INSTITUTE OF SCIENCE, PHILADELPHIA. 2$ 



mm. in the greater and 33 mm. in the lesser breadth and 9 mm. in 

 thickness. 



Several of these plates have been previously noticed by me in the 

 Proceedings of the Academy of Natural Sciences of Philadelphia, 1889, p. 

 97, and are referred to a species with the name of Glyptodoii septentrionalis. 

 They probably belong to the same species as the Chlamydotherium Hum- 

 boldtii of South America. 



Other Glyptodon remains from Peace Creek, collected by Mr. T. S. 

 Moorhead, and sent to Mr. Willcox, consist of five dermal plates, which 

 resemble those of Hoplophorus eiiphrachis of Dr. Lund, found with Chlamy- 

 dotherium Hjunboldtii, in the bone caverns of Brazil. In the American 

 Naturalist, 1888, p. 345, Prof Cope described a dermal plate of a Glypto- 

 don from Nueces Co., Texas, which appears to be of the same kind as those 

 under consideration. Prof Cope several years previously reported the exist- 

 ence of a nearly complete carapace of a Glyptodon in the National Museum 

 of Mexico, and another, together with the jaws and teeth, in the Museum of 

 the School of Mines, discovered in the valley of Mexico.* The Texas 

 specimen Prof Cope refers to a species with the name of Glyptodon peta- 

 lifenis, and says it is of the same type as the Glyptodon of Mexico, but is 

 doubtful as to its identity. 



The Florida plates are thick and hexahedral, with rugged borders. The 

 exterior surface presents a nearly circular raised area surrounded with 

 smaller areas divided from each other by radiating grooves. The surfaces 

 of the raised areas are on the same plane, and are closely pitted. The 

 dividing grooves are also pitted, and that enclosing the circular area exhib- 

 its to one side two larger perforations. In the specimen, represented in 

 figure 9, plate IV., the greatest breadth is 44 mm., and the thickness 19 

 mm. A second, rather larger specimen has the same thickness ; a third, 

 about the same size, is not quite so thick, and a smaller specimen is 16 mm. 

 thick. The remaining specimen, represented in figure i, plate VI., is 53 

 mm. in its greatest breadth, and is 15 mm. thick. The areas of its outer 

 surface are less coarsely pitted than in the others. 



Accompanying the foregoing there is a specimen of an ungual phalanx, 

 somewhat water-worn, probably pertaining to the fore foot of a Glyptodon. 

 It is 52 mm. in length along its upper part, and is 28 mm. high and 30 mm. 

 wide at base. The articular surface, somewhat broken, has been about 22 

 mm. wide and 17 mm. high. 



Among the Peace Creek fossils sent by Mr. Moorhead to Mr. Willcox 

 are a number of somewhat enigmatic character, which are nevertheless sup- 

 posed to be dermal bones of Glyptodonts. They bear a general resem- 

 blance to the conical bones of the tail of Glyptodon or Schistopleurum 



•Proc. Amer. Philos. Soc, Phila., 1885, 2. 



