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Show APPENDIX C.- REPTI1IS. 361 IV. PHRYNOSOMA< DOUGLASSII, Gray.-( PL VII, fig. 6- 10.)- Profile sub truncated ( fig. 7). Nostril openings situated at the extremity of the superciliary ridge ( fig. 9).' Occipital'and temporal spines* reduced to blunt, knobs ( fig. 6 and 7). One row only of pyramido- horizontal and abdomino- peripheral scales. Lowor sur-^ face of head ( fig. 8) covered with small and uniform scales. Mar* , ginal series of scales x> f the lower jaip large and conspicuous, flattened, with a sharp horizontal edge. An. inframazillary row likewise conspicuous in their size ( fig. 7, 8, and 9). Scales of the belly smooth, acute posteriorly. Femoral pores very . conspicuous ( fig. 10). The series, from either side, are separated On the middle region of the belly by a free space. The lower surface of body appears as if unicolor, but,, when examined carefully, numerous and crowded dots are seen. V. PHRYKOSOMA PLATYRHINOS, Girard.-( PI. " VTI, fig. 1- 5.) - Snout truncated, flattened, eoncave ( fig. 2). Nostrils situated within the internal margin of the superciliary ridge ( fig. 4). Occipital and temporal spines of middle size ( fig. 1 and 2). One row of pyramido- horizontal and abdominQ- peripheral scales, much smaller than in the preceding species ( compare fig. 1 to 6, on pi. VII). Lower surface, of head covered with small, nearly uniform scales; on both sides, and near the neck, a series appears a little more conspicuous, slightly raised and acute. Inframarginal series of plates, large, of stout appearance, sharp and acute ( fig. 3), above which two rows of small plates are seen lining the margin of the lower jaw ( fig. 4). Scales, of the belly smooth and of middle size. Femoral pores very conspicuous, but more apart than in the preceding species ( fig. 5). A free space is left on the middle region between the right and left series. The lower surface of the body is unicolor. VI. PHRYNOSOMA MODBSTUM, Girard. ( PI. VI, fig. 4- 8.)- Snout truncated, flattened, but not concave ( fig. 6). Nostril! opening within the internal margin of the superciliary ridge ( fig. 7). Occipital and temporal spines of middle development ( fig. 4 and 6). No pyramido- horizontal scales at the periphery of the abdomen. Lower surface of head with minute, generally uniform sdales; a row lining the inframaxillary plates, distinguishing itself by its serial arrangement and its. Slightly increased ^ size ( fig. 5). Row of inframarginal plates resembling that. of Phr* j> latyrhino8y ( fig. 5); above which only one series of smaller plates is observed, lining the margin of the lower jaw ( fig. 6 and 7). Scales of the |