PALiEOMASTODON WINTONI. 



151 



incisors are wanting but which is otherwise nearly complete (text-fig. 64), may be 

 regarded as a co-type. 



This species differs from P. headnelli in (1) its somewhat smaller size; (2) the 

 extension backwards of the symphysis so that its posterior border is only just in front 

 oipm. 3 ; (3) the position of the mental foramen on the side of the symphysis instead 

 of behind it ; (4) the greater complication of the molars and their greater length in 

 proportion to the width, the last lower molar (text-fig. 50 B) consisting of three 

 transverse crests and a distinct talon. From P. minor and P. parvus this species is 

 easily distinguished by its larger size and the difference of its last lower molar (see 

 textrfig. 50). 



P wintoni seems to be by far the commonest species, and probably the greater 

 number of specimens above referred provisionally to P. beadnelli belong here. This 



Text-fiff. 53. 



COTUtr 



Mandible oE Palceomastodon wintoni, type specimen, from abo\ e. 



cond., condyle ; cor., coronoid process ; d.c, dental canal ; i., incisor. The premolars and first molar 

 on the left side have been restored from another specimen, i nat. size. 



remark particularly applies to the skulls and upper teeth, which, in the absence of 

 associated skulls and mandibles, cannot be determined with certainty ; though the 

 absence of any mandibles of the type of P. headnelli from the pits in which most 

 of these specimens were collected is strong presumptive evidence that they do not 

 belong to that species, but to the present one, to which all of.nearly all the mandibles 

 and lower teeth are referable. 



Form. & Log. — Fluvio-marine beds (Upper Eocene) : north of Birket-el-Qurun. 



M. 8414. Mandible wanting the angular region and the cheek-teeth in front of m. 2. Type 

 specimen figured (text-figs. 50 B, 53). The incisors are preserved ; they are procumbent 

 and spatulate teeth terminating in a point ; their width at the base is 5"2 cm., the length 



