. Bulletin. Science; Natural history; Natural history. Fig. 5. Heliscomys sp. (A) and Simimys landeri new species (B-G). Heliscomys sp. A, RM1, LACM 131452. Simimys landeri. B, Holotype, RM', LACM 131062. C, RM2, LACM 130759. D, RM3, LACM 131458. E, RM,, LACM 130771. F, RM2, LACM 130765. G, LM3, LACM 130767. All occlusal views; A-F reversed. Scale = 1 mm. cingulum is a thin crest separated from the paracone and the protocone by a shallower valley than the median transverse valley, and is continuous with the lingual cingulum. The posterior cingulum is moderately developed with a very small inci
. Bulletin. Science; Natural history; Natural history. Fig. 5. Heliscomys sp. (A) and Simimys landeri new species (B-G). Heliscomys sp. A, RM1, LACM 131452. Simimys landeri. B, Holotype, RM', LACM 131062. C, RM2, LACM 130759. D, RM3, LACM 131458. E, RM,, LACM 130771. F, RM2, LACM 130765. G, LM3, LACM 130767. All occlusal views; A-F reversed. Scale = 1 mm. cingulum is a thin crest separated from the paracone and the protocone by a shallower valley than the median transverse valley, and is continuous with the lingual cingulum. The posterior cingulum is moderately developed with a very small incipient cusp in the center of the cingulum, and it is separated from the metacone and the hypocone by a shallower valley than the median transverse valley. Discussion. — The upper molars from Simi Valley are assigned to Heliscomys because of the presence of six cusps that are positioned in two transverse rows of three cusps each, the square shape of the occlusal surface, and the conical shape of the primary cusps, which are separated by distinct valleys. The Heliscomys teeth from Simi Valley are very similar to those of H. sp., cf. H. vetus Cope (1873) from the Pipestone Springs Local Fauna (Black 1965) of the Renova Formation in Montana (Chadronian age) and the Pilgrim Creek Local. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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