&LYPTODONTIP^. 131 



Ml. 3607. The imperfect hinder portion of the carapace ; from the 

 Pleistocene of Euenos Ayres, Argentine Republic. The 

 form of the posterior peripheral scutes indicates that the 

 specimen belongs to Hoplophorus. 



Bravard Collection. Purchased, 1854. 



M. 3619. A small fragment of a carapace, agreeing in the structure 

 of the scutes with the preceding specimen ; from Buenos 

 Ayres. Bravard Collection. Purchased., 1854. 



43243. Fragment of a similar carapace ; from Buenos Ayres. 



Presented hy Senor L. J. Fontana, 1871. 



M. 3620. Fragments of the peripheral region of the carapace belong- 

 ing to the same individual as No. M. 3607. The resem- 

 blance of these scutes to those of H. ornatus confirms the 

 reference of the present form to the same genus. 



Bravard Collection, Purchased, 1854. 



Hoplophorus (?), sp. 6. 



The following specimens, which are provisionally . regarded as 

 belonging to a single species, indicate a form agreeing approxi- 

 mately in size with the preceding, but distinguished by the rugosity 

 of the scutes and the depression of their central disk, which is 

 nearly circular in form. Not unfrequently there is an additional row 

 of peripheral disks between the normal peripheral rows of adjacent 

 scutes. The grooves are much more deeply marked in the posterior 

 than in the anterior scutes. 



Hah. South America (Brazil). 



The following specimens luere obtained from the caverns of Minas 

 Geraes, and belong to the Claussen Collection, purchased, 

 1845. 



M. 3621. Fragment of the dorsal region of the posterior part of the 

 carapace, showing twelve scutes, which are polygonal in 

 form. In one or two places an additional row of 

 peripheral disks may be observed. The thickness of the 

 scutes is 0,011. 



M. 3622. A smaller fragment from the posterior part of the carapace. 



M. 3622 a. A still smaller fragment from the same half of the 

 carapace. 



M. 3623. Small fragment from the anterior half of the carapace, 

 showing two complete scutes. 



k2 



