Nearly akin to the extensive family of _Scincidæ_, there are three small families (as classed by Dr. Gray), the species of which are peculiar to Australia. They have small, undivided, posterior limbs only, or are quite limbless. These families are the _Lialisidæ_, founded on three or more species of a single genus, _Lialis_; the _Aprasiadæ_, founded upon one species only--_Aprasia pulchella_, which is limbless; and the _Pygopodidæ_, comprising the two genera _Pygopus_ and _Delma_, the former containing two, the latter only one ascertained species. The _Gymnopthalmidæ_ constitute still another small family, quadrupedal, but with the limbs small and weak. Of seven genera referred to it, five are Australian, one is European, and one belongs to South America. _Ablepharus pannonicus_ is a small Lizard of this family, inhabiting Eastern Europe, with a congener, _A. bivittatus_, in the Caucasus; and _Gymnopthalmus lineatus_ inhabits Brazil and the Island of Martinique. In the second tribe of _Leptoglossa_, entitled _Cyclosaura_, the scales of the belly are square, in cross bands; those of the back and tail are rhombic and imbricate, or circular and subgranular; the tongue is lengthened, and more or less conspicuously furcate; and the eyes are diurnal, having two valvular lids. The limbs are generally well developed; but in several genera they still are more or less rudimentary, or even absent. There are four small families in which the sides are rounded and covered with scales like the back. Of these, that of _Chamæsauridae_ is founded upon the South African _Lacerta anguina_ of Linnæus, now _Chamæsaura anguina_, which has the limbs quite rudimentary. In the American families of _Cercosauridæ_, _Chirocolidæ_, and _Anadiadæ_, the limbs are moderately developed, and have each five toes. The two last-mentioned families are founded each upon a single species, _Chirocolus imbricatus_ and _Anadia ocellata_; and the other contains the two genera _Circosaura_ and _Lepisoma_--of which the first comprises some two or three species only. All of these reptiles have exceedingly long tails, though not so inordinately long as in the _Lacertidæ_ of the genus _Tachydromus_.