NATURAL SCIENCES OF PHILADELPHIA. 491 



and fourth fingers of nearly equal length ; fourth toe the longest ; margins of 

 fingers and toes serrated, the under surface protected with transverse scales ; 

 soles of feet covered with strongly carinated scales, ending in a spine ; palms 

 covered with very small scales. 



Color. Uniform greenish-olive above, somewhat deeper upon the back, 

 much lighter beneath, with a marked tinge of yellow ; eight dark colored 

 bands upon the tail. 



Dimensions. Length of head 9 lines ; greatest breadth 5 lines ; length oi 

 body 1J inches ; tail 5| inches ; total length 7 inches 9 lines. 



Habitat. Amakarima Island. One specimen. 



Gen. remarks. Lyriocephalus, Otocryptus, Ceratophorus, and Phryno- 

 cephalus are Iguanian Acrodont saurians, with ears concealed beneath the 

 integument ; but Diploderma differs from each of these. Lyriocephalus has 

 the snout surmounted by a rounded protuberance ; the dentition of Oto- 

 cryptus is altogether different, and in Ceratophorus, as its name indicates, the 

 snout is prolonged into a sort of horn. See D. & B. torn. v. p. 433. The 

 head of Phrynocephalus is nearly circular ; the tail is much shorter, and the 

 body is covered all over with minute scales, being quite a different animal in 

 its general appearance. 



Otoceyptis Weig. 



Among the saurians in the Loo-Choo collection is a very small Acrodont 

 Iguanian, no doubt a young animal, which appears to belong to a genus very 

 near if not identical with the Otocryptus of Weigmann. The form of the head, 

 however, is different from that of Otocryptus, as described by Dumeril & 

 Bibron, and the number of molar teeth is less, viz. : eight instead of twelve. 

 The specimen, small as it is, is much mutilated, and otherwise injured, but 

 the following characters can be distinctly made out. 



Gen. char. Head rounded, and high posteriorly, the anterior slope 

 more gradual than the posterior, the front and vertex being nearly on 

 a line ; snout covered with polygonal scales ; supraorbitar ridges dis- 

 tinct ; eyelids covered with carinated scales of nearly equal size ; occiput 

 covered with polygonal scales, partly smooth, partly carinate ; temples 

 covered with carinated scales; eyelids covered with small scales. The in- 

 cisor teeth on each side separate, a conical canine, and eight tricuspid, the 

 first three the smallest, the last two the largest ; the same number in the 

 lower jaw ; ears concealed by the integument ; body covered with scales 

 arranged in transverse rows ; five fingers without serratures, the fourth finger 

 a little the longest, all armed with recurved nails ; tail slender. 



Dimensions. Length of head 4 lines ; of neck and body 6^ lines ; of tail 

 (mutilated) 10 lines ; length of anterior extremities 6 lines ; of posterior 



Habitat. Loo-Choo. One specimen. Caught Nov. 1854, by McKnight. 



Gen. remarks. But one species of Otocryptus is described by Dumeril & 

 Bibron. viz. : 0. b i v i 1 1 a t a Weig. , the habitat of which is unknown. 



GECKOTID.E. 



Lezards Geckotiens, ou Sauriens Ascalabotes D. & B. 



Gen. Hemidacttlus. 



Sect. Dactyloteles D. & B. 



Sub. div. A. Dact.Jissipedes. 



Hemidactylus marjiokatus nob. 



Spec. char. Mental plate pentangular, small ; behind these several series 

 of unequal scales, larger than those upon the throat ; a transverse row of 

 plates immediately behind the mental and first infra-labials ; the two middle 

 much larger than the lateral ones ; eleven supra-labials on each side ; ventral 



I860.] ' 



