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length than in the present species; behind the last rib-facet it is unu-h con>(ricteil, 

 so that at this point the width is only half that between the ends of the antero- 

 lateral processes. 



In Erylhromachus the sternum is remarkably similar to our sjieeimen, but it is 

 a little longer in proportion to its width, the keel is rather more reduced, and 

 the anterior border is less deeply concave and somewhat longer. 



The dimensions of the sternum associated with the individual skeleton here 

 described are given below, together with those of some other rails for comparison : — 



The coracoid (PI. X., fig. 7) is relatively more slender than that of Ocydrmnus, 

 and the lateral (hyosternal) process is much more prominent ; in the latter point the 

 coracoid of Hypotaenidia is more similar. The length of the coracoid is 25 mm., 

 the width at the hyosternal process 9 mm. 



The blade of the scapula is considerably more slender in proportion to its length 

 than in Ocydromus, but offers no important peculiarities. Its length is 38 mm., 

 the width of the proximal end 7 mm. 



The blender furculum is U-shaped, and resembles that of Hypotaenidia, except 

 that the hypocleidium is much reduced and does not form any downward projection. 

 If straight lines be drawn from the lowest point of the furculuni to the upper 

 extremities of the arms, we find that the angle enclosed between them is about 45". 

 In the case of Hypotaenidia, by the same method, we get an angle of 40', and in 

 Ocydromus one of about 55'. This point is of some interest because these angles 

 give a fair measure of the degree of divergence of the coracoids, which commonly 

 tends to increase as the power of flight decreases, and we therefore see that in this 

 respect, as in the condition of the sternum, Kesolitnnas comes nearly midway between 

 the flying Hypotaenidia and the flightless Ocydromus. 



The slender Iniriierus (PI. X., fig. 9) is almost identical in form with tliat of 

 Ocydromus, but is perhaps a little more curved. 



The radius and id)ui are also like those of Ocydromus, and the metacarpus 

 dift'ers only in the shortness of its fused first metacarpal, and in the somewhat greater 

 width of the interosseous foramen between the second and third; on the outer side 

 of the second, near its distal end, is a deep groove for a tendon which I have not 

 observed in the metacarpus of Ocydromus. 



The principal measurements of the wing-bones are : — 



