120 



From the tertiary deposits near the Rio Matanza, about twenty miles 

 to the south of the city of Buenos Ayres. 



Presented by Sir Woodbine Parish, K. H. 



557- A larger portion of the carapace of the Glyptodon reticulatus, in which 

 the sutures of the component ossicles are obliterated. 



From the tertiary deposits near the Rio Matanza, about twenty miles 

 to the south of the city of Buenos Ayres. 



Presented by Sir Woodbine Parish, K. H. 



558. A fragment of the carapace of a gigantic extinct Armadillo, nearly 



equalling in thickness the preceding specimen, but having the outer 

 surface of the ossicles divided into much more numerous elevations, 

 separated by narrower channels which unite to form a closer net-work : 

 each eminence or tubercle, of which there are between forty and fifty 

 on each ossicle, has a punctate surface ; the species indicated by the cara- 

 pace of the present pattern may be named Glyptodon tuberculatus. 

 From the tertiary deposits in the Pampas of Buenos Ayres, 



Purchased, 



559. A fragment of the carapace of the Glyptodon tuberculatus, in which the 



component ossicles are square- shaped, and, although the sutures are 

 close on the smooth internal surface, yet the tuberculated external sur- 

 faces of the ossicles are divided by deep channels. The size and shape 

 of the tubercles are so similar to those in the foregoing specimen as to 

 lead to the suspicion that the different form of the ossicles may have de- 

 pended on a modification of a particular part of the. carapace. The 

 analogy, however, of the Glyptodon ciavipes, in which species the speci- 

 men No. 541 affords the opportunity of studying the extent of modifi- 

 cation to which the constituent ossicles are subject in the entire carapace, 

 militates strongly against the supposition that the various sculpturing 

 exhibited in Nos. 554, 556 and 558, could have characterised particular 

 parts of the carapace of the same species. 



From the tertiary deposits in the Pampas of Buenos Ayres. 



Purchased. 



