248 APPENDIX. — REPTILES. 



lower edge of orbit ; in other specimens it may prove to be 

 separated into two. Two temporal shields in contact with both 

 oculars, and about six smaller ones behind ; nine upper labials, 

 the fourth and fifth coming into the orbit. Scales very slightly 

 keeled, in seventeen rows ; the keels only conspicuous on the pos- 

 terior part of body. Upper parts dusky blackish ash, some scales 

 with irregularly scattered, white, very small specks ; each scale 

 of the two outer rows with a large round whitish spot, forming a 

 band, which is not continued on the tail ; belly whitish, the ven- 

 tral plates with blackish outer edges. Three of the hinder max- 

 illary teeth rather larger than the anterior ones, all being nearly 

 equidistant one from the other. Length of cleft of mouth §" ; 

 length of tail 4f ; total length 22". 



Page 70. Tropidonotus trianguligerus. 



g. Adult. East Indies. From the Collection of the Zoological 

 Society. 



Page 76. Tropidonotus fasciatus, Var. B. 



(, ('. Young : not good state. America. Presented by the Col- 

 lege of Surgeons. 



Page 77. 



Tropidonotus pogonias, Dum. & Bibr., is to be considered as 

 a variety, not of T. fasciatus, but of T. cyclopion. The principal 

 character of T. cyclopion is the great number of longitudinal 

 rows of scales : not all the specimens have the orbit enclosed by 

 a continuous chain of small shields. To this species belong the 

 specimens q, t and i, referred to T. fasciatus, p. 77- 



Therefore the text is to be changed, as follows : — 



18. Tropidonotus cyclopion. 



Scales in twenty-seven or twenty-nine rows; upper labials 

 eight, the fourth only touching the eye, but sometimes smaller 

 scales between orbit and labial shields. Three series of qua- 

 drangular black spots, the dorsal of which alternate with the 

 lateral ones. 



a. Half-grown. Louisiana. 



b. Half-grown. New Orleans. From Mr. Cuming's Collection. 



Var. A. Tropidonotus cyclopion, Dum. $• Bibr. p. 57fi. 

 Orbit enclosed by a continuous chain of small shields. Lead- 

 coloured, obscurely black-spotted. 



c Adult. New Orleans. From Mr. Cuming's Collection. 



