. Bulletin - United States National Museum. Science. Figure 70.— Tttradaenodon symbolicus Qidley, no. 6169, right lower jaw (with Mj): a, Crown view; b, internal view. One and one-half times natural Figure ll.—Teiraciaenodon syinbolicus Gidley; a, no. 6168, right Mi_2, crown view; a', same internal view; 6, Princeton Univ. no. 13757, right Ms-3, crown view. One and one- half times natural size. Diagnosis.—Gidley: "This species is smaller than E. [Tetraclaenodon, G. G. puercensis, being about intermediate in size between that species and E. minor [= Tetraclaeno
. Bulletin - United States National Museum. Science. Figure 70.— Tttradaenodon symbolicus Qidley, no. 6169, right lower jaw (with Mj): a, Crown view; b, internal view. One and one-half times natural Figure ll.—Teiraciaenodon syinbolicus Gidley; a, no. 6168, right Mi_2, crown view; a', same internal view; 6, Princeton Univ. no. 13757, right Ms-3, crown view. One and one- half times natural size. Diagnosis.—Gidley: "This species is smaller than E. [Tetraclaenodon, G. G. puercensis, being about intermediate in size between that species and E. minor [= Tetraclaenodon pliciferus, G. G. S. ]. The lower molars are proportionately narrower transversely than those of the former species,* and the lower jaw is much shallower. This last character may be due in part, however, to a less mature condition of the specimen, which represents a young individual with the first true molar just coming into use.^ The striking similarity in detail of the lower molars with those of E. [T., G. G. puercensis is a notable feature of the species and separates it clearly from E. minor [T, pliciferus, G. G. S.]. The more notable points of similarity are the slight roughening and wrinkling of the enamel surface and a tendency of the lophs of the teeth to break up into small ; ^ Simpson: Intermediate between T. pliciferus and T. puercensis in size, but nearer the former both in size and in structure. The only constant difference from T. pliciferus is the greater size, inadequate for specific differentiation were it not constantly correlated with the * And within the range of T. pliciferus in this proportion.—O. O. S. • A specimen of T. pliciferus of comparable age has a deeper jaw, despite its smaller teeth but a referred specimen of T. symbolicus also has a deep jaw. This is probably a highly variable character, and also depends on crushing to a considerable degree.—Q. G. S. « From figures of the Torrejon specimens this would seem a s
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