SUPPLEMENT. 
399 
that the characters of Jovdlania indicate affinities with the Cyrto- 
cerata of the Eifel, and some of those of the Bohemian Etages E_ 
and G, rather than with Ortlwceras. 
Under these circumstances I consider that it would bo advisable 
to constitute a separate family — Jovdlaniidce — for the reception of 
Jovellania^ as I suggested in Part I. of the present Catalogue i 
Supplement, p. 328). 
Xautilus Dehayi, Morton. [See suprcl^ p. 305.] Some interesting 
examples of this species (Nos. C. 3413-3417) have been recently 
added to the Collection ; presented by E. S. Cameron, Esq. They 
include very young, adolescent, and adult individuals, as well as 
several detached septa ; all undoubtedly belonghig to Morton’s 
species, as interpreted by F. B. Meek. The smallest specimen is 
about 1 inch in its greatest diameter, and 10 lines in its greatest 
breadth. The largest (a body-chamber, with one septum attached) 
is about 4 inches in its greatest diameter, and 3| in its greatest 
breadth. Bemains of the test adhere to the cast in this and the 
other specimens. They are all from the Cretaceous rocks of the 
“ Powder Kiver Bange,” Montana. 
The exact division of the Cretaceous from which they were de- 
rived is not known with certainty, but they are either from the 
Fort Pierre or the Eox Hills Group, these being the divisions in 
which Nautilus Delcayi is recorded by Meek*^ from the Cretaceous 
rocks of Nebraska. 
Eep. United States Geol. Surv. Terr. vol. ix. 1876, p. xxiv. 
