OCCURRENCE OF LOXOMMA ALLMANNI. 203 



the inner posterior boundaries of the posterior division of the 

 orbits, there being at the junction of the two divisions of the 

 inner orbital boundary a strong angular projection, emphatically 

 marking off the two parts. At this point the interorbital bone 

 is two inches wide. A little further back, at the narrowest 

 part, it is only an inch and three-eighths wide. The inner 

 boundaries of the orbits appear to be formed by the pre- and 

 postfrontals. 



The posterior portion of this central strip reaches from the 

 hinder margin of the orbits to the occiput, the sides being very 

 slightly arched outwards, and continuous with the lateral ex- 

 pansions. This portion of the cranium is two inches and six- 

 eighths wide, and two inches and three-eighths long, measuring 

 from the posterior boundary of the orbit to the point of the 

 epiotic bone, aud, rising a little above the general surface, is 

 strongly denned. The occipital margin is slightly arched in- 

 wards, and at either side is produced backwards into short 

 horns — the posterior points of the epiotic bones. This division 

 of the central strip of bone is composed of the occipitals, the 

 parietals, a portion of the postfrontals, and the epiotics, though 

 here, as in the anterior division, the boundaries cannot be deter- 

 mined with precision. No parietal foramen can be observed. 



The lateral expansions are each three inches wide, and, accord- 

 ing to Prof. Huxley, they are composed of the postorbitals, the 

 malars or jugals, the squamosals, and the quadrates. They pro- 

 ject backwards quite an inch and a half beyond the central por- 

 tion of the skull. The hinder margin of each at first bends 

 outwards and backwards from the side of the epiotic bone for 

 about two-thirds of its extent ; it then suddenly turns a little 

 forwards and terminates in a short point at the lateral or exter- 

 nal angle. From the base of this point the outer or lateral mar- 

 gin advances forwards and outwards, being at first, for about an 

 inch, a little concave ; it then bends a little inwards, and runs 

 forwards in a straight line an inch and five-eighths further to 

 the posterior extremity of the maxilla. From this point, which 

 is only slightly indicated, the lateral walls of the skull are con- 

 tinued in a uniformly inclined line to the anterior extremity. 



