MIOCENE PORPOISES — KELLOGG 153 



straight, differing in these respects from that of Delphinodon dividum 

 (True, 1912, pi. 25, fig. 4). The sigmoid cavity is rather large, the 

 narrower dorsal portion being bent almost at right angles to the 

 broader ventral articular surface. On the anterior face of the shaft 

 and contiguous with the sigmoid cavity there is a deep facet with a 

 prominent knob at its lower edge for articulation with the radius. 



Measurements of ulna (in millimeters) 



Greatest length of ulna 104. + 



Width of ulna near middle 21. 5 



Thickness of ulna near middle 13. 6 



Length of olecranon process 44. 5 



Literature cited 



Abel, O. 



1905. Les odontocfetes du Bolderien (Miocene sup6rieur) d'Anvers. M6ra. 



Mus. Roy. Hist. Nat. Belgique, vol. 3, 155 pp., 27 figs. 

 1931. Das Skelett der Eurhinodelphiden aus dem oberen Miozan von 

 Antwerpen. (III. Teil und Schluss der "Dauphins longirostres du 

 Bolderien [Miocene sup6rieur] des environs d'Anvers.") M6m. 

 Mus. Roy. Hist. Nat. Belgique, No. 48, pp. 191-334, pis. 19-29. 

 Allen, G. M. 



1941. A fossil river dolphin from Florida. Bull. Mus. Comp. Zool., vol. 

 89, No. 1, pp. 1-8, 3 pis. 

 Ameghino, F. 



1891. Caracteres diagndsticos de cincuenta especies nuevas de mamfferos 

 f6siles Argentinas. Rev. Argentina Hist. Nat., vol. 1, entr. 3a, 

 pp. 129-167, figs. 26-75. 

 Burmeister, H. 



1871. On Saurocetes argentinus, a new type of Zeuglodontidae. Ann. 

 Mag. Nat. Hist., ser. 4, vol. 7, No. 37, pp. 51-55, 1 pi. 

 Case, E. C. 



1904. Cetacea, in Clark, Systematic paleontology of the Miocene deposits 

 of Maryland. Maryland Geol. Surv., Miocene, pp. 1-56; atlas, 

 pis. 10-25. 

 Dal Piaz, G. 



1916. Gli odontoceti del Miocene Bellunese, Pt. 3. Squalodelphis fabiani. 

 Mem. Padua 1st. Geol., vol 5, pp. 1-34, pis. 1-5. 

 Gervais, p. 



1859. Zoologie et paleontologie FranQaises, ed. 2, viii + 544 pp., atlas, 

 xii pp., 84 pis. 

 Kellogg, R. 



1923. Description of two squalodonts recently discovered in the Calvert 



Cliffs, Maryland; and notes on the shark-toothed cetaceans. 

 Proc. U. S. Nat. Mus., vol. 62, art. 16, 69 pp., 20 pis. 



1924. A fossil porpoise from the Calvert formation of Maryland. Proc. 



U. S. Nat. Mus., vol. 63, art. 14, 39 pp., 18 pis. 



1925. On the occurrence of remains of fossil porpoises of the genus Eurhin- 



odelphis in North America. Proc. U. S. Nat. Mus., vol. 66, art. 

 25, 40 pp., 17 pis. 



