. Description of fourteen new species and one new genus of North American mammals. Mammals North America. Oct., A NBW GENUS—PHENACOMYS. 31 upper molar with an anterior pyriform transverse loop, one external and one internal closed triangle, and a posterior trefoil (pi. iy, fig. 12a). Sometimes the outer loop of the trefoil is closed, giving the tooth two external closed triangles and a postero-internal loop (pi. iy, fig. 11a). • Lower molar series.—Line of infolding of enamel near outer side of tooth row. First lower molar with a posterior transverse loop, four greatly elongated interna
. Description of fourteen new species and one new genus of North American mammals. Mammals North America. Oct., A NBW GENUS—PHENACOMYS. 31 upper molar with an anterior pyriform transverse loop, one external and one internal closed triangle, and a posterior trefoil (pi. iy, fig. 12a). Sometimes the outer loop of the trefoil is closed, giving the tooth two external closed triangles and a postero-internal loop (pi. iy, fig. 11a). • Lower molar series.—Line of infolding of enamel near outer side of tooth row. First lower molar with a posterior transverse loop, four greatly elongated internal triangles or digitatlons, of which at least two are completely closed, an anterior loop of variable shape, and three short external triangles, of which at least one is completely closed. Second lower molar with a posterior transverse loop, two greatly elongated internal triangles, of which one or both are closed, and two small external rounded triangles, one or both of which are closed. Third lower molar much larger than in Arvicola, as broad or nearly as broad anteriorly as posteriorly, with three greatly elongated internal loops, as in Synaptomys and Myorfes, but without external triangle, the outer side being plane or having at most only two convexities, which correspond with the middle and last loops, respectively. By refer- ence to the accompanying figures it will be seen that the last lower. Fig. 5.—Last lower molars of 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 Merriam, C. Hart (Clinton Hart), 1855-1942. Washington, Govt. Print. Off.
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