APPENDIX. 193 



This specimen of Baptornis is represented in the cuts given below: 



Figure 37. — Right tarso-metatarsal of Baptornis advenus, Marsh; front view; natural 



Figure 38. — Side view of same bone. 



Figure 39. — Posterior view ; a. lower tarsal bone. 



The principal dimensions of this tarso-metatarsal are as follows :— 



Entire length, 76 



Transverse diameter of proximal end, 17 



Antero-posterior diameter, 8 



Length of second metatarsal, 64 



Length of third metatarsal, 72 



Length of fourth metatarsal, 72 



Antero-posterior diameter of distal articulation of second metatarsal, 8 



Transverse diameter, 5 



Antero-posterior diameter of distal articulation of third metatarsal, 9 



Transverse diameter, 6 



Antero-posterior diameter of distal articulation of fourth metatarsal, 9 



Transverse diameter, 5 



A second specimen of Baptornis advenus (number 1467) appears by a 

 comparison of the corresponding bones in Hesperornis to have been not 

 quite as large as the type specimen, probably about one-fifth less in size. 

 It was evidently a young individual. The femur is less robust than in 

 Hesperornis, but considerably resembled the same bone in that genus. 



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