70 MR. ST. GEORGE M IV ART ON H EMICENTETES. [Jan. 17, 



rather well developed ; the two hinder upper premolars much more 

 vertically extended than the true molars. Caudal vertebrae nu- 

 merous. 



Hab. South-eastern Asia and Indian archipelago. 



Ptilocercus*, Gray. 



Dentition : I. g, C. ^, P.M. §=f, M. |=§. Skull much nar- 

 rowed behind the postorbital processes ; orbits very nearly encircled 

 by bone ; the anterior margin of each not sharply prominent ; no 

 process above the lachrymal foramen ; temporal fossa large ; posterior 

 margin of palate slightly thickened ; no defects of ossification in 

 palate ; pterygoid fossae distant from palate ; a ridge-like para- 

 mastoid process ; postglenoid process rather large ; malar perfora- 

 tion very small ; foramen rotundum and spheno-orbital fissure repre- 

 sented by a single opening ; uo supraorbital foramen ; infraorbital 

 canal large but very short ; posterior palatine foramen very small ; 

 external cingulum of upper molars not developing distinct cusps ; 

 last upper premolar much more vertically extended than the true 

 molars. Caudal vertebra; numerous. 



Hab. Borneo. 



Hylomys f, Midler and Schlegel. 



Dentition: I. g, C. j=J, P.M. g, M. gj. Skull not much 

 narrowed anteriorly, rather so between the orbits ; only a small 

 postorbital process ; a process above the lachrymal foramen ; no 

 defects of ossification in palate ; pterygoid fossae extending forwards 

 to posterior margin of palate ; malar with a small perforation ; in- 

 fraorbital canal rather large, but not much elongated ; no supra- 

 orbital foramen ; external cingulum of upper molars not developing 

 cusps ; last upper premolar much more vertically extended than the 

 true molars. Caudal vertebrae few in number. 



Hab. Java, Sumatra, and South-eastern Asia. 



Erinacejd^e.. 



I. — , C. jEi, M. |E|. Skull broadest between the posterior 

 roots of the zygomata, which are complete though somewhat 

 slender ; no postorbital process ; a ridge and process in front of 

 orbit ; temporal fossa large ; pterygoid fossae well developed ; a 

 transverse ridge at posterior part of palate, with a narrow transverse 

 plate behind it ; paroccipital and mastoid processes ; nasals separate ; 

 malar imperforate, small, suspended in zygoma ; tympanic a mere 

 ring, not forming a bulla ; a glenoid, but no distinct carotid fora- 



* Gray, Proc. Zool. Soc. 1848, p. 24, and ' Zoology of Voyage of II.M.S. 

 Samarang,' 1850, p. 18, pi. v. ; Wagner, Schreber, Supplem. v. p. 538. 



t Muller and Schlegel, Verbandl. i. p. 50, tab. xxv. figs. 4-7 ; Wagner, 

 Schreber, Supplem. ii. p. 554, & v. p. 530 ; Blvtb, Journal Asiatic Soc. Bengal, 

 1859, p. 293. 



