>» Y 
1871.] a [Cope. 
The caudal marginal is strongly concave below, convex above, the 
margin little recurved. The anterior outline is convex medially, with 
straight continuations at right angles to each lateral suture. A portion 
of the edge is broken off. Lateral marginal strongly and openly emar- 
ginate, surface not convex as in the median. Both are massive as in 
Agomphus firmus and allies. The union with the pygal ceases behind 
the costal pit. 
The costals ave thick and considerably curved transversely to the verte- 
bral axis, the rib heads are unusually large and prominent and sub- 
cylindric in section. The rib-ridge is more elevated and rounded in 
section than in any other species. 
The hyposternal is from the left side. It exhibits the free articulation 
for the xiphisternals; the posterior margin is thinned out, while the 
anterior is more abruptly rounded, and without trace of hyosternal 
suture. The external face is distally rayed with narrow ridges. The 
common peduncle of the scapula and procoracoid is short and wide, the 
sutural face for the coracoid, subtriangular. 
The bicipital ridge of the humerus is as usual at right angles to the 
head, and is thin and flat. The plane of the inner crest makes an open 
angle with the outer; its base is less distant from the shaft than that of 
the outer. The great trochanter diverges somewhat from the plane of 
the axis of the head of the femur. The latter overhangs the shaft be- 
hind ; the latter is curved, and beyond the middle subquadrate. In this 
as in the humerus, one of the two crests is continued-as a ridge along the 
shaft. 
Measurements. Me 
Length caudal marginal....... adds cxogsses aa Seeded meee: 0.06 
AAG ares ye ee Re ive sy YS 
ECCS) ok sw Sine oe 6s yt rvent Oa oo 40 itt eee ieee: 0017 
Width: second ?.coshal DONG. 6.0.6 115, «5% vee eS i ee 082 
NTIVIICEMESS GOs th GOMEC ous isk,s an ef - sieitsee teen ot 2 ta 015 
W.idth hyposternal at middle.............. ek ee ona .. .064 
Thickness do. near anterior margin.............. wee os 012 
Length free portion of a rib..... Wee ae sar Br ae siceioe VIRGO 
Diameter (long) head humerus.......... Saye ene ts 037 
ee <¢ shaft Dee ae Ai Nahe 8 6 ie 0 Taso Se teas a 015 
ve * Wad LOMan ss 4s.5 0.5 os its aot uae ee ole 
a EE a PR ee ee ee papi .016 
Width mandible at symphysis at right angles to margin .. .034. 
Thickness mandible at symphysis posteriorly............. .011 
Accompanying the above remains were those of a small chelydrine 
turtle, and of a Taphrosphys, and a portion of the mandible of a species 
allied to Lytoloma augusta and other species. Its size relates well to the 
other bones of the Cataplewra ponderosa, and J suspect that it belongs to 
that species. It has the expanded form with slightly recurved alveolar 
margin, of this group; the masseter fossa is strongly marked ; the dental 
