, 50 University of California Publications in Geology [Vol. 13 



and the other to the walrus, Trichechus rosmwus. These skulls were 

 discovered at the depth of thirty feet in an excavation in a street of 

 Hamburg, Germany. 



Nothing more was known concerning the predecessors of the 

 walrus until Gratiolet 3 " received a fragment of a walrus skull from 

 Lartet. This skull was excavated by a workman in the digging of 

 a well at Montrouge, near Paris, France. It is not known in exactly 

 what formation this specimen was found, but Gratiolet thought it 

 belonged to the diluvial deposits, and, in honor of his friend, he named 

 it Oelobcnothcrium lartetianum. A few years later Defrance 31 re- 

 ported the finding of a skull of a fossil walrus in alluvial deposits near 

 Saint-Menehoukl, in the Department of Marne, France. He ques- 

 tioned the necessity of erecting a new genus and species for the skull 

 fragment described by Gratiolet, and states that he could find no 

 differences between this fragment and the corresponding part of the 

 skull of the living walrus. Still later, Van Beneden 32 states that 

 Schaaffhausen 33 had reported, at a meeting of the Society of the Bas- 

 Rhine, the finding of part of a walrus skull, with ligaments intact, 

 at Cologne. Germany. This skull is undoubtedly recent, as Schaaff- 

 hausen has endeavored to show. Van Beneden 34 also mentioned the 

 finding of a vertebra of Trichechus rosmarus, near Deurne, and a 

 scaphoid, from the vicinity of Antwerp, Belgium. More recently a 

 walrus skull floated ashore near Heyst. This skull was considered by 

 Rutten 35 to be diluvial in origin. 



In 1828 a silicified skull of a fossil walrus found on the sea beach 

 in Accomac County. Virginia, was sent to Dr. Mitchill 36 by a Mr. 

 Cropper. This skull was the same one upon which De Kay 37 several 

 years later based his name Trichecus virejinianus. Sir Charles Lyell 38 



30 Gratiolet, P., Note sur un fragment de crane trouve a Montrouge, pres Paris. 

 Bull. Soe. Geol. de France (2), vol. 15, pp. 620-624, pi. 5, figs. 1-3. Paris, 1858. 



31 Defrance, G. A., Note sur un crane de morse (Trichechus rosmarus Linn.) et 

 autres debris fossiles trouves dans une depot quaternaire, pres la ville de Sainte- 

 Meneliould (Marne). Bull. Soc. Geol. de France (3), vol. 2, pp. 164-170. Paris, 

 1874. 



82 Van Beneden, P. J., Ann. Mus. Roy. Hist. Nat. de Belgique, Brussels, vol. 1, 

 pt. 1, p. 41. 1877. 



33 Schaaffhausen, Verhandl. natur. Vereines preuss. Rheinlands und Westfalens 

 (4), vol. 3, pp. 246-248. 1876. 



3* Van Beneden, P. J., op. ext., p. 46. 

 3 ^ Butten, L., op. cit., p. 11. 



36 Mitchill, S. L., Smith, J. A., and Cooper, W., Discovery of a fossil walrus 

 in Virginia. Ann. Lyc. Nat. Hist. New York, vol. 2, pp. 271-272. 1828. 



87 De Kay, J. E., Zoology of New York, Mammalia, pt. 1, p. 56, pi. 19, fig. 1. 

 Albany, 1842. 



3 « Lyell, 0., Am. Jour. Sci. (1), vol. 46, p. 319. 1844. Proc. Geol. Soc. London, 

 vol. 4, p. 32. 1846. 



