PACHYCORMIDiE. 
409 
not exceeding 0*055 in-a specimen measuring 0*025 in transverse 
diameter where the vomerine teeth are implanted. Upper aspect 
of rostrum flattened, almost hollowed, the sides converging below 
so that the transverse section appears triangular with rounded 
angles; surface smooth or in part slightly rugose. 
Form. Sf Log. Cenomanian (Cambridge Greensand); Cambridge¬ 
shire. 
Not represented in the Collection. 
Protosphyrsena nitida (Cope). 
1872. Erisichthe nitida, E. D. Cope, Proc. Acad. Nat. Sci. Philad. 
p. 281. 
1874. Erisichthe nitida, E. D. Cope, Bull. U. S. Geol. Surv. Territ. 
vol. i. no. 2, p. 42. 
1875. Erisichthe nitida, E. D. Cope, Vert. Cret. Form. West (Hep. 
U.S. Geol. Surv. Territ. vol. ii.), p. 217, pi. xlviii. figs. 3-8. 
1877. Erisichthe nitida, E. D. Cope, Bull. U.S. Geol. Surv. Territ. 
vol. iii. p. 821. 
1890. Protosphyrcena nitida, J. Felix, Zeitschr. deutsch. geol. Ges. 
vol. xlii. p. 278, pis. xii., xiii., pi. xiv. figs. 2-7. 
1892. Protosphyrcena nitida, A. R. Crook, Palaeontogr. vol. xxxix. 
p. 110. 
Type. Portions of skull; 
The type species of the so-called genus Erisichthe. Postrum 
much elongated, slightly recurved, and attaining a length of about 
0*155 with a transverse diameter of 0*025 at its base where the 
vomerine teeth are implanted ; flattened above in its distal half, 
the transverse section in this region is semicircular, a strong angle 
on each side limiting the superior plane, while the section at the 
base of the rostrum is a transverse oval; the flattened upper surface 
finely rugose, the remainder ornamented with closely arranged 
longitudinal ridges, in part reticulated. 
Form. § Log. Upper Cretaceous (Niobrara Group) : Kansas, U.S.A. 
Not represented in the Collection. 
Protosphyreena penetrans (Cope). 
1877. Erisichthe penetrans, E. D. Cope, Bull. U.S. Geol. Surv. Territ. 
vol. iii. p. 822. 
1890. Protosphyrcena penetrans, J. Felix, Zeitschr. deutsch. geol. Ges, 
vol. xlii. p. 297, pi. xiv. fig. 1. 
1892. Protosphyrcena penetrans, A. R. Crook, Palaeontogr. vol. xxxix. 
p. 109. 
Type. Rostrum. 
Rostrum much elongated and attaining a length of about 0*15 
