Page:Quarterly Journal of the Geological Society of London, vol. 26.djvu/230

 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