BATRACHOSOMA CORONATUM. , 401 



t 



Phrynosoma blaineillei, GRAT, in Beechey, Voy. to the Pacif. Zaol. 1839, 96. PI. 

 xxix, fig. 1 (young) ; &, Catal. Lit. Brit. Mus. 1845, 228. 

 JBatrackqsoma coronatum, FITZ. Syst. Kept. I, 1843, 79. 

 Phrynosoma solan's, GRAY (Brit. Mua.), Catal. Lii. Brit. Mus. 1845, 229. 



DESCR. The general proportions of the body are rather elongated. 

 The head is depressed, the vertex somewhat inclined forwards, and 

 the occipital and temporal spines leaning backwards. The nostrils, 

 being situated upon the anterior extremity of the supraciliary ridge, 

 are lateral. The snout is declivous. The cephalic plates are polygo- 

 nal, moderate, nodulous, or reticulated; those of the temporal region 

 are the most conspicuous, and more distinctly keeled. The temporal 

 spines are stout, three in number, and preceded anteriorly by two 

 strongly developed plates, the rudiments of two other spines, and 

 which reach the very margin of the upper jaw. The occipital spines 

 are slightly curved, reclining towards the neck. There are six sub- 

 maxillar plates, increasing slightly in size from the foremost to the 

 fifth ; the sixth being equal to the fourth. The labial plates are very 

 small ; and the inframaxillar area rather narrow. Besides, there 

 exists a large triangular plate at the infero-posterior angle of the 

 mouth, with its apex directed horizontally outwards. Although the 

 submaxillar plates do not extend as far back as the angle of the 

 mouth, yet the series of these plates is continued by three small scales 

 or plates situated immediately beneath the triangular plate at the 

 infero-posterior angle of the mouth, leading to a subconical scale-like 

 plate placed obliquely behind the latter. Upon the middle region of 

 the. chin we observe four pairs of longitudinal series of scales larger 

 than the rest, the outer series being the largest, and acuminated. 

 Several folds of the skin may be seen under the neck, as well as on its 

 side, upon the edge of which some large pyramidal scales are observed. 



The upper series of pyramidal scales, at the periphery of the abdo- 

 men, extends from the shoulder to the groin, being much more conspi- 

 cuous than the lower series, which occupies the middle region of the 

 abdomen only. The abdominal scales are more of a quadrangular 

 shape than rhomboid ; those on the pectoral region being but very 

 slightly larger than the rest, and all of them smooth or keelless. 

 The femoral pores are rather apart; thirteen or fourteen, on either 

 side, approximating somewhat upon the interfemoral region, though 

 far from constituting a continuous series. The scales on the preanal 



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