1871.] 47 [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 Jateral 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 are 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 pedunele 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, M. 
henge. GA dal, MAGIA, unas cress nets ac wnenate ac 0.06 
Wad thieacn cui tina see an ee Mees aatras Scie sae 08 
"PICK CSS trots (g co2e5, eiligin s a-amuaiins ques a Suaurin es ooe BRE way aes 0017 
Width second ? costal bone. ... 2... 2. cece e ee cece eens *.082 
Thickness do. at centre... 00... cece ences 013 
Width hyposternal at middle..... 0.0... 6... e eee eee ee eee 064 
Thickness do. near anterior margin............ 60... eee 012 
Length free portion of ATID... 6... cece eee eee eee ee 018 
Diameter (long) head humerus. ....... 66... eee 037 
ue “shalt G8 ss acted ea aha TS Hite IER 8 ease 015 
ne HE NEAT LEMUR a sai4 dosnad eave tees CER oS 088 
a Hee SWAG: oe Gaeta Shee e nantes Gupenlelees 016 
Width mandible at symphysis at right angles to margin.. .084 
Thickness mandible at symphysis posteriorly............. O11 
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 aud other species. Its size relates well to the 
other bones of the Cataplewra ponderosa, and I 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 
