. Athlon : essays on palaeontology in honour of Loris Shano Russell. Paleontology. 258 Ischyromys and Titanotheriomys and 5b, bu; Table 2). This seems to mark the area of origin for a facial muscle, probably the pars maxillaris anterior of M. buccinator ( Klingener, pers. comm.; see Meinertz, 1943, p. 372, fig. 20, for a similar condition in Marmota, in which the masseter clearly has nothing to do with this area). In Titanotheriomys, there is a fossa, similar to but larger than that in Ischyromys described above, medial and anterior to the fossa for the M. masseter superficialis and just l
. Athlon : essays on palaeontology in honour of Loris Shano Russell. Paleontology. 258 Ischyromys and Titanotheriomys and 5b, bu; Table 2). This seems to mark the area of origin for a facial muscle, probably the pars maxillaris anterior of M. buccinator ( Klingener, pers. comm.; see Meinertz, 1943, p. 372, fig. 20, for a similar condition in Marmota, in which the masseter clearly has nothing to do with this area). In Titanotheriomys, there is a fossa, similar to but larger than that in Ischyromys described above, medial and anterior to the fossa for the M. masseter superficialis and just lateral to the posterior end of the diastemal ridge (Fig. 3c, bu). This fossa varies within the genus (and apparently, within populations), sometimes being large or extremely large and deeply excavated into the side of the snout, facing, in essence, laterally (Table 3). In the latter case, the diastemal ridge forms a prominent shelf ventral to this fossa (Fig. 6a, b, bu).. Fig. 6a-b Titanotheriomys veterior. a. Oblique view of the right side of the palate and zygomatic arch, amnh f:am 79316, x 3. From 15 feet (= 5 m) above 285-foot level. Bates Hole, Wyoming. b. Lateral view of right side of snout, amnh 42993, x 3. From 295-foot level, Bates Hole, Wyoming. Abbreviations as in Fig. 2; bnl — fossa for M. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Churcher, C. S. , 1928-; Russell, Loris Shano, 1904-; Royal Ontario Museum. Toronto : ROM
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