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Show 0 656 APPENDIX C- KftPTILKS. V is in great, measure destitute of that roughness which i » general! j associated with the idea of these reptiles. Th$ abdominal scales are subquadrangular or lofcenge- shaped, either smooth or slightly, keeled, according to the species. On the breast and anterior portion of the shoulders several rows of the largest scales are seen, very prominent, very acute posteriorly, and strongly carinated or keeled. The anterior" and* upper portion of the thigh is likewise provided with large scales-, but much less conspicuously keeled than on the . shoulders. The tail is stout, always depressed at its base: it diminishes very rapidly posterior to theven^, and becomes cylindrical toward its tip. The pyramidal and raised scales are sometimes more conspicuous on its sides and upper surface than on the body itself. The scales below the tail, in the vicinity of the vent, have the general appearance of those of. the belly; in the post- anal groove some larger scales may occasionally % be seen. Here, the scales assume* a subverticillated arrangement. On the conical portion of the tail they are carinated, while they are generally smooth, about, the vent. The anterior and posterior legs are nearly ; of equal size^ the latter, however, are slightly stouter. The toes,, five in number, are neither short nor very long; the first and fifth are the iBhortest and either of equal length, or the fifth niay be a little longer; the second and fourth somewhat longer than the first, and fifth, and likewise either of equal length,, or the fourth somewhat longer than the second; the third is always the longest. v The scales extend all over the toes, overlapping even the base of the nails: they assume a subtriangular shape, with a very acute posterior suminit, and a very distinct carina on their middle. The nails themselves ar£ curved, coiq pressed at the base, and very acute at the tip. On, the inferiof surface of the hind legs, along the thigh, a series of pores is observed,, the femoral peres varying, in number and con-spicuousness according to the species. The anal pores are totally absent in phrynosomas. We are thoroughly acquainted with six species of the genus PhrynoHoma9 viz. Phr. coronatumy Phr. cornutum} Phr.^ dougla$$ ity Phr. mo& estum, Phr., orbiculare, and Phr. platyrhinos. Phr. hwlani is identical with Phr. cqrnutum; Phr. vrieg-manni; with Phr. orbiculare; and Phr. blaihvittei, with Phr. coronatum. After a mature examination of Prof. Holbrook's description of |