Journal of the Philadelphia Academy. 413 



contracted in the middle, each side ; anterior marginal scuta rery 

 narrow, linear ; occiput with two very large fulvous spots ; supe- 

 rior jaw emarginate, inferior jaw acute; tail rather long, simple.' 

 The length of the shell is three inches and four-fifths; its greatest 

 breadth, two inches and four-fifths; and its breadth in the middle, 

 two inches and two-fifths. 



The other paper by Mr. Say contains '' Descriptions of three 

 new species of Coluber^ inhabiting the United States," 1. C. 

 amcenus; "Above brown or blackish; beneath bright red; tail 

 short, with an abrupt solid conic tip." Inhabits Pennsylvania* 

 Length ten inches and three-tenths ; of the tail one inch and three- 

 fifths. 2. C rigidus: " Dark fuscous or blackish; beneath 

 yellow, with two black fines." Inhabits the Southern States. 

 Length, twenty inches and three-fifths ; of the tail, four inches, 

 3. C septemviltatus : " Brownish, with three blackish lines; 

 beneath yellow, with four blackish lines." Inhabits Pennsylvania. 

 Length, nine inches and two-tenths ; of the tail, two inches and 

 a half. 



In the ^' Description of two species of the Linnean genus La- 

 certOy not before described, and construction of a new genus 

 Cyclura^^^ Dr. Harlan points out the osculant position of these 

 animals between Iguana and Stellio^ and assigns to the subgenus 

 which he has established to receive them, the following characters. 

 ^' Cyclura. Palate deprived of teeth; tongue fleshy and ex- 

 tensible, cleft at the tip; skin of the throat folded transversely; 

 back furnished with a flexible crest or fringe : tail, about half the 

 total length," furnished with numerous elevated spinous rings ; 

 '' scales which form the elevated rings separated by two or more 

 rows of depressed spineless scales above." The species described 

 are both natives of America. 1. C. carinata, '' Crowns of the 

 teeth dentated ; a row of corneous scales lining the infra-orbitar 

 ridge ; dorsal crest wanting between the scapulae, and also over 

 the sacrum ; scales of the body uniform, square, small, slightly 

 imbricate, and spineless : legs and feet furnished with scales, 

 having minute spines pointing downwards: tail carinated above 

 and slightly compressed in the middle ; spiny bands terminating 

 four inches from the extremity, and separated from each other by 



