200 



DE. EMBLETON AND ME. ATTHET ON THE 



They belong mainly to the under surface of the cranium, and 

 will be noticed again in the description of that part. 



The nasals lie immediately behind the middle of the premaxil- 

 laries and before the frontals ; they are more expanded in front 

 than behind, contributing to keep up the breadth of the muzzle, 

 and occupying the whole space between the nasal orifices ; they 

 are bounded on their outer sides by the maxillaries, lacrymals, 

 and prefrontals. 



The lacrymals are wedge-shaped and pointed in front, occupy- 

 ing the angles left by the maxillaries and nasals, and are cleft 

 behind, the outer division being larger than the inner, to enclose 

 the anterior angles of the orbital openings. They are bounded 

 by the nasals and prefrontals at their inner, and by the maxil- 

 laries and malars at their outer border. 



The frontals are narrow and elongated, slightly broader behind 

 than before, united in front to the nasals, behind to the parietals, 

 and on their outsides to the prefrontals for three-fourths of their 

 length, and to the postfrontals for the remaining one-fourth. 

 The median suture unites them to each other. 



The prefrontals, elongated and about half as wide as the front- 

 als, become gradually wider from back to front ; they rest upon 

 the postfrontals behind, upon three -fourths of the frontals at 

 their inner sides, and form three-fourths of the inner edges of 

 the orbital openings at their outer side. Just in front of the 

 suture uniting the pre- and postfrontals, at the outer margins of 

 the bones, is a small but distinct prominence, marking the boun- 

 dary, on that side, of the true orbit. In front, the sharply 

 wedge-shaped ends of the prefrontals are received into retreating 

 angles formed by the diverging sides of the nasals and lacrymals. 



The postfrontals are rather more than half the length of the 

 prefrontals, somewhat hatchet- shaped, the handle forwards, and 

 joining the prefrontals; their inner edges are bounded almost 

 equally by the frontals and parietals ; posteriorly they abut upon 

 the squamous bones, and externally, besides joining with the 

 postorbitals, form smooth rounded concave edges, which look 

 outwards and forwards, and constitute a considerable part of the 

 inner border of the true orbit. 



