1% Lydekker — Notes on Dinosaurian Remains. 355, 
honour of the late Dr. Fitton, so well known for his labours in con- 
nection with the Lower Cretaceous of England. The ilium of this 
species, so far as its posterior portion is concerned, makes a remark- 
able approach to the type species of the American Camptosaurus, from 
which, however, this form is widely distinguished by the structure 
of the sacrum. 
4, IGUANODON HOLLINGTONIENSIS, 0.sp. 
Specimens from the Wadhurst Clay of Hollington, near Hastings, 
appear to indicate a third species from these deposits which I propose 
to distinguish, at least provisionally, as I. hollingtoniensis. Some of 
these remains I have previously referred in the work cited to JL. 
Dawsoni, while others I have suggested might belong either to that 
species or to immature examples of I. bernissartensis. 
I take as the type the specimens in the British Museum numbered 
R. 11481 together with others belonging to the same individual 
numbered R. 1629, and also certain vertebree numbered R. 16382, 
which are also believed to have belonged to the same individual. 
The femur (R. 1148) agrees approximately in size with that of 
I. Mantelli, but is at once distinguished by its curved shaft and 
pendant inner trochanter, in which respects it resembles the corre- 
sponding bone of Camptosaurus. It is smaller and of different 
contour from another femur, which, from the evidence of the asso- 
ciated ilium, belongs to I. Dawson. The sacral vertebrae (R. 1632) 
are of the type of those (B.M. No. R. 811) I have previously referred 
to the latter species,” having flattened heemal surfaces to the centra, 
which were not anchylosed together. An ilium (No. R. 8116) 
associated with the sacrum and ischia No. R. 811, although very 
imperfect, shows that the preacetabular process was of the thin 
type of I. Fittoni, and therefore different from that of I. Dawsoni, 
while this ilium is decidedly different from that of I. Fitton. 
Finally, the dorsal vertebrze associated with Nos. R. 811 (B. M. No. 
R. 604) and with R. 1148, are smaller and more compressed than 
those of I. Dawsont. 
That the present form is distinct from I. Mantelli is shown by the 
femur; from I. Dawsoni it is distinguished by the size of the femur, 
and of the dorsal vertebra, as well as by the size and contour of 
the ilium which is apparently referable to it. The sacral vertebra, 
No. R. 1632, which is believed to have been associated with the 
type specimen, distinguishes this species from I. Fittoni ; this being 
confirmed by the sacrum No. R. 811, which is now known to have 
been associated with vertebree and an ilium which are clearly not 
referable to I. Dawsoni, and still less to I. Fittoni. 
Iguanodon hollingtoniensis approximates in the structure of its 
femur, ischia, and sacrum to Camptosaurus, but is distinguished by 
the peculiar pollex of Iguanodon, on which account I include it in 
the latter genus. 
I am at present unable to say definitely whether the unnamed 
imperfect skeleton in the British Museum from Hollington numbered 
1 ‘Cat. Rept. etc.,’ op. cit. p. 217. o Ops His a NOR 
