171 



oblique than in P. ictericus. Tlic coracoid is twice as large, and is ilat and 

 thin. Its inner margin is regularly convex; the posterior concave and thin ; 

 the anterior thickened. The foramen is present. 



The humerus is diflferent in form from that observed in P. crassartus, P. 

 ictericus, Clidnsles, &c. It is relatively less expanded proximally and espe- 

 cially distally; there is but one deltoid crest, which is proximal, and near one 

 extremity of the articular surface, and disappears into the general plane above 

 the middle of the shaft. The general form is flat, partly due to pressure. 

 The distal extremity is but little convex, and displays the terminal muscular 

 insertions but little produced. Near the inferior end, there is an external 

 expansion for articulation with the ulna. 



The radius is lost. The ulna, or a bone which is like that, regarded as 

 such in several species described by me, has the extremities in different planes, 

 which cross each other obliquely. The proximal is triangular and very wide; 

 too wide for the humeri in their present state. It is also too long, leaving but 

 little space for a radius. The distal extremity is as expanded, but much nar- 

 rower, and presents two articular surfaces, a large and wide and a narrow, 

 connected by a wide isthmus. The bone was taken out near a humerus, but 

 not in position. 



The pelvic arch, as above remarked, was found perfect, and with all the 

 elements present, with a femur with the head in relation with the acetabu- 

 lum. The articular extremities are somewhat depressed, and do not precisely 

 fit. The pubis is a straight, flattened bone, dilated moderately at the proximal 

 articular extremity, where it is pierced by a foramen. It is coarsely rugose- 

 striate at both extremities. The ilium is a longer bone than the pubis ; is more 

 slender, and more expanded at the articular extremity, where it is also thick- 

 ened. The shaft is curved so as- to be oblique in position ; it shows no trace 

 of union with a vertebra. 



The ischium is a broader bone, with the axis transverse to that of the 

 body, and sigmoidally curved, iirst slightly forward, then gently backward. 

 The common suture is about as wide as the proximal extremity. The ante- 

 rior margin is somewhat tiiickened ; the posterior is produced into a short 

 process directed backward, which is the homologue of that seen in the Testu- 

 dinata, and which is connected with the distal end by a thin concave margin. 

 The /ew?/7- is rather more slender than the luinierus; the distal extremity 

 is about as much dilated; (he liead less so. The great trochanter is a thick 



