E. LÖNNBERG, MAMMALOG Y OF ECUADOR. 81 



that both rami of the mandible also in the former are mov- 

 ably conneoted with each other in the symphysial tract. 

 The struoture of the palate of Caenolesies is of interest. Pa- 

 pilla incisiva is comparatively large and occupies most of 

 the space between i^, but extends a little further backwards. 

 Behind the same are seen some small scattered papillae. 

 Then foUows a space occupied by three palatal ridges, which 

 are strongly convex in direction forwards. The foremost 

 of these is most strongly developed. Its lateral, somewhat 

 thickened ends begin just in front of the first premolar, but the 

 bow extends to the space between i^, The third ridge does 

 not reach so far laterally, but its lateral ends rise a little in 

 front of the second premolar. The second ridge, which is 

 more weakly developed, is situated a little nearer the third 

 than the first fold. In the interspaces between these ridges 

 some small papillae are scattered. Behind these curved 

 ridges follows a region with straight transverse ridges 7 in 

 number. The foremost of these runs straight across from 

 p^ to p^. The second runs in a similar way between the 

 p^y the third between the m^ (at their middle). These three 

 ridges have a smooth anterior margin and in the interspaces 

 between them as well as behind the last is a regular transverse 

 row of small papillae. Behind the last of these follows three 

 transverse ridges with their anterior margin crenulated. The 

 first of these runs across between the anterior corners of the 

 m^, the second has a similar relation to the m^, and the 

 third behind the same (in the adult animal probably between 

 m^). The seventh transverse ridge, which again has a smooth 

 margin, is situated a little further back, and behind the same 

 is a regular transverse row of papillae just as between the 

 anterior transverse ridges. This palatal pattern is thus very 

 regular. If it is compared with the corresponding one of 

 other mammals, it proves to resemble that of the Macropo- 

 didae very closely. According to the beautifully illustrated me- 

 moir by G. Retzius^ the members of this family have three 

 or two (in which case the middle one probably is suppressed) 

 curved anterior ridges, and in the molar region 6 — 7 straight 

 transverse folds. The arrangement of the papillae between 

 the folds is also similar. The palatal pattern of Eudromicia 



^ Biol. Untersuchungen. Neue Folge. Vol. XIII, Stockholm 1906. 

 Arkiv för zoologi. Band Ii. N:o 4. 6 



