244 E 



}T". 



Vertical diameter of the scapula, body ouly 0. 040 



Transverse diameter of the scapula, body ouly 0.0(55 



Width of the fan-process at the extremity 0. 065 



Width of the shaft of the fan-process (depressed) 0. 025 



Length of the spine (apes wanting) ■. 0.705 



Width at the base 0.007 



Width at the middle - 0.048 



Thickness at the middle 0. 008 



♦ 



Iii a second specimen (Plate XLVIII, fig. 2), the coracoid process is 

 present, showing identity of character with the scapula of the P. chirurgus. 

 This specimen also presents the anterior scapular hook. The dentation 

 of the cutting-margin appears nearer the base in this than the preceding 

 specimen. 



In a third, which includes only the distal part of the spine (Plate LII, 

 fig. 2), there are twenty teeth in m .235. From Prof. B. F. Mudge's 

 collection. 



Pelecopteeus chieuegus, Cope. 



Represented by the basal part of a large spine attached to the scapula 

 (Plate XLVIII, fig. 1), and by an isolated scapula (Plate LIV, fig. 8). These 

 bones are more massive than those of the last species, which they resemble 

 in various points. The most prominent of these is the wider and less 

 oblique component rods than in P. gladius. The basal three inches of the 

 anterior edge ouly is preserved, and this shows no trace of the undulation of 

 that of the P. perniciosus. The enamel-deposit covers a width of three rods. 



The scapula is, in this instance, attached to the clavicle, to a ledge on 

 the inner posterior face of the latter, which joins the upper edge of the 

 outer side or base of the former. This junction being rather narrow, it is 

 strengthened by the solidly-coossified coracoid on the inner side of it. The 

 spine contains fifteen rods in a width of m .051. 



Measurements. 



M. 



Vertical width of the scapular body in front 0.044 



Width of the clavicle at the scapula 0. 035 



Length of the coracoid inside 0. 041 



This, as well as the second specimen, was found by Prof. B. F. Mudge. 



Pelecopteeus gladius, Cope. 

 Distinguished from the preceding species by the superior size and mass 



