ELOPIDJE. 
43 
pressed or much expanded at the base, but smooth oj with slight 
longitudinal ribbings, and the slender apex considerably incurved. 
Premaxilla with 13 marginal alveoli; maxilla with about ctG, dentary 
with about 39 alveoli. 
Form. Log. Upper Cretaceous (Xiobrara Group): Kansi s,U.S.A. 
P. 9200. Imperfect crushed cranium, about as broad as long, with 
remains of maxillae and two vertebral centra; Ef.kader, 
Logan Co,, Kansas. PurcliasecL 1900. 
Pachyrhizodus subulidens (Owen). 
[Plate YII. figs. 1, 2.] 
1842. Rapkiosaurus suhulidxm, R. Owen, Rep. Brit. Assoc. 1841, p. 190. 
1850. Rapkiosaurus lucius, R. Owen, in Dixon’s Geol. Sussex, p. 385, 
pi. xxxix. figs. 1-3. 
1851. Rapkiosaurus subulidens, R, Owen, Rept, Cret. Form. (Mon. 
Palaeont. See.), p. 19, pi. x. figs. 5, 6. 
1889. Pachyrhizodus suhulidejis, A. S. Woodward, Ann. Mag. Nat. 
Hist. [6] vol. iv. p. 351. 
Type. Anterior portion of left maxilla ; Woodwardian Museum, 
Cambridge. 
The type species of the so-called lacertilian genus Rapkiosaurus, 
of comparatively small size, the maxilla attaining a length of about 
0-10, and the mandible about O’lo. Teeth very smooth, inwardly 
and backwardly curved. [Premaxilla unknown ;] maxilla flattened 
externally, with a very large anterior process, and spaces for from 
30 to 40 teeth. Dentary bone ver}' deep, but rapidly contracting 
in front into a narrow thickened symphysis ; its outer face remark¬ 
ably smooth, marked with two deep longitudinal depressions between 
which the middle part of the bone projects in a rounded longitudinal 
ridge ; its oral border with spaces for at least 30 teeth. 
Form. Log. Turonian : Cambridgeshire, Kent, and Sussex. 
38566. Imperfect right maxilla and left dentary, associated with 
the metapterygoid and part of the hyomandibular ; Lower 
Chalk, Hailing, Kent. Purchased, 1864. 
P. 1808. Slab of chalk with right maxilla exposed from within 
(PI. YII. fig. 1), associated with clavicle, other fragments, 
and scales; Sussex. The scales are ornamented in their 
exposed sector with a few discontinuous radiating grooves ; 
and one is figured by the present writer in Proc. GeoL 
Assoc, vol. X. pi. i. fig. 8. Egerton Coll. 
