OCTODONTIDZ, QA45 
Carterovon sulct¥eng (Lund ‘*), 
Syn. Echi|no|mys sulcidens, Lund ?. 
Hab. 8. America. 
17617. The cranium, wanting the left incisor and the last true 
(Fig.) molars; from a cavern in Minas Geraes, Brazil. This 
specimen, which is the type of the genus, is described and 
figured by Waterhouse in the ‘Natural History of the 
Mammalia,’ vol. ii. p. 352, pl. xvi. fig. 7. 
Claussen Collection. Purchased, 1845. 
17619. Cranium, covered with calcareous incrustation; from a 
cavern in Minas Geraes. 
Claussen Collection. Purchased, 1845. 
17618. Anterior portion of the cranium, with three cheek-teeth 
remaining ; from a cavern in Minas Geraes. 
Claussen Collection. Purchased, 1845. 
17620. The greater portion of the cranium, with five cheek-teeth 
remaining ; from a cavern in Minas Geraes. 
Claussen Collection. Purchased, 1845. 
17621. Two specimens of the left ramus of the mandible; from a 
(Fig.) cavern in Minas Geraes. One of these specimens is 
figured by Waterhouse, op. cit. fig. 7 a. 
Claussen Collection. Purchased, 1845. 
18891. Five rami of the mandible; from a cavern in Minas Geraes. 
Claussen Collection, Purchased, 1845. 
17620 a. Anterior portion of the cranium, with one much-worn 
molar remaining ; from a cavern in Minas Geraes. 
Claussen Collection. Purchased, 1845. 
Genus CTENOMYS, Blainville’. 
Incisors broad. Cheek-teeth rootless, with kidney-shaped crowns ; 
the third true molar above and below small and subcylindrical 
(Alston). . ; 
Ctenomys, sp. l. 
Hab. $8. America. 
40675 a. Several broken rami of the mandible and incisors; from 
the Pleistocene of Buenos Ayres. Four fossil species 
belonging to this genus are recorded by H. Gervais and 
Ameghino from South America. 
Bravard Collection. Purchased, 1854. 
* K. Danske Vid. Selsk. Skr. vol. viii. p. 99 (1841), Echimys. 2 Loc. cit. 
° Bull. Soc. Philom. Paris, 1826, p. 24. 
