420 E. S. GOODRICH. 



hinder portion only of the ramus, with three molars in situ. 

 It has been figured in outline by Phillips (24), and mentioned 

 by Osborn (15). As the latter notes, it is remarkable for the 

 great development of the coronoid process. The articular con- 

 dyle is slender and very well preserved ; and the broken angle, 

 which I have recently cleared from the matrix, can be clearly 

 discerned. From the fractured surface we may conclude that 

 the angle was very much inflected, and exceedingly thin and 

 flat near its point of attachment ; unlike the same process in 

 living Marsupials, it was situated entirely behind the dental 

 foramen. In front of the teeth are the impressions in the 

 matrix of the two anterior molars. 



Genus Amphilestes. 



Of this genus there are three specimens, included in one 

 species, two of which are in the Oxford Museum, and one in 

 the museum of the Philosophical Institution at York. 



Amphilestes Broderipii, Owen. 



The type specimen in the museum at York; a left ramus 

 with the inner surface exposed (PI. 26, fig. 5). 



Valenciennes was the first to mention this fossil in 1838. 

 He says, " Une autre machoire, que je crois etre de cette 

 derniere espece [Phascolotherium Bucklandi], fait partie 

 du cabinet de M. Sykes" (31). The Rev. H. Sykes pre- 

 sented it to the museum in which it now rests. Valenciennes, 

 " d'apres le dessin qui a ete envoye par M. Phillips h M. 

 Cuvier,^^ mistook it for a right ramus seen from the outside. 

 Owen, in the same year, described it briefly under the name of 

 Amphitherium Broderipii,^ giving an elaborate but in 

 some respects erroneous and misleading figure (19), which has 

 since been frequently copied in his own and other writers' 

 works (20 — 23). In this, and in all his subsequent 

 figures, Owen represents the angle of the jaw as separate and 

 hardly inflected (as in Amphitherium), and the coronoid pro- 



* Owen remarks that it appears to be closely allied to Phascolotherium. 



