Note on Polynomial Interpolation to Analytic Functions.

last upper and lower molars. Chumashius balchi cannot, therefore, be regarded as occurring in the direct line of development leading upward to the Recent tarsier. In lower dental formula Chumashius exhibits a closer relationship to Omomys and Hemi4codon than to Anaptomorphus and Tetonius. The character of the lower posterior premolars in Uintanius suffice to remove this Bridger genus from any close relationship with the Simi form. In addition to the presence of a comparable number of lower teeth the structural details of the dentition, in so far as these are known, point also to a kinship between Chumashius and that division of the Anaptomorphidae including Omomys and Hemiacodon. The characters of the Simi genus suggest a development from those of an antecedent form like Omonys or Hemiacodon. Possibly Euryacodon is also situated close to the stem form from which Chumashius has evolved. No previously described tarsiid from the North American Eocene has been found in association with a fauna as advanced as that occurring with Chumashius balchi at Locality 150 in the Sespe deposits of the Simi Valley region, California.6 1 Wortman, J. L., Amer. Jour. Sc., 15-17 (1903-1904). 2 Matthew, W. D., Bull. Amer. Mus. Nat. Hist., 34,445-465 (1915). 3 Gregory, W. K., Mem. Amer. Mus., n. s., 3, pt. 2 (1920). " Gregory, W. K., Bull. Geol. Soc. Amer., 26, 419-446 (1915). 6 Stock, C., Proc. Nat. A cad. Sci., 18, 518-523 (1932); 19, 434-440, 481-486, 762767 (1933).