222 REPORT OF NATIONAL MUSEUM, 1898. 



C. No median weltj lateral welts irom sulcus. 



Scelo2)oru8. 



D. A median, no lateral welts ; calyculate. 



a. Not bifurcate ; welt wide. 



EnyaUoides (calyces coarse). 

 aa. Bifurcate; welt loug and narrow. 



Anolis (calyces minute). 



E. No welts. 



ex. Deeply bifurcate ; calyces confined to branches. 



Microlophus, Uraniscodon, Doryphonis. 

 acx. Shortly bifurcate; calyces extending proximad of branclies. 



Basiltscus. 

 II. No calyces or welts. 



a. Bifurcate ; surface coarsely wrinkled. 



Folyclirus. 



In the genera Gtenosaura, Cyclura, Igucma, Sauromalus, and Enyali- 

 oides {laticeps) the organ is entire ; in the others it is bilobate or bifurcate. 

 Boulenger makes the following observations on this family : 



The lizards of this family resemble very closely, in external as well as internal 

 characters, those of the preceding, or Agamida', from which they are distinguished 

 by the pleurodont dentition. The distinct heterodontism, so frequent in the latter 

 family, is exhibited to a slight degree by one genus only ( Uraniscodon) ; in all others 

 the teeth are subequal in size, and if, as is usually the case, the lateral ones differ 

 from the front ones, the change is gradual. In all genera, save Amblyrhynchus, Cono- 

 lophus, and riiymaiurus, the anterior teeth are conical; the lateral ones are also some- 

 times simply conical or with obtuse crowns, but more frequently compressed and 

 tricuspid; in Iguana and Cyclura cornuta the crowns are finely denticulated on the 

 edge. In the above-named highly remarkable Amhlyrhynchus, Conolophus, and Fhy- 

 maturus all the teeth are deeply trilobate or flower-de-luce shaped. The shafts of the 

 teeth are constantly long and cylindrical and hollowed out at the base. Pterygoid 

 teeth are present in many species; I have not employed this character for the dis- 

 tinction of genera unless accompanied by others. Chamwleolis is one of the few 

 lizards in which teeth are inserted on the j)alatiuo bone. 



The skull docs not differ in any important point from that of the Agamida-. How- 

 ever, dermal cranial ossifications, as, for instance, the horn-like tubercles of Fhry- 

 nosoma, may be present. A supraorbital arch, such as has been noticed in the 

 Agamoid genus Lyriocephalus, Corythophanes, and I'hrynosoma. The clavicle is slen- 

 der proximally, except in the genera liasilisciis and Lamanctus. The interclavicle 

 is T- or anchor-shaped, except in I'hrynosoma, in which the longitudinal limit is 

 absent. The sternum is frequently perforated by a fontanelle. A more or less com- 

 plete system of ossified or tendinous abdominal ribs is developed in many genera, in 

 some {Anolis, Polychrus, Liosaurns, etc.) to the same extent as in the Geckonidas. 



The tongue is thick and villose, entirely fixed to the floor of the mouth, or slightly 

 free anteriorlj-, and not, or but feebly, nicked. The pupil of the eye is round and 

 the eyelids well developed. The tympanum is distinct, except in Jlolbrookia. 



Femoral pores exist in all North American genera, and are alisent in the great 

 majority of the South American. In some of the latter the males have a series of 

 pores on the anterior border of the vent. When femoral pores are present in North 

 American genera they are pierced in an undivided scale. 



The scaling of the head and body varies extremely, and gular appendages, crests, 

 and other ornaments are not infrequent. The upper head scales are usually small, 

 but in some genera assume a shield-like disposition. An enlarged scale is usually 

 present, representing the interparietal of other lizards, and through fusion with 

 adjacent scales sometimes acquires a remarkably large size. Following the example 

 of previous authors, and for convenience, I have used the term "occipital" for this 



