244 E 



If. 



Vertical iliainetor of the scapuhi, IhmIv mily 0. (MO 



Transvorso diaiiiotcr of the 8cai>;ila, liody only 0. 0(i."> 



Wiiltli of the fan-process at the cxtronnty 0. 0(!r> 



Width of tlie shaft of the fim-proccss (depressed) 0. 0-J5 



Length of the spine (apex wanting) 0.7(15 



Width at the haso 0. 0C>7 



Width at the middle 0. 04H 



Thickness at the middle 0. OOri 



III ;i sct'diid specimen (Plate XLYIII, fig. 2), the coracoid ])rocess is 

 pn'seiil, sliowiiig ideniity of character witli tlic scapulii of" tlie I\ chirurgiis. 

 'i'his specimen also presents the anterior scapular hook. The dentation 

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

 specimen. 



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

 tig. 2), there are twenty teeth in 0"\235. From Prof 11 F. j\Iudge's 

 collection. 



Pklecopteru.s chirur^us, 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, A\hich they resemble 

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

 oblicpie component rods than in F. gladius. The basal three inches of the 

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

 that of the P. jjerniciosus. ■ 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 jiuictioii being rather narrow, it is 

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

 rspinc contains fifteen rods in a width of 0™.051. 



Measurements. 



M. 



Vertical wiiUh of the scapular hody in I'miit 0. (i| I 



Width of the chiviclo at the scapula O.irx, 



Length of tlie coracoid inside ('.041 



This, as well as the second specimen, was ll'uiul by Prof B. F. Mudge. 



Pklecopterus cladus, Cope. 

 Distinguished from the preceding species l)y the superior size and mass 



