SYNOPSIS OP THE VERTEBRATE FADNA OF THE PUERCO SERIES. 315 



proxiraally and externally, and incloses a considerable trochanteric fossa. The head 

 has a large fossa lor the round ligament which is near the neck, from which it is sep- 

 arated by a low boi-der. The little trochanter is quite prominent, and is reverted, but 

 it is not connected with the great trochanter by a ridge. The thii-d trochanter is 

 well developed, and has a wide external surface, whose anterior edge is recurved for- 

 wards. Its upper portion overlaps the line of the infeiior edge of the little trochanter, 

 being higher up than in Pachyania. The middle of the shaft is somewhat depi'essed, 

 and its margins are rounded. 



The proximal part of the left tibia, and the distal part of the right, give the char- 

 acters of that element. The proximal part is laterally crushed. It is evident, how- 

 ever, that the crest is large and obtuse at the apex, and that the spines are low ridges. 

 The e.xterno-posterior border forms a roughened lidge for 35 mm. below the intei-nal 

 femoral surfiice. and ceases rather abruptly below. At or near the middle the 

 shaft is normally somewhat compressed, and slender. The malleolus is very promi- 

 nent, and terminates in an apex in its internal plane. The astragalar surface is l)ut 

 little o])lique; the libular articular surface is large. 



One of the metatarsals shows that the foot was short, since it is neither the lirst 

 nor the fifth. Its proximal face is concave in the transverse direction, but nearly 

 sti'aight anteroposterioi'ly. The arc of the phalangeal face is less than half a circle, 

 and is slightly concave in transverse section. It is divided medially at its inferior 

 foui'th by a short, narrow, and low trochlear keel. Inferior border of phalangeal face 

 Ijrominent and o])enly emarginate. An ungual phalange is preserved, but whether 

 of the anterioi- oi' posterior foot I do not know. Its apex is lost. It is strongly 

 compressed, and has a narrowly rounded supei-ioi" border. The phalangeal 

 cotylus is deeply excavated, and is rather narrow, and has a weak median 

 keel. The superior ])rocess ovei-hangs the phalangeal surface rathei* further than the 

 inferior. The tuberosity for the llexor tendon is a longitudinal oval, Avith sui'face 

 transversely convex, which gradually ascends to the narrow but flat inferior surface 

 ol" what lemains of the phalange. The large nutritive foramen enters above its 

 middle. 



Measurements of Posterior Limb. M. 



I.cugtli of f'omur preserved 123 



Widtli at liead 0(!1 



Length pro.ximad of little trochanter, inclusive 004 



" third " " 085 



^. f nnteroposlcrii)r 010 



Diameters .shaft of femur \ 



I transverse 029 



^. . , ( anteroposterior 023 



Diameters shaft of iibia •( 



transverse 010 



