CEPHALOPODA OF THE CRETACEOUS MARLS. 277 
One tray in the Acad. Nat. Sci. is marked “Vincentown, N. J., T. M. 
Bryan.” 
BACULITES COMPRESSUS. 
Plate xLVI, Figs. 1, 2. 
Baculites compressus Say: Am. Jour. Sci., lst ser., vol. 2, p. 41; Morton, Synop- 
sis, p. 43, Pl. rx, Fig. 1, and probably of most authors where western 
examples are considered. 
Among the specimens sent me from the Acad. Nat. Sci., at Philadel- 
phia, as New Jersey fossils, I find the type specimen of this species, used 
by Mr. Say in his original description, and afterward figured by Dr. S. G. 
Morton as above cited. Mr. Say says that the specimen came to him from 
the collection made by Mr. Nuttal; that it was washed out from the banks 
of the Missouri River between White River and the Mandan settlements, 
as stated by Dr. Morton. The specimen was owned by and loaned to Dr. 
Morton by J. P. Wetherill, Esq., and I find his initials still on it in ink. 
The specimen has the lithological character of the western specimens, 
and not that of the New Jersey fossils. The specimen.is more compressed 
than are any of the New Jersey individuals when retaining their true form, 
and is slightly ovate, being narrower on-the siphonal edge than on the 
opposite. In other respects it presents the common features of the others 
as to rate of taper, number and position: of lobes, and generally so in 
details of bifurcation of the lobes, except in the divisions of the lobe 
nearest to the ventral edge, where the divisions are not always bilateral, 
there usually being a central much branched division, which results from a 
pressing over to one side of the principal part of the lobe by the greater 
size of or greater number of smaller branches on the side next to the ven- 
tral edge. This appears, however, to be more a defect in the specimen 
than a natural growth, as among a large number of examples of all sizes 
from the Fort Pierre group on Sage Creek, Dakota, I find this feature 
entirely absent; consequently it becomes quite impossible to find among 
western examples features in the detail of structure by which the two 
species of Mr. Say can be separated. I have given a very accurate figure 
of this historical specimen, and a detailed enlargement of one of the septa 
for comparison with the eastern forms. There is, however, one general 
feature of the western forms in which they differ entirely from any and all 
