Smithsonian miscellaneous collections . t it 2 Because of the peculiar form and eruption of tillodont lower molariformteeth, their transverse diameters cannot be given with any meaning. 3 No. 1105, type of Esthonyx burmeisterii. 22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121 may represent a distinct species for which the type is not near itsmean. In consideration of certain specimens which he mentioned ascoming from Sand Coulee and Clark Fork horizons, and which seemto be distinct from E. hisulcatus, but cannot be logically distinguishedfrom E. spatularius, Me are faced with the fo
Smithsonian miscellaneous collections . t it 2 Because of the peculiar form and eruption of tillodont lower molariformteeth, their transverse diameters cannot be given with any meaning. 3 No. 1105, type of Esthonyx burmeisterii. 22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121 may represent a distinct species for which the type is not near itsmean. In consideration of certain specimens which he mentioned ascoming from Sand Coulee and Clark Fork horizons, and which seemto be distinct from E. hisulcatus, but cannot be logically distinguishedfrom E. spatularius, Me are faced with the following alternatives:allocating all to E. hisulcatus, which appears to be an unlikely arrange-ment ; naming a new species on one of the geologically older andperhaps more typical specimens, with E. spatularius in synonymy withE. hisulcatus, though certainly within the size range of the new namedform ; or retaining E. spatularius as the name for these distinctly smallindividuals of Esthonyx, appreciating that the E. spatularius type may. Fig. 4.—Esthonyx spatularius Cope: Portion of left ramus of mandible withMs (\I. No. 4809), type specimen, occlusal and lateral views, X i- SandCoulee or lower Gray Bull lower Eocene, Wyoming. Fig. 5.—Esthonyx cf. spatularius Cope: Left ramus of mandible ( ), occlusal and lateral views, X i- Qark Fork upper Paleocene, Wyoming. not be near the mean. As a tentative measure, until such time as amore adequate representation of Clark Fork and Sand Coulee popu-lations are at hand to verify or indicate a more satisfactory conclusion,I propose to retain E. spatularius. Such a tentative solution has in itsfavor the evidence outlined below, demonstrating a Gray Bull, and ahighly probable lower Gray Bull or Sand Coulee, origin for the type. Further investigation of the probable locality from which Wortmanobtained the type of E. spatularius has demonstrated beyond reason-able doubt that the specimen is not from the A\ind Riv
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