64 PEOPESSOR OWEN ON THE 



The ulna (Pis. XV. & XX. figs. 16 & 17) is 3 inches 1 line in length, of the usual 

 ornithic character, with a well-defined, narrow, elliptic, rough muscular depression, 8 lines 

 in length (fig. 16, c), extending upon the shaft from below the anterior or palmar angle 

 of the proximal articular surface. This bone has no pneumatic foramen ; the orifice for 

 the medullary artery is above the middle of the same palmar surface, the canal inclining 

 distad. The shaft of the bone is nearly straight ; the back or anconal surface, which is 

 slightly convex, shows feeble impressions of the attaching ligaments of the alar plumes, 

 M'hich are represented in all the figures of the entire or living bird. A second ulna is 3 

 inches 3 lines in length. 



There was no carpal or pinion bone in the collection of remains submitted to me : this 

 part of the wing is conjecturally restored in dotted outline in Plate XV. 



§ 8. Bones of the Leg. (Pis. XV., XXL, XXII. & XXIII.). 



Of the five femora in the above defined series of remains of the Dodo, two measure 

 6 inches 3 lines in length; one (PL XXI.) is 6 inches 4^ lines ; the shortest is a little 

 under 6 inches, with proportionate differences in the diameter of the shaft. All of them 

 show a small pneumatic foramen (PI. XXI. figs. 1 & 2,p) on the inner side of the anterior 

 ridge of the great trochanter (ib. c), and on the same transverse line with the head of the 

 bone. This part shows an oblong depression (ib. figs. 2 & 3, a) for the " ligamentum 

 teres" at the upper and back part. The articular surface on the same aspect of the neck 

 (ib. fig. 3, h), adapted to the trochanterian prominence of the pelvis (PI. XIX. t), is 

 well-defined. The trochanter (PI. XXL fig. 1, c) rises, ridge-like, above the level of the 

 head, and is continued from behind the middle of the articular surface on the neck, 

 forward, with a convex outline upon the fore and outer part of the shaft, where it gra- 

 dually subsides ; a narrow intermuscular ridge (ib. fig. 1, r), inclining to the middle of 

 the fore part of the shaft, is continued from the trochanterian one. The small tro- 

 chanter (ib. fig. 3, d) is a small subcircular tuberosity, in some specimens a ridge, 3 to 

 4 lines in length, on the inner side of the shaft, about an inch below the head. The 

 muscular impressions on the fore part of the bone are well defined. A minute medul- 

 lary canal (ib. fig. 3, m) perforates the middle of the back part of the shaft ; the 

 popliteal fossa (ib. fig. 3, o) shows a few small pneumatic orifices ; a triangular rough 

 flat surface divides the fossa from the outer condyle. Above the fibular depression 

 (ib. fig. 3, g) there is a well-defined, slightly raised, rough surface (ib. k) for the head 

 of the ectogastrocnemius muscle. The ridge (ib. n) extending to the back part of the 

 inner condjie is not sharp ; the rotular groove (ib. fig. \,]}) is deep and moderately wide, 

 with the inner boundary, formed by the narrow anterior part of the inner condyle (ib. 

 fig. 5, ^), most produced. The breadth of this end of the longer femora is 1 inch 9 lines ; 

 the character of the distal articular surface is shown hi PI. XXI. fig-. 5. 



The head, neck, and great trochanter (PI. XXIII. fig. 6) are occupied by a pneumatic 

 cancellous structure, with a thin compact wall on the upper part and sides : this begins 



