Maxillary teeth anterior to fangs 10-14 (mean, 12.1; N = 20);
tooth-socket number 6.5-8.5 (mean, 7.2; N = 20) directly opposite distal
tip of suborbital process; lateral anterior foramina 1-3 (mean, 1.8; N =
20); tooth number 6-9 (mean, 6.9; N = 12) directly below center of
posterior foramen (if only two foramina present). Three specimens lack a
diastema and 17 specimens have a diastema. The anterior and posterior
edges of the suborbital process are parallel in two specimens and not
parallel in 14; the process is broken in four specimens. The lengths
(anterior to posterior) of the lateral anterior foramina (if only two
are present) are approximately equal in six specimens, and in six the
anteriormost one is the longest; six specimens have one foramen and two
specimens have three foramina. All specimens examined have two fangs,
with the posterior edge of the lateral flange forming an obtuse angle.
[Illustration: FIG. 4. Lateral view of right maxilla of _T. gracilis_
(KU 83484), x 39. Actual length of bone is 2.44 mm. A. Detail of bone.
B. Outline sketch of bone to illustrate characteristics examined.
Lateral anterior foramina (LF); fangs (F); "prediastemal" maxillary
teeth (MT); lateral flange (PLF); perpendicular lines, A-B and C-D, are
used to determine which tooth-socket occurs directly below the center of
the posterior foramen (the specimen illustrated is atypical because
there are three foramina present).]