[23] "A Naturalist's Sojourn in Jamaica," by P. H. Gosse. Thus far we have treated of chiefly arboreal _Iguanidæ_; and although a Marine Lizard (_Trachycephalus cristatus_) cannot well be so designated, it nevertheless belongs to the same particular series. We have next a long series of mainly terrene genera of the same great American family, in which the body is subtrigonal or depressed. As many as twenty-two genera, with sixty-one species of the terrene _Iguanidæ_, were catalogued by Dr. Gray in 1845, and a good many have since been added. There is a corresponding series in the kindred Old World family of _Agancidæ_, and in neither instance are the majority of them ground-frequenting Lizards to any great extent. Thus, of Dr. Gray's first genus _Tropidolipis_ (so named from its large keeled scales), and of which as many as nine species are given from Mexico, a tenth (_T. undulatus_, of the United States) is described by Professor Holbrook to inhabit chiefly the pine-forests, where it is often found under the bark of decaying trees; it also commonly chooses old fences for its basking-place. "It is exceedingly rapid in its motions, climbing with great facility to the tops of trees, and is hence not taken alive without great trouble. Its food consists of insects, especially such as are found under decaying wood." The colouring of this Lizard is remarkably brown, with narrow zigzag black bands above, and green below, with a white medium stripe bordered with black; throat and breast black, with a broad green band across. Various species of kindred genera were collected by Mr. Darwin, and are figured in the "Zoology of H.M.S. _Beagle_," and of one of these (probably _Lecolænus Darwinii_), which he observed at Bahia Blanca, in Northern Patagonia, he remarks that "it lives on the bare sand near the sea-coast, and from its mottled colour, the brownish scales being speckled with white, yellowish red, and dirty blue, can hardly be distinguished from the surrounding surface. When frightened it attempts to avoid discovery by feigning death, with outstretched legs, depressed body, and closed eyes: if further molested, it buries itself with great quickness in the loose sand. This Lizard, from its flattened body and short legs, cannot run quickly." With others these Lizards constitute the sub-family _Tropidolepinæ_ of Dr. Gray, which are followed by the sub-family _Phrynosominæ_, in which some very singular Lizards find their place. The most extraordinary of them constitute the genus _Phrynosoma_, four species of which inhabit Western North America. These have great spines to the occiput, in these respects resembling the African genus _Cordylus_ (p. 107), and very Toad-like proportions, looking somewhat like Toads with short tails; and again they decidedly approximate in appearance to the curious _Moloch horridus_ of Western Australia, which belongs to the corresponding Old World family of _Agancidæ_; and, like that strange reptile, they are