190 MURIDZ.—-HYSTRIX. 
PETROMYS. 
Teeth :—Incisors = ; Molars = ;=20. 
The Rock Movsz. Petromys typicus. 
A, Smith, 8. African Quart. Journ. i. p. 146; Tllustr. Zool. 8. Africa, 
Mamm. pl. 21. fig. 1 a-e (skull).— Waterhouse, Nat. Hist. Mamm. ii. 
p. 309. pl. 16. fig. 8 (skull).—Schreb., Sdugth. iv. pl. 289. fig. 11 
(dentition). 
Cervical vertebra.............. 7 
Dorsal: Gace. ice Gao ewes 12 
Dumbat sabia Ps dwn acne 7 
SACRA! ga iiic tke ceed 9 Rake GES 4 
Caudal ......... a ....., 20 (imperfect). 
a, Skull. 8S. Africa. From the South African Museum. 
b. Skull. 
c. Skeleton. §. Africa. Presented by Sir A. Smith. 
HYSTRIX. 
Teeth :—Incisors =; Molars 4;=20. 
re? 
The Porcupine. Hystrix cuvieri. 
Schreb., Saugth. iv. p. 599. pl. 166 (skull), 1792.—F. Cuv., Mém. du 
Mus. ix. pp. 424, 430. tab. 20 (skull).— Brandt, Mém. del’Acad. de 
St. Pétersb. 1835, ae tab. 8. figs. 1 & 2 (skull).— Van der Hoeven, 
Acad. Exp. tab. 19. figs. 1-4 (skull and dentition).— Waterhouse, 
Nat. Hist. Mamm. ii. p. 448. pl. 20. fig. 1 (skull).— Owen, Odont. 
fig. 1 (dentition).— Cuv., Oss. Foss. v. p. 19. pl. 1. fig. 9.—Spiz, 
Cephalog. pls. 7-11.—Pander und D' Alton, Vergl. Osteol. pl. 1 
(skeleton), pl. 8. fig. d (skull), 1823.—Blainv., Ostéog. G. Hystrix, 
pl. 1 (skeleton, 3), pl. 2 (skulls). 
Cervical vertebre.......... cee, a 
Dorsal: 3 owknvl avon nsaudaacd eae 14 
Lumbar an accerhanenueews 5 
MS QOTA oie hx eesdeuanceuaeiak Suh Beas acaaen ch 4 
Cada son 3sc ils kw ak Seka 11 
a. Skull. From the Zoological Society’s CollectionThe specimen 
described by Dr. Gray in Proc. Zool. Soc. 1847. 
*b. Skull, and bones of the body. Gambia. Presented by the 
Earl of Derby.—The specimen described by Mr. Waterhouse in 
Nat. Hist. Mamm. ii. pl. 20. figs. 1 & 2. 
e. Skull. Tunis. From Mr, Fraser’s Collection. 
d. Skull. Portugal. 
*e, Skeleton: very much diseased. | From the Zoological Society’s 
f. Skeleton. Collection. 
g. Skeleton. 
