. Bulletin - United States National Museum. Science. 252 BULLETIN 169, UNITED STATES NATIONAL MUSEUM Diagnosis—Gidlej'' "P^ to M^^SH- mm; NP-^^ mm; length of M' = mm, greatest width= mm, width across hypocone and metacone= mm, greatest width of M^= mm, other measure- ments of this tooth same as those of M^; parastyle and mesostyle prominent, mesostyle angular and continuous with the ectoloph; P^ with uninterrupted internal cingulum, and with low but well-defined lophs connecting the summit of the protocone with the protoconule and base of the metacone ;.
. Bulletin - United States National Museum. Science. 252 BULLETIN 169, UNITED STATES NATIONAL MUSEUM Diagnosis—Gidlej'' "P^ to M^^SH- mm; NP-^^ mm; length of M' = mm, greatest width= mm, width across hypocone and metacone= mm, greatest width of M^= mm, other measure- ments of this tooth same as those of M^; parastyle and mesostyle prominent, mesostyle angular and continuous with the ectoloph; P^ with uninterrupted internal cingulum, and with low but well-defined lophs connecting the summit of the protocone with the protoconule and base of the metacone ;. Figure 72.—Gidteyina montanensis (Gidley), Princeton Univ. no. 12048, left upper jaw: a, External view; 6, crown view. One and one-half times natural size. Discussion.—The P^ probably associated with the type is a simple 2-rooted tooth with one laterally compressed external cusp, somewhat anterior on the crown, and a small posterointernal expansion of the base but not true protocone. My measurements of the type are as follows: P^-IVP, ; M^~^, ; length P^, ; width P^, ; length P^ ; width P^, ; length PS ; width V\ ; length M', ; width M^, ; length M-, ; width M^, Two other specimens from the same cluster of localities all at about the same level are in the Princeton collection. Princeton no. 14195 is an M^ similar to that of the type but slightly larger and with the hypocone more internal. These could be individual variations. Princeton no. 14190 is an isolated P4 mm in length and mm in width. Its size is almost exactly that of the corresponding tooth of ?G. silberlingi, but the protoconid and metaconid are closer to each other and the metaconid is relatively more posterior. '* I quote Dr. Gidley's diagnosis from the draft in which he placed the species in a new genus. His other two diagnoses view it as a species of Tetraclaenodon and of Ectocion, respectively, and are therefore inappro- Please note that these image
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