Arvicola Gulielmi.
Lower jaw— in.
Length extreme, not including incisor 0.84
Depth, coronoid process to lower edge 0.38
Depth at M 2 0.12
„ at PM 4 0.22
Diastema 0.23
Molar series 0.29
Length. Width.
PM 4 0.14 0.06
M l 0.80 0.06
M 2 0.60 0.05
Arvicola ratticeps.
Upper jaw —
Length. Width.
Diastema 0.32
Molar series 0.28
PM 4 Oil 0.6
M 1 0.10 0.5
M 2 0.70 0.4
Lower jaw —
Length. Width.
Condyle to anterior border of incisor 0.65
Lower edge of angle to symphysis 0.43
Depth of coronoid process to lower edge 0.30
Depth at M 2 0.08
Diastema 0.48
Molar series 0.24
PM 4 0.12 0.05
M 1 006 005
M2 005 004
Lemmus torquatus (var.)
Upper jaw —
Length. Width.
Diastema 0.37
Molar series 0.29
PM 4 0.12 0.07
M 1 0.09 0.06
M 2 0.09 0.06
Lemmus norvegicus (var.).
Lower jaw —
Length. Width.
Length, extreme 0.70
Angle to symphysis 0.51
Diastema 0.22
Molar series 0.27
PM 4 , 0.13+ 0.07
M l 0.08+ 0.06
M 2 0.08+ 0.06
