506 S A U R I A. 



Syn. — Heteronota, Gray, Catal. Lizz. Brit. Mas. 1845, 174. ; 



Observ. — This genus is closely allied to Cyrtodactyhis, from which 

 it differs by the presence of keeled scales on the abdomen and around 

 the tail. The great development of the sjmphyseal plate was con- 

 sidered as its chief feature by John Edward Gray, by whom it was 

 instituted. 



Heteronota pelagica, Grd. 



(Plate XXIV, figs. 25-32.) 



Char. spec. — Narihus lateralihus, suiter commissuram inter scutum ros- 

 tralem et primiim lahialem sitis. Scutis internasalihus duobus, quad- 

 Tcmgularihus et contiguis; scuto postnasali minimo, tuhercidi/ormi. 

 SciUis mentalibus duobus, parvis. Taberculls doraualibus in duode- 

 viginti sej^ies longitudinales ordiiiatis. Supra fusca, nigro rnaculata; 

 infra unicolori. 



Spec. Char. — Nostrils lateral, situated above the commissure between 

 the rostral plate and the first labial. One pair of quadrangular inter- 

 nasals, contiguous, and a small, tubercular postnasal. One pair 

 of small mental shields. Eighteen longitudinal series of tubercles. 

 Brown, maculated above with black ; beneath unicolor. 



Syn. — Heteronota pelagica, Grd. in Proc. Acad. Nat. Sci. Philad. November, 1857. 



Descr. — The head is depressed, subovoid when viewed from above; 

 the neck is contracted, and the body depressed also, broader than deep. 

 The tail is elongated, subcylindrical, tapering into a point, and nearly 

 as long as the body and head together. The rostral plate is subquad- 

 rangular, slightly longer than deep, subconcave upon the middle of its 

 upper edge ; the nostrils are situated in a little depression, immedi- 

 ately behind its upper angle, contiguous beneath to the commissure of 

 the first labial ; above, it is limited first, by a pair of subquadrangular 

 internasal plates, which are contiguous upon the middle line of the 

 rostrum, and secondly by a quite small, tubercular postnasal, which 

 is contiguous to the internasal. There are ten upper labials, longer 



