Cope.l "ob [March f , 



tending behind the anterior third of the length. Basicranial and basifacial 

 axes in one line, flattened, the supraorbital border flat, concave on the 

 edge ; postorbital processes obtuse, the temporal ridges commencing with 

 thin posterior border, which they excavate. The ridges then turn, ex- 

 tend parallel posteriorly, terminating in the horn -like processes already 

 described, with a slight divergence. The apices mark the posterior third 

 of the length of the skull. The occipital condyle is wider than deep, and 

 its superior border retreats forwards so as to cause its cup to look upwards. 

 The exoccipital diameter at the foramen magnum is less than that of the 

 basicranial axis, the osseous element of which, probably sphenoid, is re- 

 curved on the sides to their middle. The sides of the latter expand a 

 little to meet their lateral alse* Immediately above their contact is situ- 

 ated the supposed condyle for the hyomandibular element. The basicranial 

 axis is convex opposite the postorbital processes, from the bases of which 

 a concavity separates it. It has a slight median groove at this point. It 

 is much narrower than the interorbital width above. A short distance in 

 front of the postorbital processes it begins to contract, and gradually 

 reaches an acuminate apex. Superior to this apex, commencing posterior 

 to it, the space between it and the supraorbital or nasal elements is occu- 

 pied by a massive element (? ethmoid) which forms the floor of the nasal 

 median fontanelle. 



The surfaces are smooth, but readily weather so as to be granular. The 

 granules are subround, with flattened surface. 



Measurements of skull, M. 



Total length of skull to end of frontal bone (No. 1) 180 



" " " muzzle to orbit ; axial 024 



" " " skull to postorbital process 058 



" " " " to apices of frontal cartilage 117 



" " " " to ? pterotic apex (axial) 155 



Width of skull at prefontals 045 



" " " " supraorbital borders 055 



" " " "? pterotic apices. . 088 



" „" occipital condyle '.. .034 



Depth " " " 025 



Measurements of jaws. 

 Length of mandibular ramus from cotylus, inclusive. .145 



Depth ' ' mandibular ramus at cotylus 028 



" middle .-. .035 



Length " palatopterygoid bone from cotylus, inclusive. .145 

 Depth " " '.'at postorbital articula- 

 tion 071 



Depth of palatopterygoid bone at orbit 035 



Length" "•"."*' " posterior to orbit .070 



A second species has been brought to light by the researches of Mr. W. 



