98 PEOF. W. K. PAEKER ON THE STRUCTUEE OF 



the top of the jugal {j) ; the hinder spur obliquely overlaps the jugal process of the 

 squamosal. The latter bone [sq) finishes the oval temporal space behind and below, 

 and runs upwards to prop the parietal at its outer angle, the angle binding on the front 

 of the squamosal. Below, the squamosal helps the supratemporal {s.t) to form a swing- 

 ing point to the quadratum [q). 



The supratemporal {s.t) is a smaller bone ; is nowhere subcutaneous ; so it has no bony 

 warts on it like the exposed bones. It is tightly jammed in between the squamosal and 

 the parotic wing (fig. 4, sq, s.t, op). 



The bones of the lower margin are strongly verrucosa at their upper margin ; but the 

 skin of the upper lip thickens lower down, and the bone becomes smootli. The pre- 

 maxillavy is like a short round-headed nail ; in its upper aspect it looks twice the size 

 it does in its lower ; in that aspect, however, it is seen to separate the right and left 

 maxillaries from each other. It is not half so long, relatively, as in tlie Common species 

 (Plate XIX. fig. 3, and Plate XVI. fig. 3, i^x) : there we find it running up between 

 the maxillaries, prefrontals, and nasals; here it only half separates the maxillaries on 

 their upper face, and these bones keep the prefrontals from the mid line. 



The maxillaries {mx) are warty both in front of and behind the nasal aperture [e. n, 

 al.n). They are then notched above, for the small " os unguis " (/), and then narrow 

 steadily as they run buck under the jugal. 



That bone [j) articulates with the lacrymal in front, with the maxillary below, and 

 then ascends to bind over the descending process of the postorbital {jit.o). The jugal 

 forms more than a fourth of the orbital rim ; it is a solid falciform bone, covered outside 

 with a row of bosses that form tlie ornament of the orbital rim; and it has another boss 

 at the end of the maxillary. 



On the whole, the membrane bones of this species are like those of the Common 

 Chameleon ; but there is an additional bone, which brings it nearer to the typical 

 Lacertilian : this is the parasphenoid. 



This bone (fig. 2, ^ja.s) is a small style, confluent behind with the basisphenoid {b.s) ; 

 it is quite similar to what we find in Lizards generally. 



The vomer (y) is notched at both ends, and may have arisen from two centres, as in 

 many Bii'ds ; but the azygous vomer of the young of the Common species suggests for 

 this also a single centre. 



The palatines (fig. 2, ^ja) are very similar to those of the last kind ; they have a 

 narrow ascending, and a wide horizontal region. The former lies over the nasal groove; 

 and the latter encloses it, right and left. 



The pterygoids {pg) and transpalatines [t.^a] are very similar to those of C. vulgaris. 

 The former are still shorter, relatively, and are attached behind to the quadrate by 

 a ligamentous tract. 



The splints of the mandible (fig. 1) are also quite similar to those of the Common 

 kind ; in the figure the splenial [sp) is indicated in this outer view by dotted lines. 



