GLYPTODONTID^. 117 



M. 3614. A left femur, imperfect proximallj', agreeing with 

 the specimen figured by Burmeister in the ' An. Mus. 

 Buenos Aires,' vol. ii. pi. xxxiv. fig. 1, and referred to the 

 present species ; from Buenos Ayres. This specimen is 

 equal in size to the corresponding bone of G. retieulatus 

 (No. 39481), but difiers in the sharp angulation of the 

 border connecting the head with the great trochanter. 

 It apparently indicates a larger individual than the one 

 to which the type carapace belonged, and may be specifi- 

 cally distinct. Mo history. 



M. 3610. Casts of the bones of the left pes and of the distal extremity 



of the left tibia. The originals are said to have been 



obtained in association with the type carapace, and are 



preserved in the Museum of the Eoyal College of Surgeons. 



Presented hy the Council of the Royal College of Surgeons. 



Glyptodon retieulatus, Owen \ 



Syn. Schistopleurum typum, Nodot ^. 

 Glyptodon asper, Burmeister ^. 

 Glyptodon spinicaudus, Burmeister *. 

 Schistopleurum asperum, Burmeister ^. 

 Glyptodon typus, H. Gervais and Ameghino '. 



From a comparison of the type specimen of G. retieulatus with 

 undoubted specimens of G. typus { = G. asper), the writer has no 

 reasonable doubt of the identity of the two '^. 



The species is of large size, and has the carapace of considerable 

 relative width ; the disks of the scutes are very rough, and the 

 intervening grooves wide and deep ; not unfrequently in the dorsal 

 region of the carapace the central disk of each scute is not larger 

 than the peripheral ones, and the rosettes are then very indistinctly 

 defined and the grooves form an irregular network. The central 



1 Cat. Foss. Mamm. Aves Mus. R. Coll. Surg. p. 119 (1845). 



^ Comptes Eendus, vol. xli. p. 336 (1855). 



3 An. Mus. Buenos Aires, vol. i. p. 200 (1864-69). 



* Ibid. p. 75 (1864-69). 



' Descrip. Phys. Argentine Republic, vol. iii. pt. 1, p. 424 (1879). 



^ Mammiferes Fossiles de TAm^rique Meridionale, p. 198 (1880), 



"^ The proposed identification by Ameghino in the Bol. Ac. Nac. Cordova, 

 vol. V. p. 28 (1883), of G. retieulatus, Owen, with Panochthus tuhcrcidatus, 

 Burmeister, and of G. tubercidattis, Owen, with G. ti/pus (Nodot), is quite 

 untenable, see p. 125, 



