180 Miscellaneous. 



of the neui'al arch is deeply excavated ; in the other it is plaue and 

 marked with a mediau groove. 



Of the remainiug bones it may be obsei-ved that the articular faces 

 were evidently capped by cartilage, and do not present the smooth 

 condyloid character common to so many reptiles. They are, indeed, 

 not so smooth as the dense layer of the shafts and surrounding por- 

 tions, which rises in a fine bounding ridge round the surface formerly 

 capped by the cartilage. The articular end of a bone may be the 

 proximal end of the femur. The section of the shaft resembles that 

 of a T-rail — the lesser expansion representing the base of the tro- 

 chanter, and the greater that of the head. Seen proximally, the 

 head is transverse and truncate, as in the great trochanter of many 

 mammals, while the trochanter is smaller, oval in section, and oblique 

 to the head. There are two articular facets on the head : the 

 larger extends across the inner side ; the smaller is subround, and 

 is directed inwards or towards the trochanter; the two are separated 

 by the ridge of a right angle. 



A supposed distal end of a metapodial bone displays a shallow 

 trochlear face of not much antero-posterior diameter. A phalange 

 is of remarkable form, resembling that of an herbivorous Dinosaur 

 in its short wide proportions. The articular faces are slightly tro- 

 chlear in their character; and the inferior is directed inferiorly at au 

 angle of 45" to the axis of the shaft. The form indicates a digiti- 

 grade terrestrial form. The proximal end of a rib exhibits the sec- 

 tion of the shaft and the head. The latter has a broad, tubercular 

 articular surface, and a smaller capitular surface on the narrow pro- 

 duced head. The section of the shaft is lenticular. 



This genus appears to combine some Dinosaurian characteristics 

 with those in which it resembles the llhynchocephalia. This associa- 

 tion of diverse features is confirmed by those observed in the genus 

 Clepsydrops, Cope, described below. 



Specific characters. — The surface of the sides of the centrum is 

 marked with a few coarse shallow longitudinal grooves, which run 

 into shallow reticulations of weak raised lines. The neurapophysis 

 is sharp-edged in front, and with some ridges externally at the base. 



The edge of the posterior articular face is excavated opi^osite to 

 the chevron-facets. The latter are large, separated by a flat sur- 

 face, and bordered externally by a raised edge from the polished 

 dense layer of the lateral face. 



metre. 



Diameter of centrum, vertical -021 



„ ,, transverse -019 



„ „ longitudinal •Oil 



Width of neural canal •006 



„ of neurapophysis -004 



The superficial layer of the other bones is smooth or striate and 

 rugose near articular extremities. The distal end of the head is 

 oblique, and the side below it concave for a short distance. The 

 very short shaft of the phalange is concave, almost emarginate on 

 one margin. The borders of the tubercular head of the rib are 

 thin and broadly flared outwards at the sides. 



