54 ME. E. W. HOOLEY OX THE SKULL A2s T D [Feb. I907, 



keels or prominences. There is a deep and large depression 

 immediately in front of each orbit, and situated on the maxillae. 



The nasals (PI. II, a) apparently just reach the anterior nares. 

 Rapidly expanding to a width of 57 millimetres, they quickly con- 

 tract to 50 mm. from these openings. From here they gradually 

 widen, till they meet the prefrontals and frontal, when they taper 

 into attenuated points. 



The maxillae (PL II, 5), broad and deeply festooned, resemble 

 those ot the recent crocodiles. 



The lachrymals (PI. II, c) are large. On their hinder ex- 

 tremities are two strong ridges, converging forward and divided by 

 a deep groove, forming the anterior boundary of the sockets. 



The prefrontals (PI. II, d) are small. Their outer posterior 

 edges take a share in the orbital rim. 



The frontal (PI. II, e) is quadradiate, a long posterior ray 

 uniting with the parietal, and shorter rays with the postfrontals ; 

 these also bend forward, and form a small section of the orbits. A 

 broad anterior ray meets the prefrontals and nasals. 



The postfrontals (PI. II, /) are stirrup -shaped, the spur 

 meeting the squamosal, and the branches comprising the posterior 

 boundar}'of the orbits, the outer being the longer, reaching the jugals 

 and completely bounding the sockets from the infratemporal fossa. 



The squamosals (PI. II, g) and the parietal (PI. II, li) are 

 near in shape to the similar boues in the Procoelians, but the greater 

 extent of the supratemporal fossae causes them to throw out longer 

 branches. 



The jugals (PI. II, i) complete the orbits. From here to their 

 union with the quadrato-jugal they are long, slender, rod- like bones, 

 with a slight median bend similar to that seen in the Teleosaurs. 



The quadrato-jugals (PI. II, j) are also narrow, and carry on 

 the bar, made by the jugals, to their union with the quadrate. 



The quadrates are not well displayed. The articular end of 

 the right has been destroyed by the sea, and the left is buried in 

 matrix and hidden by other bones. 



The supraoccipitals are covered by the atlas and axis, and 

 by the matrix. 



Portions of the exoccipitals are to be seen, on each side of 

 the foramen magnum. The outer branch of the left is also visible. 

 It resembles the same moiety as in the recent crocodiles, with 

 perhaps a broader ledge for muscle-attachment. 



The occipital condyle (PL III, cZ), compared with the size of 

 the skull, is small, and has no median groove. 



The basioccipital has a very broad longitudinal ridge, from 

 the condyle to the median eustachian tube. 



The contour of the external nares (PL II, Jc) cannot be 

 determined, for the premaxillae have been broken off, excepting a 

 small portion which comprises the termination of the nasal floor, 

 and a fragment of the posterior extremity of both the right and 

 the left. These suggest that they were not subterminal as in 

 Goniojpholis simus, and that the nasals just entered their posterior 



