disk of each scute is not unfrequently surrounded by several deep 

 hair-pits. The specimen No. 3585 in the Museum of the Royal 

 College of Surgeons apparently belongs to this species l . 



Hob. South America (Argentine Republic and Uruguay). 

 M. 3608. Cast of a portion of the dorsal region of the carapace. The 

 original, which is the type, is preserved in the Museum of 

 the Royal College of Surgeons (No. 3606), and was 

 obtained from the Pleistocene near Rio Metanza, 20 miles 

 south of Buenos Ayres, Argentine Republic ; it is now 

 somewhat smaller than the cast. A small portion of the 

 original is figured by Owen in the 'Catalogue of the 

 Fossil Mammalia and Aves in the Museum of the Royal 

 College of Surgeons,' pi. v. figs. 1,2; in the figured portion 

 the rosettes are very indistinctly defined, but they are 

 well marked in a portion which is not figured. 

 Presented by the Council of the Royal College of Surgeons. 



M. 3604. The greater portion of the carapace ; from the Pleistocene of 

 Buenos Ayres. The dorsal scutes agree precisely with 

 those of the preceding specimen ; the rosettes being 

 frequently indistinct, and the central disks often not 

 larger than the peripheral ones. The periphery of the 

 carapace is wanting. This specimen is noticed by Ameghino 

 in the ' Bol. Ac. Nac. Cordova/ vol. v. p. 8, where it is 

 identified with Burmeister's Q. asper. 



Bravard Collection. Purchased, 1854. 



39479. Cast of the nearly complete carapace and caudal sheath. 

 The original was obtained from the Pleistocene of Monte 

 Video, Uruguay, and is preserved in the Museum at Dijon ; 

 it is figured by Nodot in the ' Mem. Ac. Sci. Dijon,' ser. 2, 

 vol. v. pi. i. (1857), under the name of Schistopleurum 

 typum (of which it is the type). The dorsal scutes agree 

 very closely with those of the preceding specimens ; in the 

 periphery the rosettes are always distinct. Both Bur- 

 meister and Ameghino agree in identifying this specimen 

 with the so-called 0. asper of the former writer, of which 

 a specimen is figured in the ' An. Mus. Buenos Aires,' 

 vol. ii. pi. xxxvii. With this carapace and caudal sheath 

 have been mounted casts of the skull and limb-bones 

 of specimens in the Paris Museum, and the cast of a 

 cephalic buckler (No. 37560) in the Museum Collection. 



By exchange, 1865. 

 1 Provisionally referred by Gervais and Ameghino to G. gemmat-iis. 



