388 CRETACEOUS REPTILES. 
number, proportions, and general shape of the teeth, the present species more 
resembles some of the Iguanian tribe. The anterior coronal groove is continued 
to the anterior margin of the crown, which it slightly indents in the larger teeth ; 
but this is the only approach to that complex structure which characterises the 
teeth of the typical Iguanide. Fig. 19 a is a magnified view of the crown of 
one of the anterior teeth ; and fig. 19 a’ of one of the posterior teeth. 
There is no existing species of the Iguanian or other herbivorous family, nor of 
any of the pleurodont Saurians, with which the present chalk-fossil is identical ; 
nor can I refer it to any of the established genera of Lacertia. The absence of 
the cranium and bones of the extremities does not allow of any closer compari- 
son with the Monitors, Iguanas or Scinks ; but the characters of the teeth justify 
the consideration of the fossil as the type of a hitherto undescribed genus and 
species, which I therefore propose to call Coniasaurus crassidens, or the thick- 
toothed Lizard of the Chalk formation. 
The specimens represented in figs. 18, 19 & 20 are from the Clayton chalk- 
pit near Brighton: a smaller portion of a lower jaw and a few teeth have been 
obtained by Mr. Dixon from the Washington chalk-pit near Worthing: and 
vertebre have been found by Mr. Catt in the upper chalk near Falmer, during 
the cutting of the railroad from Brighton to Lewes. These are the only speci- 
mens of the genus and species that have yet been discovered. 
Genus Do.LicHosauRUS. 
Species. Dolichosaurus longicollis. (Tab. XXXVII. figs. 1 & 2; 
Tab. XXXIX. fig. 4.) 
Mr. Dixon has obtained such information relative to the beautiful specimen of 
the mutilated head and anterior thirty-six vertebre of the fossil Lizard from the 
lower chalk of Kent, in the admirable collection of Mrs. Smith of Tunbridge, 
and figured in PI. XXXVI. fig. 1, as leaves no doubt in his mind that it formed 
part of the same skeleton with the chain of posterior abdominal and sacral ver- 
tebre in the collection of Sir P. de M. Grey Egerton, Bart., M.P., F.G.S., 
and which is figured in the ‘ Geological Transactions,’ 2nd Series, vol. vi. pl. 39 ; 
and in the present work at Pl. XXXIX. fig. 4. 
Both specimens are from the same quarry or pit at Burham in Kent, were 
found at the same time, and there is good reason to suppose in the same block 
of chalk. It appears, however, that they were disposed of by the quarrymen to 
