ON THE OCCUKRENCE OF REMAINS OF FOSSIL POR- 

 POISES OF THE GENUS EURHINODELPHIS IN NORTH 

 AMERICA 



By Remington Kellogg 



Of the Bureau of Biological Survey, 

 United States Department of Agriculture 



Tertiary porpoises with very long beaks, whose distal extremities 

 are edentulous, have been known to science since 1867. Prof. E. D. 

 Cope described a porpoise of this kind from the Miocene of Charles 

 County, Maryland, under the name of Rhahdosteus latiradix.^ 



On December 17, 1867, Viscount DuBus- read a paper before the 

 Royal Academy of Sciences of Belgium in which similar porpoises 

 from the Black Crag formation of the Antwerp basin were described 

 and named Eurhinodelphis. The skulls of the European forms were 

 subsequently more or less fully described by Van Beneden, Gervais, 

 and others. Finally, in 1901, 1902, and 1905, these forms were 

 studied more thoroughly by Professor Abel,^ and his monographs 

 were accompanied by satisfactory illustrations. In the spring of 

 1907 F. W. True discovered a nearly complete skull of one of these 

 long-beaked dolphins in the Miocene clay at Chesapeake Beach, 

 Maryland, and subsequently William Palmer collected three im- 

 perfectly preserved skulls in the Calvert Cliffs, at points a few miles 

 below Chesapeake Beach. No vertebrae were found associated with 

 any of the skulls mentioned above. Hence the discovery of a fine 

 skull and lower jaws in association with 16 vertebrae, 10 ribs, a 

 humerus, scapula, and sternum by Norman H. Boss in August, 1918, 

 has supplied some much-needed information regarding the skeleton. 

 The acquisition of this material confirms the occurrence of the genus 

 Eurhinodelphis in North American Miocene formations. 



iCope, E. D., Proc. Acad. Nat. Sci. Philadelphia [vol. 19], pp. 132, 145. Mar. 10. 

 1S68„ and Journ. Acad. Nat. Sci. Philadelphia, ser. 2, vol. 6, p. 91, 1868 ; True, F. W., 

 Remarks on the fossil cetacean Rhahdosteus latiradix Cope, Proc. Acad. Nat. Sci. Phila- 

 delphia, pp. 24-29, text figs. 1-3, pi. 6, Apr. 22. 1908. 



=> DuBus, B., Sur quelques Mammifgres du Crag d'Anvers, Bull. Acad. Roy. Sci. 

 Belgique, ser. 2, vol. 24, p. 569, 1867 (1868). 



»Abel, O., Les dauphins lonsirostres du Bold^^ricn (Mioc&ne sup^rieur) des environs 

 d'Anvers, Mem. Mus. roy. d'hist. nat, de Belgique, Bruxelles, pt. 1, vol. 1, pp. 1-95, pis. 

 1-10, text figs. 1-17, 1901 ; pt. 2, idem, vol. 2, pp. 101-188, pis. 11-18, text flgs. 18-20, 

 1902 ; Les Odontocfetes du Bold6rien (Miocene supgrleur) d'Anvers. idem, vol. 3. pp. 

 1-155, text flgs. 1-27, 1905. 



No. 2563.— Proceedings U. S. National Museum. Vol. 66. Art. 26. 



9119—25 1 1 



