Cope. ] [Jan. 5. 
and suspensorial apparatus. These indicate larger animals than those of 
P. molossus, and probably indicate the most powerful of the Physosto- 
mous fishes, equaling in this respect many of the saurians which were 
their contemporaries. 
The distinguishing features of the species have been already pointed 
out. 
The premaxillary is an obliquely oval bone or subpentagonal; the 
suture with the maxillary is not toothed, and the anterior or free edge is 
smooth, not tubercular as in two specimens of P. molossus. There are 
but two teeth, of which the anterior is immense, and the second little 
more than half its diameter. The mavillary is stout, and supports in 
front four very small teeth, then three very large, of which the median 
is largest. The teeth recommence very small and closely placed in the 
same line; but as the extremity of the maxillary is lost, the number 
cannot be stated. 
The dentary is similar in form to that of P. molossus, but has rather 
more numerous teeth. Counting from the front there are two large, one 
rather small, two larg 
smallest from third to ninth, inclusive. None of the crowns are pre- 
re, and eighteen small and medium following, the 
served, but the alveoli are round or nearly so. The large tooth of the 
premaxillary if proportioned as in P. molossus must have projected M. 
-0755, or three inches above the alveolus ; the fourth mandibular was but 
little smaller. 
Measurements of Jaws. 
M. 
PCM UOMO sich sta oto s veas oe sas retvas fre sUsD 
Depth ee Gees ccs ee cere ee -09 
Depth maxillary at condyle................. ee 408 
Thickness ‘**: just behind condyle.......... Siler y ea eOeD 
Length dentary...633. 0... 20 
Depth se at symphysis 08 
The various portions of cranial bones preserved are much like those of 
P. molossus, but stouter. The hyomandibular is nearly perfect : it is 
thin, but has a convex rib extending to its acuminate extremity at the 
posterior-inferior angle of the metapterygoid and the superior extremity 
of the symplectic. The preoperculum is attached bya thickened grooved 
margin, and is not overlapped by the hyomandibular. It extends in a 
curved form round towards the angle of the inferior quadrate. Three 
elongate bones, closely appressed, I suspect to be part of this bone, with 
interoperculum and superior ceratohyal. The last is rather narrow, 
and with smooth distal articular surfaces, without suture. The superior 
branchihyals are a little like phalanges of Mosasaurus in form, being 
sub-similar and expanded at the ends, and quite alternated. The para- 
sphenoid is similar to that of P. molossus. The position of the hyo- 
mandibular is vertical to the axis of the basioccipital; the superior part 
directed forwards. 
Sor 
