1915 J Shufeldt, Remains of Hesperomis. 291 



H. regalis No. 1207, but as it is one of a set of casts we would like 

 to have it returned when you are through with it." 



Reproductions of my photographs of this cast, together with 

 those of the vertebra here being considered, are exhibited on 

 Plate XVIII. 



The following is Dr. Lull's paper in full : 



"It is evidently the last dorsal vertebra, the 23d, hence was 

 compared with the equivalent bone of three specimens of Hesper- 

 omis regalis, the mounted specimen, Cat. No. 1206, and Hesper- 

 omis Nos. 1477 and 1499. Also with the second mounted specimen, 

 Lestornis crassipes, holotype, Cat. No. 1474. 



"The new bone has suffered from fracture and abrasion, by 

 which certain of the fractured surfaces, e. g., stumps of the trans- 

 verse processes, are smoothed over and rendered deceptive. 



"It is smaller than any of the four equivalent bones, though 

 there is as much range among them as between the least of them 

 and the new bone. 



"It differs from the other three but resembles No. 1477 in the 

 manner in which the neural spine arises, in that the forward margin 

 as preserved has a slight backward instead of a forward inclination. 

 The new specimen differs from all four but resembles No. 1499 

 most closely, in that the lateral walls of the centrum are not so 

 deeply excavated. In No. 1499 this depression is slight, but more 

 marked than in the new specimen, and its greatest depth lies 

 further to the rear. There is a decided ridge leading from the 

 postzygapophysis to the base of the transverse process in three of 

 the vertebra 3 . This is obsolete in the new bone and also in 1499. 



"The anterior articular face seems to be less deeply excavated 

 in the new specimen than in any of the four at Yale. This differ- 

 ence, however, may be more apparent than real, as the lateral 

 limitations of this face are chipped and worn away. A very slight 

 h?emal spine is represented by a broken area in all five vertebra 3 . 

 Herein there is essential agreement. 



"Vertebra No. 1499, Hespcrornis sp., comes the nearest to the 

 new bone in size and general appearance, differing therefrom in 

 being proportionately somewhat longer; this difference is, however, 

 heightened by the broken character of the new specimen. A 

 further distinction lies in the fact that, whereas in the new specimen 



