146 



and extends anteriorly from the anterior margin of the cotylus for the qua- 

 drat um. 



Of the vertebras, several are so distorted by pressure as to be uncharac- 

 teristic. Two well-preserved anterior dorsals have transversely oval articular 

 surfaces excavated openly above, for the neural canal. One is from a position 

 anterior to the other ; and these surfaces are less oval, though still transverse. 

 The centra of both are very concave in profile below, and expand both inte- 

 riorly and laterally to the edge of the cup. A deep groove surrounds the 

 base of the posterior face. In the anterior dorsal, the neural arch is preserved. 

 It exhibits an approach to a zygosphen articulation, more marked than in any 

 other Platecarpus, and is hence nearer Sironectes in this respect, as well as in 

 the slender pterygoid. A zygosphen is not separated from the zygapophyses, 

 owing to their connection by a lamina of bone. The notches at the posterior 

 end of the arch for this prominence are marked. The neural spine had a 

 long anterior ala, the base of whicli extends to the summit of the neural arch. 

 It presents a fine striation vertical to Ihe centrum and oblique to the edge 

 of the bone, as is seen in C. propython, Cope. The diapophysis on this ver- 

 tebra looks obliquely upward, and carries a vertical articular surface, which is 

 concave behind. The line of its lower extremity tails the depth of the neural 

 arch below the latter, and of its upper reaches the apex of the canal in front. 

 The more posterior vertebra has, as usual, a broader articular rib-surface, the 

 diapophysis being flattened above and below. The marginal and angular sur- 

 faces are striate-rugose on these and the other vertebra?. One of the free 

 hypapophyses of a cervical is preserved. It has a subtrigonal section, and is 

 longer than wide, and obtuse. Its posterior faces are exceedingly rugose. 



A cervical rib is compressed and short. Head narrow, large, simple; the 

 adjacent sides striate-rugose. Sides with a shallow groove. 



The scapular arch is represented by an entire right scapula and proximal 

 part of right coracoid. The former is broader than in any of the species in 

 which I have seen it, and is flat and thin above. Its anterior extension is 

 greatest below; its posterior above, at the superior angle. The lower poste- 

 rior margin is strongly concave and thickened. The antero-superior margin 

 is a regularly convex arc of more than 180°. The lower portion in front 

 is on a different plane, and is the rudimental acromion. The articular surface 

 is rugose, and the glenoid cavity not less so. 



The proximal portion of the coracoid is Hat. It presents the usual foia- 



