MURID.Z,.—ARVIVOLA. 177 
CTENODACTYLUS. 
Teeth :—Incisors = a ; Molars = —;=16. 
The Gunpr. Ctenodactylus massonii. 
Schreb., Stugth. iv. iy 239. fig. 12 (dentition).— Brandt, Mém. Acad. 
St. Pétersb. vii. pl. 8. figs. 1-8 (8. 
Cervical vertebre.. .......... 7 
ND) ORSAL a J.4 aoratea a aac gear 12 
Lumbar ...... 0... eee eee 7 
Saorall scwewiewycisiackoucis wae i ee ee 3 
Caudal’ y xrvisca chars Ge hssenenwre wes 11 or 12 
a. Skull. Mount Matamata. From Mr. Fraser’s Collection. 
6. Skull. From the Zoological Society’s Collection. 
c. Skeleton. Algiers. Purchased of M. Parzudaki. 
ARVICOLA. 
Teeth :—Incisors 1; Molars $3 ;=16. 
The Warer Rat. Arvicola amphibius. 
Cuv., Oss. Foss. v. (teeth).— Owen, Odont. pl. 105. fig. 12 (teeth).— 
Blasius, Faun. Wirb. Deutschl. p. 344, figs. 183-189 (dentition).— 
Brandt, Mém. Acad. St. Pétersbe vii. tab. 3. figs. 1-8 (skull). 
Rat d'eau, Buff., Hist. Nat. vii. p. 348. pl. 43 (skeleton). 
Cervical vertebra .............. 7 
DOrsal! ice nce aniad Caney 13 
ND 001\|0): | eer ee ea 6 
DAEL AL. osiia pote mee ntarateiibes achsa ab ax 3 
Catidal <6 si ccne esky ewe ann 23 
*q, Skull. Altai Mountains. 
b-d. Skulls. 
e, f. Skulls. Stockholm. Presented by Professor Sundevall. 
g. Skull. From the Zoological Society’s Collection. 
h-k. Skulls. 8. Germany. From Dr. A. Giinther’s Collection. 
l. Skull. Italy.—Arvicola terrestris. 
m, Skull. Pyrenees.—Arvicola monticola, De Selys. 
n. Skull.—Arvicola destructor, Savi. 
o. Skeleton. England. From Mr. E. Gerrard’s, Jun., Collection. 
Arvicola savii. 
Blasius, Faun. Wirb. Deutschl. p. 394. figs, 220, 221 (dentition). 
Var. 6. Arvicola incertus, De Selys, Rev. et Mag. de Zool. 1854, vi. 
360. pl. 11. fig. 1 a, 6 (skull and teeth).—Blasius, Faun. With. 
Bentert. p. 50d, fig. 222 (dentition), 1857. 
*q, Skull, Milan. 
