1889.] NATURAL SCIENCES OF PHILADELPHIA. 97 



H. ingenuum. H. plieatile. 



Length of pastern laterally 57 mm. 50 mm. 



Transverse width of proximal extremity 24 " 34 " 



distal " 19 " 28 " 



shaft, at middle 15 " 25 " 



The specimens of greatest interest in the Peace Creek collection 

 are three osseous plates, attributable to a species of the wonderful 

 giant armadillo, Glyptodon. The plates though possessing the usual 

 breadth, do not present the great proportionate thickness common 

 in the South American Glyptodons. They bear a near resemblance 

 to those of Hoplophorus ornatus, as represented by Dr. Burmeister 

 in the Annals of the Public Museum of Buenos Ayres, 1870-74, pi. 

 xvii, fig. 3. Two of the plates are hexagonal, the other pentagonal, 

 and their thickness is from a fifth to a fourth of their breadth. The 

 outer surface presents a low discoid eminence reaching to within a 

 couple of lines of the border, feebly depressed concentrically and 

 with a slight eccentric elliptical prominence. It is pitted ; more 

 coarsely at the depressed borders, and more thickly and coarsely in 

 the pentagonal than in the hexagonal plates. The inner surface is 

 concave and even ; the borders are tubercular. 



The largest hexagonal plate is 26 lines in its widest and 18 lines 

 in its shortest diameter, and is from 4 to 5 lines thick. The pen- 

 tagonal plate is 22 lines where widest and from 3 to oh lines thick. 

 The species represented by the plates may be distinguished as the 

 Glyptodon septentrionalis. 



Among the fragments of turtle shells is the nuchal plate of a 

 carapace remarkable for its deeply sculptured character, greatly ex- 

 ceeding in this respect the condition observed in any of our recent 

 ones. The areas of the different scutes impressing the plate are 

 traversed by deep valleys and correspondingly prominent ridges. 

 The median length of the plate is 27 lines ; its transverse breadth 

 33 lines. The specimen may be considered as distinctive of a spe- 

 cies with the name of Emys euglypha. 



April 30. 



Mr. Isaac C. Martindale in the chair. 



Eighteen members present. 



Messrs. Charles E. Redinauer and W. B. Van^Lennep, M. D., 

 were elected members. 



Max Furbringer, of Jena, was elected a correspondent. 



The following were ordered to be printed : — 



