[24]Bergens Mus. Aarb., 1904, No. 3, p. 32, fig. 12. [25]Proc. Roy. Phys. Soc. Edinburgh, vol. 10, 1888-89, p. 13. [26]Amer. Nat., vol. 40, 1906, p. 357. [27]Journ. Anat. Phys., vol. 20, pl. 4, figs. 2 and 3, Oct. 1885. [28]Idem, pl. 4, fig. 1. [29]Bull. Soc. Linn. Normandie, ser. 6, vol. 1, pp. 216-225, pls. 1, 2 (skull); two text-figs. (tooth). [30]“The slight differences pointed out by Mr. True appear to be individual or local rather than specific.” (Van Beneden, Les Ziphioïdes des mers d’Europe, 1888, p. 100.) See also James A. Grieg, Bergens Museums Aarbog, 1897, No. 5, p. 19. [31]Proc. U. S. Nat. Mus., vol. 8, 1885, p. 585. [32]Trans. Roy. Micr. Soc., vol. 15, 1867, pl. 5, figs. 1, 2. [33]Bergens Mus. Aarb., 1904, No. 3, p. 26, fig. 10. [34]Sci. Results of the Voy. of the _Challenger_, Zool., vol. 1, pt. 4, Bones of Cetacea, 1880, p. 13. [35]See the following: Turner, W.—Trans. Roy. Soc. Edinburgh, vol. 26, 1872, p. 769. Flower, W. H.—Proc. Zoöl. Soc. London, 1876, p. 477. Fischer, P.—Act. Soc. Linn. Bordeaux, vol. 35, 1881, p. 113. Van Beneden, P. J.—Les Ziphioïdes des Mers d’Europe, 1888, p. 82. [36]An immature male might, of course, present the characters of the female, but in the former case the teeth would be open at the roots and but slightly, if at all, coated with cement. [37]As to reasons for assigning sexes thus, see p. 55. [38]Cope’s original description of this species was as follows: “Hyperodon semijunctus, sp. nov. The question whether a Hyperodon visits this side of the Atlantic, has at length been solved by the description which I have received through Dr. Alexander Wilcocks of this city, of a species taken in Charleston Harbor. This is well drawn up by Gabriel Manigault, who set up the specimen, which adorns the Charleston Museum. The points wherein it evidently differs from its congeners, the _H. bidens_ and _latifrons_, are, first, the separation of the four posterior cervical vertebræ, the three anterior only being solidly anchylosed, instead of the seven, as in the known species, even in the young, according to Dr. J. E. Gray. Second, the possession of one or more pairs of ribs added to the flying series, and of two more vertebræ, including ten dorsal instead of nine. (Nine are given by Cuvier, Ossemens Fossiles, viii, 188; and Flower, Proc. Zool. Soc. Lond., 1864, 419, for the _bidens_.) Five ribs are connected with the sternum, of which the anterior articulates with the seventh cervical by its inferior head. “I extract the following from Gabr. Manigault’s description: