382 Systematic Paleontology 



Scaphites hippocrepis (DeKay) Morton 



Ammonites hippocrepis EeKay, 1827, Ann. N. Y. Lye. Nat. Hist., vol. ii, 



pp. 273-277, pi. v, fig. 5. 

 Scaphites cuvieri Morton, 1827, Jour. Acad. Nat. Sci., Phila., 1st ser., vol. vi, 



p. 109, pi. vii, fig. 1. 

 Scaphites hippocrepis Morton, 1834, Syn. Org. Rem. Cret. Group, U. S., p. 



41, pi. vii, fig. 1. (S. cuvieri on plate.) 

 Scaphites hippocrepis Meek, 1864, Check List Inv. Fossils, N. A., Cret. and 



Jur., p. 24. 

 Scaphites hippocrepis Conrad, 1868. Cook's Geol. of New Jersey, p. 730. 

 Scaphites hippocrepis Whitfield, 1892, Mon. U. S. Geol. Survey, vol. xviii, 



p. 262, pi. xliv, figs. 8-12. 

 Scauhites similis Whitfield, 1892, Ibidem, p. 267, pi. xliv, figs. 1, 2. 

 Scaphites hippocrepis Johnson, 1905, Proc. Acad. Nat. Sci.. Phila., p. 27. 

 Scaphites similis Johnson, 1905, Ibidem. 

 Scaphites hippocrepis Weller, 1907, Geol. Survey of New Jersey, Pal., vol. 



iv, p. 826, pi. cvii, figs. 3-6. 



Description. — " Externally smooth, with slight transverse elevations, 

 which in the smaller whorls are very distinct; each whorl envelopes one- 

 half of the internal contiguous whorl, and thus gives to the septum a 

 peculiar lunated appearance. This is supposed to be the last chamber, 

 and a considerable prominence on each side near the outer lip may be con- 

 sidered as analogous to corresponding parts in the Nautilus, where the 

 lips fold round in order to be connected with the sides. The septum 

 irregular, with tubercles on its surface, which towards its junction with 

 the sides of the shell assume a branched appearance similar to the divisions 

 of the Baculites. The outline of the septum, as may be seen by reference to 

 the figure, is semi-lunated, with the horns produced and somewhat 

 approximated. Thickness one inch. Conjectured diameter of the whole 

 shell two inches."— DeKay. 1828. 



Occurrence. — Matawan Formation. Ulmstead Point, Anne Arundel 

 County. 



Collections. — Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences. 



Outside Distribution. — Matawan Formation. — Merchantville clay, New 

 Jersey. 



