1856.] 221 surfaces exceedingly roughened, especially towards the base, by longitudinally acute and broken ridges. Rout composed of an antero-posterior pair of fangs confluent half their length. Length of largest tooth 2i inches ; length of crown 10 lines, breadth 12J lines. PoLYGONODON, Leidy. 2. PoLYGONODON VETUS, Leidy. Based on a specimen of the crown of a tooth found in the marl (cretaceous) of Burlington Co., by L. T. Germain, Esq. Length three times the breadtli ; transverse section elliptical ; with trenchant borders ; with six planes on one side and seven on the other. Length 1^ inches, breadth J an inch. May it be an incisor of Mososaurus 9 IscHYRHiZA, Leidy. 3. IscHYRHizA MiRA, Leidy. Based upon an imperfect specimen of a remarkable tooth apparently of a fish, obtained by L. T. Germain, Esq., from the cretaceous green sand of Burlington County. Crown of the tooth when perfect, apparently, laterally compressed conical, invested with smooth shining enamel. Fang more robust than the crown, curved pyramidal, quadrate in section, with the base rugged and divided antero-pos-teriorly. Pulp cavity expanded within the fang, closed below, and narrowing towards the crown. Probable length of tooth when entire about 2 inches ; length of fang 10} lines, breadth of its base 8 lines. 4. Sphyr/ena speciosa, Leidy, Founded on a specimen of tlie crown of an anterior tooth obtained by E. Davis, Esq., from the miocene marl of Cumberland County. Posterior border of the crown nearly straight or slightly sigmoid, trenchant border minutely denticulated, sides towards the base striated, apex semi-barbed. Length 4 lines, breadth 2 lines. Edaphodon. 5. Edaphodon mirificus, Leidy. Based on eight specimens of upper and lower maxillary bones, found in the Green Sand of New Jersey. The superior maxillaries are 3f inches long in the median line and 2 inches wide posteriorly ; and they present the matrices of three teeth. The inferior maxillaries are 5.} inches long and 2| inches deep; and besides the matrices of the three large teeth, they present two or three apparent small ones near the apices of the bones, and another small one to the inner side of the largest tooth. I^otes on ike Reptiles in the collection of the Academy of Natural Sciences of Pkilad'a. By Edw. Hallowell, M. D. Fam. GECKOTID^^. Gen. Hemidactylus, Cuvier, Wagler, Gray, Wiegmann. Section Dactyloperes ou a pouce comme tronques (Peropus Wiegmann.) A. H. Dactyloperes a lames sous-digitales entieres. D. & B. Dumeril and Bibron mention but one species belonging to this division, viz., Hemidactylus ouallensis, inhabiting Oualan, Tahiti, Vanicoro and Tongatabou. It differs very materially from the one about to be described. I do not find any species of Hemidactylus inhabiting Jamaica in the Catalogue of Reptiles in the British Museum, by Mr. Gray.
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