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. 



