1881.} 163 [Cope. 



the proximal portion and the inner half of the condyles with the epi- 

 condyles. The deltoid crest is not very prominent, so that the shaft is 

 rather slender. The external distal marginal crest is thin, and is continued 

 well up on the shaft. The external part of the condyle displays no inter- 

 trochlear ridge. Olecranar and coronoid fossiB well marked. The olecranon 

 is robust and deep, and is truncate posteriorly and below. The head of 

 the radius is a regular transverse stout oval. 



A fragment of the ilium from near the acetabulum displays a prominent 

 "anterior inferior spine." The best preserved tarsus includes calcaneum, 

 astragalus, cuboid, and navicular bones. The tibial face of the astragalus 

 is strongly convex antero-posteriorly and slightly concave transversely. 

 The head is prolonged some distance beyond the distal extremity of the 

 calcaneum, and presents a convex internal border and a concave external 

 one. Its long axis is parallel to that of the tibial portion, but is not in the 

 same axis, owing to its lateral position. The external face of the trochlear 

 portion is vertical, and is interrupted by a deep fossa behind . The internal 

 face is very oblique, and becomes the superior face of the head. The 

 posterior face of the trochlea is groovisd with a wide and shallow groove, 

 which just reaches the superior face, terminating on the external side. 

 The superior ftice is not grooved, but is shallowly concave in transverse 

 section. The head is a transverse oval, and is convex ; it has a small facet 

 for the cuboid on the outer side. 



The heel of the calcaneum is large and expands distally, so as ta be as 

 wide as deep. The convex astragalar facet is very oblique to the long 

 axis of the calcaneum ; the sustentaculum is rather small. Below the 

 latter is a narrow tuberosity looking downwards and forwards. On the 

 external side, close to the cuboid facet, is a depressed crest. The cuboid 

 facet is as deep as wide. The cuboid bone is a little longer than wide 

 proximallj^ and narrows distally. It has a narrow astragaline facet and 

 a deep fossa below proximally. The hook inclosing the groove for the 

 tendon of the flexor muscle is prominent. The navicular is rather small, 

 and has three inferior facets, which diminish in size outwards. It has a 

 strong posterior knob-like process, with a narrow neck. 



When the tarsal bones are in position, and the tibia stands verticaljly on 

 the astralagus, the cuboid bone is turned interiorly. This indicates that this 

 species walked on the outer edge of the hinder foot. 



Broken metapodial bones are slender and straight. The proximal end 

 of a metacarpal does not display the interlocking lateral articulation seen 

 in Protopsalis. Two phalanges are depressed in form. 



Measurements. M. 



^ anteroposterior 0145 



Diameters of a dorsal centrum } vertical 0075 



' transverse 0115 



T^. , r 1 -J •. 1 (anteroposterior 0145 



Diameters of glenoid cavity scapula ' , ^^^^ 



*= •' ^ ^transverse 0090 



PKOC. AMER. PHILOS. SOC. XX. 111. U. PRINTED MARCH 13, 1882. 



