NO. 8 INTERRELATIONSHIPS OF THE CETACEA WINGE 



91 



True : An account of the Beaked Whales of the family Ziphiidffi in 

 the Collection of the United States National Museum, with re- 

 marks on some specimens in other American Museums ; Bull. 

 U. S. Nat. Mus., No. -/t,, 1910, pp. 1-89, pis. 1-42. Mesoplodon, 

 " Ziphius," " Bcrardius/' Hypcroodon. Figures of skulls and 

 skeletal parts. 

 Danois : Recherches sur les visceres et le squelette de Kogia brevi- 

 ceps Blainv. avec un resume de I'histoire de ce Cetace ; Arch. 

 Zool. exper. et gener., ser. 5, vol. 6, 1911, pp. 465-489, pis. 23, 24. 

 [Schulte: The skull of Kogia breviceps Blainv.; Bull. Amer. Mus. 



Nat. Hist., vol. 37, pp. 361-404, pis. 35-43. June 28, 1917.] 

 [Schulte and Smith: The external characters, skeletal muscles, and 

 peripheral nerves of Kogia breviceps (Blainville) ; Bull. Amer. 

 Mus. Nat. Hist., vol. 38. pp. '/-'/2, figs. 1-21. February 23, 1918.] 

 [Kernan and Schulte: Memoranda upon the anatomy of the respira- 

 tory tract, foregut, and thoracic viscera of a foetal Kogia 

 breviceps; Bull. Amer. Mus. Nat. Hist., vol. t^'^, pp. 231-267, 

 figs. 1-16. April 18, 1918.] 

 [Kernan: The skull of Ziphius cavirostris ; Bull. Amer. ]\Ius. Nat. 

 Hist., vol. 38, pp. 349-394, pis. 20-32. August I, 191 8.] 

 Cctorhynchus w^as established by Gervais on remains from Tertiary 

 strata in southern France. The most important fragment was the 

 anterior portion of an under jaw (figured in Osteographie des Cetaces, 

 pi. 57, fig. 12). The genus is discussed by Abel (Odontocetes du 

 Bolderien, 1905, pp. 94-98), who refers to it a piece of a lower jaw 

 from the Tertiary deposits at Antwerp. The mandible has a long 

 symphysis menti and a long row of close-placed alveoli for rather 

 large teeth. It is a peculiar fact that the alveoli are not completely 

 separated from each other. Only low transverse ridges separate the 

 teeth at their bases ; otherwise the teeth lay in a common groove. Abel 

 thinks that he sees in these conditions a beginning to the peculiarities 

 of the " ZipJiius" group. Perhaps he is right, but there are still 

 other possibilities. 



Anoplonassa probably belongs to the group Xiphii, quite likely as 

 a near relative of Xiphirostrum. It was described by Cope (Proc. 

 Amer. Philos. Soc, vol. 11, 1871, pp. 188-190, pi. 5, fig. 5) on the 

 basis of the anterior part of the mandible from Tertiary deposits at 

 Savannah, Georgia ; but it is best known from a paper by True 

 (Observations on the Type specimen of the fossil Cetacean Anoplo- 

 nassa forcipata Cope; Bull. Mus. Comp. Zool., vol. 51, 1907, pp. 97- 

 106, pis. 1-3). The fragment in question shows the mandibular rami 



