102 The American GeolOQ is/ . September, 1S93 
.s'. x'erinus sp. n. Major. 
Represented by the mandible . Grive St. Alban. 
M. 2 & 3 
There appears to be very little difference between this species 
and the preceding one. 
MYOXID^E. 
Myoxus sansaniensis Lartet.* 
Folding quite complex, and teeth rooted. A badly preserved 
mandible with . Grive St. Alban. 
I. 1 M. 1 & 3 
MURIDiE. 
This family comprises the largest rodents. 
Mas orthodon Hensel.f 
Represented by maxilla and mandible with nearly complete 
dentition, the molars having transverse ridges. Mont St. Gio- 
vanni, Sardinia. 
Cricetodon minor Lartet.* 
Represented by maxilla and mandible with nearly complete 
dentition, the first tooth having two pairs of tubercles. Grive 
St. Alban. 
C. medium Lart.* 
Slightly larger than minor. Represented by beautifully 
preserved specimens of maxilla and mandible. Grive St. 
Alban. 
('. rhoda iiicn m Dep.J 
Somewhat larger than C. medium. Beautifully preserved 
maxilla and mandible. Grive St. Alban. 
Arvicola ambiguus Pomel.8 
This species is somewhat larger than the existing species, 
I. 1 31. 3 
J . amphibius. Represented by maxilla and mandible 
I. I M. 3 
I. 1 M. 3 
and cranium with dentition . Molars rootless. Mont 
St. Giovanni, Sardinia. 
*Notice sur la Colline de Sansan, 1851, p. 'JO et seq. 
fZeits. deutsch. geol. Ges., 1856, p. 660. 
JArch. Mus. Lyon, vol. iv. 
t?Cat. Methodique, 1853, p. 27. 
