooth. 



The inferior molars do not differ much from the corresponding teeth of 

 E. bisidcatus. The anterior limb of the anterior V is not so elevated as the 

 posterior limb, but more so than the posterior V. On the last molar the 

 intermediate lobes are well developed, but the external is much the larger. 

 The anterior V of the fourth premolar has not as great transverse extent as 

 the anterior V of the true molars, but it is well developed, and not a cutting 

 lobe, as in E. acer. The third premolar has an anterior cutting lobe and a 

 posterior keel with a cutting edge continuous with that of the principal lobe. 

 The anterior edge of the latter is convex and rises to the acute apex. The 

 second (first) premolar is two-rooted ; crown lost on both rami. The inferior 

 canine has a robust base, and issues close to the first premolar. Crown broken^ 



