216 REPORT OF NATIONAL MUSEUM, 1898. 



colon is generally present, and the caBcum is quite conspicuous in 

 Draco, Stellio^ and Agama {aculeata), and less so but present in Lophura, 

 Galotes, Uromastlr, and PhrynoGephalus. 



The mesenteries present the usual sheets, hepatoventral, gastrohep- 

 atic, left gastropulmonary, right hepatic, which includes the right lung. 

 I have noted the following modifications : In Agama colonorum the left 

 gastropulmonary has become a right gastrohepatic by its continuing to 

 the liver, a character observed in Ghamwleon and the Anolinae. There 

 is also in this species a left hepatomarginal. In Megalochilus auritus 

 there is a right hepatoventral, as in Phrynosoma, 



I have had the opportunity of examining the hemipenes of a rela- 

 tively small number of species of this family. As already remarked, 

 the surface is generally calyculate. I liave not found terminal papillae 

 in the genera Uromastix, Agama, Liolepis, Physignathus, or Galotes. 

 The general construction is, that opposite the sulcus spermaticus is a 

 strong longitudinal welt. IS'ear the apex this welt becomes adherent to 

 the side on which the sulcus runs, dividing the organ into two apical 



Fig. 14. 



iGUANIDiE. CROTAPHYTUS WISLIZENII BaIRD AND GlHARD. 



portions. The sulcus bifurcates and i^asses along the base of this par- 

 tition. In Liolepis there are two welts inclosing a smooth space 

 between them. In Galotes oristatellus there is a lesser welt on each 

 side of the ])rincipal one. In all the genera the basal part is smooth 

 and it is sometimes thrown into longitudinal folds. 

 Boulenger makes the following general remarks on the Agamidae : 



The cliief character by Avhich the lizards of this family are at ouce distinguished 

 from their allies is the acrodont dentition. The teeth may usually be divided into 

 three kiud.s, viz, incisors, canines, and molars. The latter iire more or less com- 

 pressed, frequently tricuspid ; regular canine teeth are present, one or two on each 

 Bide, in most of the gener.a; in Uroinastix and Aporoscelis, however, these enlarged 

 teeth are absent, and the anterior lateral teeth wearing out with age, a toothless 

 cutting edge is left between the molars and the incisors, which, in these two genera, 

 unite in the adult to form a large single or divided cutting tooth. 



The skull is less depressed and more strongly ossified than in the preceding fam- 

 ilies, and postorbital and postfronto-squamosal boue arches are well developed; ia 

 Lyriocephalus, as in several Iguanoids, another arch is formed by processes of the 

 pne and postfrontals which unite surrounding a large supraorbital fossa. The pre- 

 maxillary is single, the nasals are double, and the frontal and parietal single; the 

 pterygoids are usually widely separated and constantly toothless; the os trausver- 

 sum is strongly developed; a columella crauii is present. Dermal ossifications on 

 the skull are constantly absent. The fore limbs are well developed, and, except in 



