254 -- RODENTIA. 
Genus DOLICHOTIS, Desmarest’. 
Syn. Cerodon, Cuvier. 
The last upper molar with three lobes. 
Dolichotis, sp. 1. 
Dolichotis minor, H. Gervais and Ameghino?. 
Hab. S. America. 
40675 c. Palatal portion of the cranium, containing all the cheek- 
teeth ; from the Pleistocene of Buenos Ayres. ‘This 
species is considerably smaller than the existing D. pata- 
chonica, and may perhaps belong to D. minor, H. Gervais 
and Ameghino, with which it agrees in the strongly de- 
veloped third lobe of the last upper molar. The length 
of the space occupied by the series of cheek-teeth is 0,0207. . 
Bravard Collection. Purchased, 1854. 
Dolichotis, sp. 2. 
Hab. 8. America. 
40675d. The right ramus of the mandible of a species somewhat 
larger than the last; from the Pleistocene of Buenos 
Ayres. The length of the space occupied by the series of 
cheek-teeth is 0,0225. 
Bravard Collection. Purchased, 1854. 
40675 e, f. Detached teeth and limb-bones, which may belong to 
one or other of the foregoing species; from the Pleistocene 
of Buenos Ayres. Bravard Collection. Purchased, 1854, 
Genus HYDROCHGERUS, Erxl.* (ca Brisson). 
Hyvrocherus cappbara, Erxl.* 
Syn. (?) Hydrocherus affinis capybara, Lund. 
Hab. 8. America. 
18925. Portion of an incisor; from a cavern in Minas Geraes, 
Brazil. This specimen agrees exactly in size with the 
incisor of the living form, with which the so-called H. 
affinis capybara’, Lund, may in all probability be united. _ 
Claussen Collection. Purchased, 1845. 
' Mammalogie, p. 360 (1822). 
2 Mammiféres fossiles de l’ Amérique du Sud, p. 47 (1880). 
° Syst. Regn. Animal. p. 191 (1777). * Op. cit. p. 193. 
5’ Vide 1. Gervais and Ameghino, ‘Mammiféres fossiles de ’ Amérique du 
Sud,’ p. 43 (1880). 

a eee a 
