gate a complete description. Previous statements as to 

 the soft structures within the various canals, and all 

 references to soft parts have been carefully verified, aud in 



I have to express my thanks to Messrs. Hedley and 

 McCulloch who collected the dried skull from which the 

 separate bones were derived, to Mr. G. Lievain to whom 

 I am indebted for material in the flesh, and to Acting 

 Professor S. J. Johnston, whose kindness in placing the 

 specimens and appliances of the Biological Department of 

 the Sydney University at my disposal, has been of inestim- 



The Premaxilla (Os praemaxillare) |Figs. 1, 2, and 3] 



may be described as consisting of three plates, two in the 

 same plane and continuous, the third nearly at right angles 

 to this plane; the former are nasal plate (lamina nasalis) 

 [1] above, and alveolar plate (lamina alvcolaris)[2] below, 

 the third is the palatine plate [3]. At the union of these 

 three the bone is a good deal thickened, so that there is 

 formed on the lateral aspen of the bone a maxillary surface 

 (fades maxillaris)[i] for articulation with that bone, and 

 a sagittal surface {facie* smjittalix) [">] fur articulation in 

 the median sagittal plane with the other premaxillary bone. 

 The upper surface (fades nasalis) [6] of the palatine plate 

 enters into the formation of the nasal cavity, only the 

 anterior portion of the inferior surface of this lamina shares 

 in the formation of the palate (fades palatina) [7], the 

 greater portion being covered by the vomer (fades vomer- 



The Maxilla (Os maxillai-e) | Figs. 1 ami 5| forming the 

 major portion of the boundary of the mouth, and the lateral 

 aspect of the face, consists of an alveolar plate (lamina 

 alvcnlaris) | 1 1. a flattened triangular prefrontal process 



