72 PSEUDOCERATITES OF THE CRETACEOUS. 
473 of the work cited shows acute wings to the siphonal saddle; these are 
plylliform in the specimen, as is usual in this species. The marginal lobes 
of the ventral lobe are too pointed in this figure. The auxiliary saddles 
have not the acute corners as figured. The entire saddle in fifth column of 
lowest suture is a mistake; it is bifid like the others above. The siphonal 
saddle is not perfectly entire; there is a minute marginal depression on 
either side of the center, which is elongated, forming a very minute-pointed 
but narrow saddle on the keel. The umbilicus is present and plugged with 
dark matrix, and the shell is present all around and is very thick. This 
was entirely overlooked in the drawing. The figure on pl. 34 was taken 
from the same specimen before it had lost the very friable shell that once 
covered the sides, or else the shell was in large part restored. In this figure 
the umbilicus is too large. The fold-like costze as figured are visible only 
on the outer half of the outer volution, but are slightly curved, not straight, 
and are more decided than in the figure The inner half of this volution 
and the outer part are smooth zones with no elevations perceptible to the 
eye or touch. 
A fine young one of this species (Pl. VIII, figs. 1, 2) (Coll. National 
Museum, Moreau River, South Dakota), has the living chamber only partly 
preserved. The septa and sutures are straight and closely approximated 
even at this stage, but the overlapping in consequence of this is more 
decided near the umbilicus, the two outer saddles and first lateral lobes 
being free on account of a slight bend orad in this part and the greater 
space at the periphery. According to Meek’s figure the increase in size and 
length of these saddles in the later stages brings them into contact. The 
lobes and saddles of this specimen are similar to the style of Meek’s wood- 
cut on page 473, differing only in certain details. 
There are six columns of divided saddles on the left, the only side 
visible; the first and second are just passing from the bifid to the trifid type, 
the third and fourth are also passing from the bifid to the quadrifid type, 
the fifth is bifid, and the sixth passes on the first and second quarters of 
this volution from an entire outline into a bifid condition. The five inner 
columns are entire and the fifth column is seen coming in on this volution. 
The spiral arrangement of these inner entire saddles is prettily shown in 
the umbilicus. 
The lobes all belong to the trifid type except the three inner ones 
which are entire. There is a steady series of eradations in complexity 
