CHIROCESTTKIDj®. 
93 
1875. Portheus molossus, E. I). Cope, Vert. Oret. Form. West (Rep. 
U.S. Geol. Surv. Territ. vol. ii.), pp. 184, 194, fig. 8 (woodc.), 
pis. xxxix. xli. ; pi. xliv. figs. 5, 10, 1 1 ; pi. xlv. figs. 9-11. 
1892. Portheux moloxsus, A. R. Crook, Palscontogr. vol. xxxix. p. 1 14, 
pi. xviii. 
1898. X iplmtinus audax, A. Stewart, Kansas Univ. Quart. [A] vol. vii. 
p. 119, pis. vii.-x. 
Type. Skull, with vertebrae and fin-rays. 
The type species, of large size, the cranium attaining a length of 
0-35. Premaxilla with two teeth, the foremost usually having 
two thirds the diameter of the second. Maxilla throe times as long 
as the premaxilla, much deepened at the anterior palatine articu- 
lation, and its oral border nearly straight ; about five enlarged 
teeth in its anterior half. Depth of dentary at the symphysis 
nearly equalling 'one third the total length of the mandibular ramus, 
and its oral border very slightly undulating * about five enlarged 
teeth in front, the two foremost, separated by a transverse groove 
from the three behind. Dental crowns smooth and not facetted, 
not curved at the apex. Cheek-plates marked with very feeble 
large tubercles and rug®. 
Form. <$f Loc. Upper Cretaceous (Niobrara Group) : Smoky Hill, 
Kansas, U.S.A. 
I*. 6326. Slab of friable chalk exhibiting a noarly complete head, 
right lateral aspect, associated with numerous vertebral 
centra, remains of the pectoral and pelvic arches, some of 
the pectoral fin-rays, and the greater part of the pelvic 
fins. The two halves of the pelvic arch are shown to be 
firmly united by suture, and one of the pelvic fins seems 
to be better preserved than any hitherto described. Tt 
exhibits five broad rays, all very finely subdivided and 
articulated in step-like sutures at their expanded distal 
end. The foremost ray is much the largest ; the three 
diminishing hinder rny r s are crushed so as to exhibit their 
loosely apposed right and left halves. Purchased , 1891. 
6327. Series of caudal vertebra;. Purchased, 1891. 
The following specimens from the English Chalk indicate a form 
°f Portheus as largo as P. molossus, probably' distinct, but not 
specifically determinable : — 
25923 x. Portion of cranium ; Chalk, Sussex. Dixon Coll. 
^057. Remains probably of maxilla and prcmaxilla ; Chalk, Lewes. 
Mantell Coll r 
