.M.\I{V[,.\\I) (!i:oi,<)(;iCAI. SURVFA' Ml 



the l-".(iccii(' (>r Scnitli (';iinliii;i liavL' Ijceii described by Lcidy,' and a 

 siiiLiiiliir bone from tb<' sjinic horizon supposed to belong to I'Jalax is 

 figured l)y Gibbes.' ('o|ic rccoid.- in all only one species of Actinoptery- 

 gians from tbe ]\rioccne ot .Maiylaiid (Spliyraciia Hpeciosa), and five 

 Jiiini the saiiH' horizon in New Jersey, as follows: Sphjraena speciosa, 

 N. sil'.fidnd, I'lKtsi/diiixJiis (jnilnii, ( ' nninininil us irrrtjidaris, and PJii/llo- 

 dus curvidens.^ The last-named genus is of exceptionally rare occur- 

 rence in the Amciican Tertiary, being known only by the four detached 

 dental plates notict'd by Wyman' and by ^iarsh;' The peculiar teeth first 

 described by Leidy from the Cretaceous of New Jersey under the name 

 of Ischjrhiza, occur also in the Miocene of Maryland and North Carolina, 

 if we may credit the statements of Cope "; and according to this author 

 certain coalesced caudal vertebrae ("hy])ural fans") accompanying the 

 Cretaceous teeth and occurring also in the Eocene of Maryland and 

 South Carolina s]u)u]d be referred to this genus, which he claims is re- 

 lated to the Esocidac. It is much more likely, however, that the Cre- 

 taceous fans belong to Protosphyraena or some similar form, and that 

 the Tertiary fans, which all agree in having the terminal centrum at- 

 tached, belong to one or more species of Sword-fishes. 



Genus XIPHIAS Linnaeus. 

 Fragmentary remains of Sword-fishes have been met with from time 

 to time in various Tertiary horizons, but in most cases are insufficient 

 for accurate identification. Detached rostra and hypural fans of large 

 size, both probably belonging to XipMas or some related genus, are not 

 uncommon in the Eocene of South Carolina. A number of such re- 

 mains, including the types of X. robustus Leidy, are preserved in the 

 Holmes Collection belonging to the American Museum of Natural His- 

 tory in New- York. Elere also is to be seen the tooth of Ischyrhiza mini 

 figured by Leidy in Holmes' Post-Pleiocene Fossils of South Carolina 

 (Plate XXV, Figs. 3, 4), Avhich is the most perfect specimen of that 



1 Jour. Acad. Nat. Sci. Pbila., 2nd ser., vol. viii, 1877, pp. 25-1-257, pi. xxxiv. 



2 J6«Z., vol. i, 1S49, p. 300, pi. xlii, figs. 10-13. 

 3Proc. Amer. Philos. Soc, vol. xiv, 1875, p. .362. 

 4 Amer. Jour. Sci., ser. ii, vol. x, 18.50, p. 234. 



sProc. Amer. Assoc. Adv. Sci., 18th Meet., 1870, p. 228. 



B Vertebrata Cret. Form. West, Kept. U. S. Geol. Surv. Territ., vol. ii,1875, p. 280. 



