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Show 70 MR. ST. GEORCIE MIVART ON HEMICENTETES. [Jan. 17, rather well developed ; the two hinder upper premolars much more vertically extended than the true molars. Caudal vertebrae numerous. Hab. South-eastern Asia and Indian archipelago. PTILOCERCUS*, Gray. Dentition : I. g, C. g, P.M. g, M. g. Skull much narrowed 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 perforation very small ; foramen rotundum and spheno-orbital fissure represented by a single opening ; no 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 vertebrae numerous. Hab. Borneo. HYLOMYS f, Miiller and Schlegel. Dentition: 1.1=|, C. \z\, P.M. g, M. §=§. 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 ; infraorbital canal rather large, but not much elongated; no supraorbital 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. ERINACEIDA. I- -, C. ~> M. ^. 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 H M S Samarang,' 1850, p. 18, pl. v. ; Wagner, Schreber, Supplem. v. p. o28 t Midler and Schlegel, Verhandl. i. p. 50, tab. xxv. figs 4-^7 • Wagner Schreber, Supplem. ii. p. 554, & v. p. 530; Blyth, Journal Asiatic So'c. Beno-ah 1 oOV, p. -.-'•_>. |