MURIDZ.—ACOMYS. 
188 
Echimys cayennensis. 
The Cayenne Ecutmys. 
Pictet, Mém, de la Soc. de Phys. et d’Hist. Nat. de Genéve, ioe 145. 
amm. 
pls. 1-3, pl. 4 (skeleton), 1841-2.— Waterhouse, Nat. Hist. 
li. p. 834, pl. 16. figs. 6 & 6a (molar teeth). 
*a, Skull. 
Echimys fuliginosus. 
Presented by F. de Castelnau, Esq. 
¥*a, *6. Skulls. Bahia. 
The Wuire-sriveD Ecnimys. Echimys albispinosus. 
Is, Geoff, Guér. Mag. de Zool. 1840, pl. 29. figs. 1-3 (molar teeth) 
The Srrvetzss Ecurmys. Echimys inermis. 
Waterhouse, Nat. Hist. Mamm. ii. pp. 849 & 498, pl. 16. fig. 5. 
From Mr. Bridges’ Collection.—The specimen 
*qa. Skull. Bolivia. 
figured by Mr. Waterhouse. 
b. Skull: young. 
The Srrone-spineD Ecuimys. Echimys hispidus. 
Is. Geoff., Guér. Mag. de Zool. 1840, Mamm. pp. 9, 35 & 54. pl. 29. 
figs. 4, 5, 6 (molar teeth). 
DACTYLOMYS. 
, ; . 1-1, 44 
Teeth :—Incisors — ; Molars 7 ;=20. 
The Tyricat Dacrytomys. Dactylomys typus. 
Guér., Mag. de Zool. 1840, Mamm. PR 29 & 47. pl. 28. figs. 1-8 
(molar teeth).— Waterhouse, Nat. Hist. Mamm. i. p. 311. pl. 16. 
fig. 3 (skull, copied).— Deville, Rev. et Mag. de Zool. iy. p. 853. 
pl. 16. figs. 1,2 (teeth), 1852. 
Echimys dactylinus, F. Cuv., Nouv. Ann, du Mus. i. p. 450. pl. 18 
fig. 3 (teeth), pl. 19. figs. 5, 6 (skull); Dents des Mamm. p, 186 
no. 73 (dentition), 1825. 
Dactylomys, Schred., Séugth. iv. pl. 2389. fig. 10 (dentition). 
ACOMYS. 
Teeth :—Incisors ; Molars = ;=16. 
The Ecyrrran Acomys. Acomys dimidiatus. 
*q, Skull. Egypt. From the Stockholm Museum. 
Acomys mexicanus. 
Brandt, Mém. Acad. St. Pétersh. vii. taf. 5 a. figs. 11, 12 (dentition) 
