532 Mr. O. Thomas on Mammals 
orbital ridges abruptly curved outwards posteriorly, and 
forming distinct postorbital projecting angles; not continued 
across the parietals. Palatal foramina of medium breadth, 
broadest at the anterior third, pointed behind, without ridges 
posteriorly. Posterior palatal opening level with the middle 
of m', more or less rounded, not very widely open. Basi- 
occipital very narrow (suture 3 millim.), parallel-sided. Bulle 
of medium size. 
Dimensions of the type, measured in the flesh :— 
Head and body 225 millim.; tail 55; hind foot, s. u. 46, 
ce. u. 49°5; ear 24. 
Skull: greatest length 55, basilar length 39; greatest 
breadth 26; nasals 21:5 5:2; interorbital breadth 12; palate 
length 18°5; diastema 11°3; palatal foramina 6 x 3:5; length 
of bulle 11; length of upper tooth-series 8-1. 
Type. Oldmale. B.M. no. 1. 11.3.62. Original number 
705. Collected 8th August, 1901. 
The present is the first record of this type of Proechimys 
in Eastern or Southern Brazil, and Mr. Robert is to be 
congratulated on its discovery. It no doubt represents in 
Southern Brazil the Paraguayan P. longicaudatus, Rengger, 
and the Bolivian P. bolivianus. Its cranial characters are 
remarkably uniform throughout the series examined. 
16. Coendou prehensilis, Linn. 
17. Dasyprocta Azare, Licht. 
Day i O. 
As usual there is considerable variation among these 
specimens in the degree of whiteness or yellowness of the 
belly. 
18. Agouti paca, Linn. 
19. Cavia aperea, Erxl. 
Cavia aperea, rx]. Mamm. p. 348 (1777), based on the ‘‘ Aperea ” of 
Marcgrave, Bras. p. 228 (1648). 
(Not the Cavia porcellus or C. aperea of authors in general when refer- 
ring to the ordinary small wild “ Prea” of Brazil, which is C. ru- 
fescens, Lund, K. Dansk. Vid. Selsk. Afhandl. viii. p. 283, 1841.) 
Cavia leucopyga, Brandt, Mem, Ac. Petersb. 1835, p. 436, pl. xvi. 
QS eee 
Somewhat against my will, the study of these specimens 
