For incisors [Thomas] (1921:141) is followed: opisthodont, orthodont and proodont depending on the angle between the exposed part of incisors and the ventral surface of the rostrum.
The capital letters P and M designate premolars and molars, respectively, of the upper jaws; lower case letters p and m designate corresponding teeth in the lower jaws.
Measurements.—Measurements of skins were used only when provided by the collector. The length of the hind-foot is intended to be always cum unguis, but in a few instances it is impossible to be sure whether the collector included the nail. Length of tail was used only when the tail seemed not to be mutilated. Ear measurements taken by collectors are scarce. In spite of the apparent usefulness of length of ear, it was found to be inadvisable to take the measurement on the dry skins.
The following measurements of the skull are used in the tables:
Greatest length: From the anteriormost part of the nasals to the posteriormost part of the supraoccipital.
Condylo-incisive length: From the anterior face of one incisor, at the alveolus, to the posteriormost part of the exoccipital condyle of the same side.
Zygomatic breadth: Maximum distance across zygomata in a plane perpendicular to longitudinal axis of the skull.
Length of nasals: Maximum length of one or both, whichever is the greater.
Interorbital constriction: Least width between the orbits on top of the skull.
Palatilar length: From the posterior face of an incisor, at the alveolus, to the nearest part of the posterior edge of the palatine bone.