XIPHIID.E. 
495 
Genus HISTIOPHORUS, Lace'pede. 
[Hist. Nat. Poiss. vol. iii. 1802, p. 374 (htiophorus).} 
The fossils provisionally ascribed to this genus are fragments of 
rostrum, named only for convenience of reference. Each pre- 
roaxilla is traversed by one principal longitudinal nutritive canal, 
w hich disappears towards the extremity of the bone. 
Histiophorus eocaenicus, sp. nov. 
[Text-figure 18, no. 2.] 
Type. Rostrum ; British Museum. 
Rostrum rather short and stout, depressed oval in transverse 
section, its outlines shown in fig. 18, no. 2. Premaxilhe firmly 
fused distally and nutritive canals soon obliterated. 
Torm. Imc. Middle Eocene : Bracklesham Bay. 
25744. Type specimen, vertically crushed iu its anterior half, its 
outline shown from above and in transverse section of one 
third nat. size in fig. 18, nos. 2, 2a. The nasal bones are 
large, and the rostrum is already quite solid at the point 
marked a, where the transverse section 2a has been cut. 
The surface of the bone seems to have been quite smooth. 
Dixon Coll. 
Histiophorus rotundus, sp. nov. 
[Text-figure 18, no. 3.] 
Type. Rostrum ; British Museum. 
Nostrum very short and stout, not much depressed, its outlines 
8 Wn in fig. is, no. 3. . 
Form. £ Jjoc. Tertiary Phosphate Beds : South Carolina, U.S.A. 
®799. Type specimen, shown in outline from above and in 
transverse section, of one third nat. size, in fig. 18, nos. 
3, 3a; Cooper River, Charleston. The premaxili® are 
completely fused together, and the outer face, as preserve , 
is rugose." Presented by Thomas Boyle, Esq., 1898. 
Fossil rostra have also been ascribed to this genus under the 
following names : 
Histiophorus antiquus, E. D. Cope, Proc. Boston Soc. Nat. Hist, 
vol. xii. (1869), p. 310. Xiphias antiquus, J. Leidy, 
Proc. Acad. Nat. Sci. Philad. vol. vii. (1856), p. 397. 
Eocene Greensand ; Burlington Co., New Jersey. 
Histiophorus parvulus, 0. C. Marsh, Proc. Amer. Assoc. Adv. Sci. 
1869 (1870), p. 227.— Eocene ; New Jersey. 
