226 S AITRI A. 



anteriorly to the frontal, laterally to the anterior three inner supra- 

 oculars, and posteriorly to the inner pair of parietals, and anterior 

 occipital ; the latter is pentagonal, posteriorly acute-angled, and con- 

 tiguous to a subrhomboid postoccipital. A pair of latero-occipitals of 

 considerable development is observed, one on each side of the anterior 

 and posterior occipitals, contiguous anteriorly with both parietals, and 

 laterally with the temporal shields. The parietals are subquadrangu- 

 lar, longer than broad, and nearly equal in size ; the inner pair is 

 contiguous by its longest sides to the vertex plate, outer parietal, and 

 latero-occipital ; anteriorly to a portion of the second and third inner 

 • supraoculars, and posteriorly to the anterior occipital ;' the outer 

 pair is limited in front by the inner parietal, sideways by the latero- 

 occipital and first and second inner supraoculars, and posteriorly by 

 the temporal shields. The inner series of supraoculars are large ; 

 the outer series of moderate development. There are no supraciliaries, 

 the outer supraoculars occupying their place. The nasal is surrounded 

 anteriorly by the rostral, superiorly by the first internasal, inferiorly 

 by the first labial, and posteriorly by the postnasal, which is rhomboid. 

 The loral is well developed, somewhat bent, though angular, extend- 

 ing slightly to the upper surface of the head. The rim of the orbit is 

 formed above by the series of outer supraoculars, and below by a 

 series of nine small plates, interrupted beneath the pupil by the fifth 

 labial, which enters into the orbital chain, leaving five infraorbitals 

 behind, and four in front. The posterior five infraorbitals constitute 

 a chain extending from the fifth labial to the posterior inner supraocu- 

 lar, whilst the anterior four extend from the fifth labial to the ante- 

 rior inner supraocular. The anterior infraorbital is much larger than 

 the -rest, and is called by some writers anteorbital ; it truly occupies, 

 with the second plate of the same series, the anterior rim of the orbit. 

 The four anterior upper labials diminish in size posteriorly ; the fourth 

 being smaller than the fifth; the following, three in number, are large, 

 resembling in shape and size the temporal shields. The symphyseal 

 is hemidiscoid, one half smaller than the rostral. There are eight sub- 

 quadrangular lower labials, narrow in front, elongated behind. A series 

 of seven infralabials are here observed between the series just alluded 

 to and the mental shields, properly so called, of which there are four 

 pair and an odd one in front, contiguous to the symphyseal, whilst the 

 others diverge ; the anterior pair alone being contiguous upon the 

 middle line of the chin. 



