110 R. Lydekker—Tertiary Lacertilia and Ophidia. 
In conclusion, I may add that I have carefully examined a very 
extensive series of thin sections of the four types of Carboniferous 
Corals which Mr. Thomson speaks of as ‘the four species of 
Alveolites,” and I have failed to find in a single instance any indica- 
tion of any of the phenomena above mentioned as caused by the 
presence of mural pores. I have therefore no doubt that the 
corallites in these four types possessed imperforate walls; while the 
general structural features which they present render it certain that 
they are truly referable to the genus Chetetes, Fischer. 
TV.—Nortes on Tertiary LacertTILIA AND OPHIDIA. 
By R. Lyprxxer, B.A., F.G.S., ete. 
RECENT examination of the remains of Tertiary Lacertilia 
and Ophidia preserved in the British Museum having brought 
to light some new facts in regard to distribution, and also indicating 
the necessity of revision of certain determinations of other authors, 
I have thought it advisable to communicate the result of my 
observations in a collective form. 
Iguana.—In his description of the vertebrates of the Quercy 
Phosphorites Dr. Filhol’ describes and figures two fragments of the 
jaws of a small Lizard which he refers to the American genus 
Iguana, under the name of Iguana europeana, although in the 
description of the plate? they are mentioned as Proiguana. Among 
the Hastings collection from the Upper Eocene (Oligocene) of 
Hordwell in Hampshire I find several vertebrae (No. 32840, a) of a 
small Lizard, which show the minute zygosphenes characteristic of the 
Iguanas, and agree in all other respects with the vertebrae of existing 
forms. I have, therefore, no hesitation in referring these specimens to 
the Iguanide; and since (as I shall again have occasion to mention) 
at least a certain proportion of the Hordwell and Quercy Squamata 
appear specifically identical, I think it is not impossible that these 
specimens may belong to I. europeana. With regard, however, to 
the reference of this species to the genus Iguana, it will, of course, 
be necessary to use that term in a much wider sense than in recent 
herpetology, where it is restricted to two species; but if the type 
European form be eventually found decidedly different, the name 
Proiguana might be adopted. The occurrence of such an essentially 
American type in the European Tertiary is paralleled by the oc- 
currence in the CGiningen beds of the genus Chelydra among the 
Chelonia; and also of Latonia among the Heaudata, which is closely 
allied to, if not identical with, the Brazilian Ceratophrys. 
Placosaurus.—In his “ Zoologie et Paléontologie Frangaises,” 
2nd ed. p. 260, pl. Ixiv. fig. 2, the late Prof. P. Gervais described 
and figured part of the cranium of a Lizard from the Upper Eocene 
(Lower Oligocene) of Vaucluse under the name of Placosaurus 
rugosus ; of which the most characteristic feature is the presence of an 
armour of sculptured polygonal dermal scutes on the upper surface. 
Many years later the same writer in his “ Zoologie et Paléontologie 
1 Ann. Sci. Géol. vol. viii. p. 267. 2 Op. cit. p. 338. 
