﻿NEW CRETACEOUS FOSSILS. 335 



Baculites Spillmani. PL 35, fig. 24. Obtusely ovate ; back flattened, front a 

 little raised or obtusely carinated ; sides with distant, very thick, obtuse, curved, 

 remote ridges. 



This is a beautiful species, even more highly iridescent than the preceding. The 

 lines of growth are similar in form to those of the former species but more strongly 

 defined. The septa are too imperfectly exhibited to be defined by a drawing. The 

 substance of shell thin. 



Dedicated to its discoverer Dr. W. Spillman. 



SCAPHITES, Parkinson. 



Scaphites iris. PI. 35, fig. 23. Substance of shell very thin, highly irides- 

 cent ; whole surface ornamented with pyramidal, distant tubercles, the inter- 

 vening spaces smooth ; back rounded, with two rows of tubercles, another row 

 runs along the junction of the lateral with the dorsal margin; sides flattened. 



A fragment of this beautiful species exhibits the extremely thin septa, in perfect 

 preservation and free from sand. 



The form of the septa is very unlike that in S. Conradi, to which species I referred 

 it in my introductory remarks. 



PL 35, fig. 31. Outlines of a species of Cytherina, Lam., somewhat enlarged. 

 Symmetrical, smooth, subrostrated at each end. C. tipjpana. 



Dr. Spillman has forwarded some fine specimens of Older Cretaceous shells from 

 the vicinity of Columbus ; among them is Nautilus orbiculatus, Tuomey. This shell 

 is a species of the genus Nautilites, of which four species have been found in North 

 America, as follows : 



NAUTILITES, Martin, Bronn. 



1. N. Vanuxemi, Con. (Pelagus,) Jour. Acad. Nat. Sc., vol. i. N. S. New Jersey. 



2. N. (Nautilus) orbiculatus, Tuomey. Proceed. Acad. Nat. Sc. 1845. Mis- 

 sissippi. 



3. N. (Nautilus) Alabamensis, Morton. Synopsis. PL 18, fig. 3. 



4. N. angustatus, Conrad. Dana's Geol. Exp., p. 728. Oregon. 



No. 1. was supposed to characterise an Eocene deposit, near Long Branch, N. J., 

 but it is more probably Cretaceous. 



