Smithsonian miscellaneous collections . osterior diameter P^ transverse diameter P*, anteroposterior diameter, externally P*, transverse diameter, anteriorly M^ anteroposterior diameter, externally M\ transverse diameter, anteriorly M^ anteroposterior diameter, externally ... M^ transverse diameter, anteriorly ... AP, anteroposterior , perpendicular to an-terior face M, transverse diameter, anteriorly 28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121 Lower dentit
Smithsonian miscellaneous collections . osterior diameter P^ transverse diameter P*, anteroposterior diameter, externally P*, transverse diameter, anteriorly M^ anteroposterior diameter, externally M\ transverse diameter, anteriorly M^ anteroposterior diameter, externally ... M^ transverse diameter, anteriorly ... AP, anteroposterior , perpendicular to an-terior face M, transverse diameter, anteriorly 28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121 Lower dentition: ^°^ ^^°-^ P3, anteroposterior diameter Ps, transverse diameter P4, anteroposterior diameter Ml, anteroposterior diameter M2, anteroposterior diameter M3, anteroposterior diameter a, approximate. ESTHONYX GRANGERI Simpson, 1937 Text figures 9, 10 Type.—Leit lower jaw with P4-M3, No. and —Clark Fork or Sand Coulee, at head of BigSand Coulee, Clarks Fork Basin, Fig. 9.—Esthoyiyx grangcri Simpson: Left ramus of mandible ( ), type specimen, occlusal and lateral views, Xi- Clark Fork upperPaleocene or Sand Coulee lower Eocene, Wyoming. (After Simpson, 1937.) Specific characters.—Significantly larger than Esthonyx bisulcatus,but approached in size by individuals of E. acutidens and E. in part by inflated appearance of tooth cusps, and bythe less striking development of styles and cingula of the upper cheekteeth. P** shows an advanced degree of separation of the metacone(or tritocone), but with hypocone (or tetartocone) of P4 well advanced. NO. 10 TILLODONTIA—GAZIN 29 Discussion.—This particularly large species of Esthonyx is knownonly from the Clark Fork and Sand Coulee horizons, unless it is repre-sented by a Princeton Gray Bull specimen (No. 14727, see fig. 21),and so far as we know, did not give rise to any of the later dive
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