144 bulletin: museum of comparative zoology. 



first used cyclura as a specific name for what he called L'Iguane de la 

 Caroline. After what Catesby said we imagine that he had a Bahaman 

 specimen which had been carried to Carolina and had probably been 

 sent to Paris from there. Which Bahaman species he had it is impos- 

 sible to decide from his meagre descriptions. So unless the t;y^e is 

 still in existence and sufficiently well preserved, which is improbable, 

 it will not be possible to more than surmise that Cuvier probably 

 had a specimen of C. baeolopha. Stejneger and Barbour have both 

 used the name Cyclura cyclura Cuv. for the Cuban Iguana and this 

 might be considered as restricting the name. It is probably better 

 to drop the name altogether until someone studies this old type, and 

 also the type of nubila in the British Museum. 



, KEY TO THE SPECIES. 



Median frontal shield enlarged and tubercular. 



fei Nasals broadly in contact with the rostral stejnegeri. 



b^ Nasals separated from the rostral by small scales, or granules. 



c^ Posterior prefrontals separated from the frontal shield by two rows of 



scales nigerrima. 



<? Posterior prefrontals separated from the frontal shield by a single row 



of narrow scales cornuta. 



'■ Median frontal shield very slightly enlarged, not tubercular. 

 h^ Nuchal section of dorsal crest formed of spines much longer than those 

 of the back section. 



c^ Prefrontal and frontal scales small and irregular carinata. 



<? Prefrontal and frontal scales enlarged and definitely arranged. 



rfi Nuchal section of dorsal crest formed of 14 spines, some twice as 



wide as the others nuchalis. 



(P Nuchal section of dorsal crest formed of 20 spines, all of about the 



same width rileyi. 



b^ Nuchal section of dorsal crest formed of spines not distinctly larger than 

 those of the back section 

 c^ Scales covering the upper surface of the head flat, depressed, the 

 interstices forming a network; dorsal crest continuous on the 



shoulders collei. 



c^ Scales covering the upper surface of the head, especially the snout, 



swollen; dorsal crest interrupted on the shoulders. 



d^ Inf ralabials separated from the molar scales by a single discontinuous 



row of scales; canthal scale very much larger than the precanthal. 



e^ A single, large, flat median frontal; gular region the same color 



.as ventral surface baelopha. 



