12 CHTROPTERA. 



M. 1637. Three specimens of the right maxilla ; from the Upper 

 Eocene of Caylux. The two complete specimens show the 

 minute pm. 3. Purchased, 1884. 



M. 1638. Two specimens of the maxilla; from the Upper Eocene of 

 Caylux. These specimens are rather smaller than any of 

 the others ; hut as the dentition is precisely similar, it is 

 not improbable that the difference in size is merely an 

 individual or sexual character. Purchased, 1884. 



M. 1639. The hinder portion of the cranium ; from the Upper 

 Eocene of Caylux. This specimen agrees precisely with 

 the smaller crania figured by Filhol in the Ann. Sci. Geol. 

 vol. vii. pi. x. Purchased, 1884. 



M. 1635. Two specimens of the right ramus of the mandible ; from the 

 Upper Eocene of Caylux. One specimen shows the three 

 true molars, the alveoli of three premolars, the alveolus of 

 the canine, and the two incisive alveoli. The other speci- 

 men shows the three true molars and the three premolars. 

 The penultimate premolar is in contact with the two teeth 

 on either side, and is placed in the tooth-row. In this 

 respect the species differs from the R. ferrum-equinum 

 section, and agrees with the B. ccelopTiyllus section 1 ; which 

 is precisely contrary to the condition prevailing in the 

 upper dentition. This is one more of the many instances 

 where the fossil forms do not agree with the subdivisions 

 in which the recent forms are arranged. These specimens 

 agree precisely with an enlarged figure of the mandible, in 

 which the anterior teeth are wanting, given by Filhol 

 in the Ann. Sci. Geol. vol. vii. pi. xi. fig. 4. 



Purchased, 1884. 



M. 1636. Eleven specimens of the mandible, more or less complete ; 

 from the Upper Eocene of Caylux. Purchased, 1884. 



Genus PHYLLORHINA, Leach 2 . 

 Dentition : I. \, C. {, Pm. =&, M. |. 



The genus is confined at the present day to the tropical regions of 

 the Old World and Australia. 



1 Vide Dobson, op. cit. 



2 Syst Cat. Indig. Mauiin. and Birds Brit. Mus. p. 5 (1816). 



