OWEN ON THE GLYPTODON. 257 



walde, are equally unconnected therewith, the latter only bearing 

 comparison with the forms of the Baltic. 



The marshy grounds and extensive cultivated lands at river 

 mouths near the ocean are therefore not entirely, and perhaps not 

 even principally, B&pov rov irorafiov (a river gift). 



W. J. H. 



II. Account of various portions of the Glyptodon, an extinct 

 Quadruped, allied to the Armadillo, and recently obtained from 

 the tertiary deposits in the neighbourhood of Buenos Ayres. 



[Extracted by permission from the last, volume of the Descriptive Catalogue 

 of the Museum of the Royal College of Surgeons in London.] 



Several portions, including the nearly entire skeleton of the hind 

 foot of a singular edentate animal, were described by Professor 

 Owen in a paper printed in the sixth volume of the " Transactions 

 of the Geological Society " (p. 88. et seq.), and were referred by 

 him to a new genus, called Glyptodon. Since the publication of 

 this memoir the complete carapace of the animal has been obtained, 

 and more lately a number of other remains, referred to three other 

 species of the same genus from which the whole anatomy of this 

 animal has been determined. The account given in the present 

 article is taken, with scarcely any alteration, from a detailed 

 description of such specimens of the Glyptodon as are now in the 

 possession of the Royal College of Surgeons, recently published 

 in the descriptive catalogue of the Museum of that institution by 

 Professor Owen. 



The specimens in the Museum of the College consist of the 

 cranium, the carapace, the tail, and the bones of the hind leg and 

 foot of the Glyptodon clavipes, and of some fragments of the cara- 

 pace of three other species. 



At least three species are also known by specimens now in the 

 British Museum, one or two of which are identical with the species 

 here described. The species described by Professor Owen are 

 named respectively, Glyptodon clavipes, G. tuberadatus, G. or- 

 natus, and G. reticulatus. 



Ed. 



1. Glyptodon clavipes. 



1. The cranium. The occipital condyle presents a convexity 

 in the vertical direction, which describes more than a semicircle, 

 and is slightly convex transversely, but is narrower in that direc- 

 tion than it is in the Mylodon : it is directed in the Glyptodon 

 backwards and obliquely outwards. The occipital foramen is very 

 large and transversely elliptical ; its plane is inclined from below 



