Part 98

Depth.--Least distance from ventral face of basioccipital, excluding median ridge, to line touching ventralmost points of the two bullae. L to L' on fig. 31.

m1, Length.--Greatest length which rarely or never is alveolar length.

P4.--

Lateral.--Length from posterior margin of tooth to anteriormost part of the protocone (anterolateral cusp).

Medial.--Length from the posterior margin of tooth to anteriormost part of the deuterocone (anterointernal cusp).

M1.--

Breadth.--Distance from medial edge of crown to lateral margin of crown, approximately at a right angle with longitudinal axis of the skull.

Length.--Greatest diameter, anteroposteriorly, of the inner lobe or inner half of the tooth.

Depth of skull at anterior margin of basioccipital.--Measured from anterior end of ventral face of basioccipital, excluding median ridge, vertically to dorsal face of parietal excluding sagittal crest. K to K' on fig. 31.

Depth of skull at posterior borders of Ms1.--Measured from ventral face of palatine bones at posterior edge of upper molars to dorsal face of frontals in plane of postorbital processes of frontals. S to S' on fig. 31.

TABLE OF CRANIAL MEASUREMENTS

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Key:

A Basilar length (of Hensel) B Length of tooth rows C Breadth of rostrum

Catalog Sex and Collection Number age Locality A B C ---------------------------------------------------------------------------------

Mustela frenata average} {45.1 16.6 13.7 maximum} ad. 10 Adirondacks, New York {47.0 17.4 14.6 minimum} {43.2 15.9 13.0

average} {44.7 16.3 13.7 maximum} ad. 10 Massachusetts {47.0 16.8 14.9 minimum} {43.3 15.9 13.1

average} {44.0 16.3 13.2 maximum} ad. 10 Liberty Hill, Connecticut {46.0 17.4 14.4 minimum} {41.5 15.2 12.1

average} {44.4 16.5 13.3 maximum} ad. 10 Beaver Dam, Wisconsin {46.1 17.7 14.1 minimum} {40.6 15.6 12.3

average} {43.0 15.6 13.0 maximum} ad. 10 Washtenaw Co., Michigan {45.4 16.5 13.4 minimum} {39.7 14.7 11.6

average} {37.5 13.4 10.7 maximum} ad. 8 Adirondacks, New York {39.8 14.5 11.2 minimum} {36.4 12.8 9.8

average} {36.5 13.4 10.5 maximum} ad. 5 Massachusetts {38.1 14.0 11.0 minimum} {35.2 13.0 10.0

average} {37.3 13.5 10.8 maximum} ad. 6 Maryland {37.9 14.1 11.2 minimum} {36.8 13.0 10.4

average} {37.2 13.4 10.6 maximum} ad. 5 Beaver Dam, Wisconsin {37.6 13.7 11.3 minimum} {37.0 12.9 10.0

average} {36.5 13.1 10.5 maximum} ad. 9 Washtenaw Co., Michigan {37.5 13.7 11.0 minimum} {35.9 12.8 9.8

Mustela frenata A. N. S. P. 4137 ad. Washington Co., Maine 45.8 16.5 13.3 M. C. Z. 7267 ad. Moose Head Lake, Maine 44.9 16.6 14.5 M. C. Z. 5501 ad. Bucksport, Maine 46.9 17.1 14.4 M. C. Z. 9142 ad. Bucksport, Maine 45.0 16.1 14.0 av 45.7 16.6 14.1

M. C. Z. 9101 sad. Bucksport, Maine 37.7 14.0 11.6 M. C. Z. 9122 sad. Bucksport, Maine 38.2 13.8 11.5

Mustela frenata average} {44.8 16.8 13.5 maximum} ad. 10 Douglas Co., Kansas {46.0 17.8 14.1 minimum} {43.8 16.2 12.9