248 RODENTIA. 
Hystrix, sp. 
‘ Hab. Ttaly. 
29692. The right upper premolar ; from the Upper Pliocene of the 
Val d’Arno, Italy. This specimen is smaller than H. refossa 
(No. 34959), and the folds of the enamel are apparently 
simpler. Presented by the Earl of Enniskillen, 1855. 
29692 a. Terminal portion of an incisor; from the Upper Pliocene 
of the Val d’Arno. Lgerton Collection. Purchased, 1882. 
Fiystrix sivalensis, Lydekker’. 
This species is founded on the evidence of a fragment of the man- 
dible, from the Siwaliks of the Punjab, India, figured in the accom- 
panying woodcut (fig. 32), and is described by the writer in the 
Fig, 32. 

pm. 4, Toei m. 3. 
Hystriz sivalensis—Fragment of the right ramus of the mandible; from the 
Siwaliks of the Punjab. +. Indian Museum, Calcutta. (From the 
‘ Palzontologia Indica.’) 
‘Palzontologia Indica,’ ser. 10, vol. iii. p. 109; the characteristic 
point of the specimen being the short crowns of the cheek-teeth. 
Hab. India. 
15923. The greater portion of the cranium and mandible of a young 
(fig.) Porcupine; from the Pliocene of the Siwalik Hills, India. 
This specimen, of which the cranium is figured in the 
accompanying woodcut (fig. 33), has been described and 
figured by the present writer in the ‘ Paleontologia 
Indica,’ ser. 10, vol. iii. pp. 110,111, and provisionally 
referred to the present species. The cranium has suffered - 
considerably from crush, and has lost the nasals and a 
part of the maxilla. In the upper jaw there are only two 
teeth, and but three in the lower; thus showing that the 
1 Rec. Geol. Sury. Ind. vol. xi. p. 100 (1878). 

