64 PSEUDOCERATITES OF THE CRETACEOUS. 
more perfect on the side opposite to the one figured. The first lateral sad- 
dles are trifid, the second, third, fourth, and fifth are bifid and phyllitorm; 
the remainder are similar to those of the inner columns of others of this 
species, but are perhaps somewhat simpler in outlines. The exact number 
was not ascertained. On a fragment of what appeared to be the same 
species from the same locality, there were thirteen saddles at a diameter of 
60 mm. from line of involution to venter. This was a cast, and slightly 
abraded on the venter. The ventral saddles were much worn and the first 
lateral saddles were entire, except for a faint median marginal in two 
sutures. The remaining lobes and saddles exactly agreed with those of 
the ephebic stage of the first specimen described, except in being a trifle 
longer. ‘There were five divided saddles, as in other specimens. 
One of the figures of Amm. pedernalis given by Binckhorst in the 
monograph quoted above was taken from a Texas specimen supposed to 
be identical with von Buch’s species. The specimen was in the Museum of 
Stuttgart, and was said to have come from Rio Bravo del Norte, Texas, and 
to have been collected by Schott. This figure is identical with the larger 
varieties of this species which retain the acute venter until a late stage 
of development. This same specimen was refigured by Bohm, as above 
quoted, and properly named by him. Except in being somewhat older 
and large, it is identical with the fossil figured on Pl. III, fig. 15 (septum), 
and Pl. V, fig. 3. The first lateral saddles are, however, bifid, the second 
trifid, the third to fifth bifid, whereas all the saddles in sutures on Pl. II 
are bifid, and this holds in all the sutures on this volution in this fossil. 
Even in the close approximation of the sutures this is similar to Bohm’s 
figure and also in the way in which the inner line of nodes trend outward 
on the latter part of the volution. ; 
A fragment in the collection of Frederick Braun, of Brooklyn, N. Y., 
is labeled as from rotten limestone grit, Brooksville, Noxubee County, Miss. 
The diameter of side is 55 mm. The inner line of nodes still remains 
somewhat elongated; the outer line is superseded by broad folds. The 
fine surface of this cast shows that the shell had sigmoidal, and sometimes 
dichotomous, coste and ridges on the outer convex half of the volution, 
but that it was smooth and decidedly concave on the inner half. The first 
lateral saddles were trifid, then four bifid and nine entire.. There were ten 
entire dorsal saddles at the same age, with lobes ‘like those of the exposed 
