CROCODILIANS, LIZARDS, AND SNAKES. 223 



sliieUl, nltliough it is not homologous with that so called; but I have liad to depart 

 from this rule iu dealing with tlio genus Liolwmus, in which, owing to the greater 

 development of the parietals and the piesence of a true occipital, that terminology 

 might have led to confusion. 



The habits of the numerous members of this family are as varied as their physiog- 

 nomy. All the forms which we have observed in the Agamoids are repeated here 

 save the parachute-bearing Dragons, which have no pleurodont analogues. On the 

 other hand, sucli types as the Anoles, with their digital expansions, and the semi- 

 marine algivorous Amhhjrhynchns are unrepresented in the acrodont series. How- 

 ever, this apparent parallelism between the Agamoid and Iguanoid series of genera 

 is very superficial, and there is, it appears to uie, not one form so exactly repeated 

 iu both as to deserve to be united into the same genus were the character of the 

 dentition, on which the family distinction i? based, not to be considered. 



The great majority of Iguanoids are iusectivorons; Ljuana, BrachijJopus, Amhly- 

 rlnjnchus, ConoJojihus, ritymatHrus, Sauromahis, Basillscus, and Dijysosaurus are herbi- 

 vorous, and the Ctenosaura are reported to be omnivorous. 



Mr. J. Percy Moore' states that the Liocephalus carinatus of tLe 

 Bahama Islands is carnivorous, '^ not even stopi)iiig at cannibalism,'' 

 while from the stomach of an individual of the same species, also from 

 the Bahamas, I took parts of flowers, with seed vessels and seeds; so 

 that this form also is omnivorous. 



Some species of Sceloporiis and Fhriinosoma are at i)reseut the only Iguanoids 

 known to be ovoviparous. 



With the exception of two genera occurring in Madagascar and one in the Friendly 

 and Fiji islands, the range of this family is restricted to the New World. — (Boulenger. ) 



Systeniatie. — The elements composing the 7uandible may be fused at 

 some points in certain genera, as may be discovered under the heads of 

 the osteology of each. In Anolina' the surangular is either wanting or 

 is fused with the angular. On this ground I proposed at one time to 

 separate this group from the remainder of the Iguanidjii as a distinct 

 family, but the presence of similar variations in some genera of the 

 latter makes it proper to abandon this course. 



There are three distinct subfamilies of this family, which may be dis- 

 tinguished by characters of the skeleton. The first is characterized by 

 the presence of numerous abdominal ribs, which do not connect with 

 the sternum. This is the Anolina' of the present work, and the Gastro- 

 pleura' of Wiegmanu (1834). I have fortified this character by the 

 discovery of the peculiarity of the left pulmonary mesentery, above 

 mentioned. In the two other subfamilies the mesenteric characters are 

 identical. In the Basiliscina^ the proximal extremity of the clavicle is 

 expanded and perforated, as iu the Teiidj^ and other Leptogloss types. 

 In the Iguanime it is simple. These divisions may be tabulated as 

 follows : 



Abdominal ribs; clavicle simple; a left hepatopulmonary mesentery Angling 



No abdominal ribs; clavicle proximally looped; no left hepatopulmonary mesen- 

 tery Hasiliscix.e 



No, or very few, abdominal ribs; clavicle i>roximally simple; no left hepatopulmon- 

 ary mesentery Iguanin.e 



' Proceedings, Academy of Natural Sciences, Philadelphia, 1895, p. 433. 



