76 PSEUDOCERATITES OF THE CRETACEOUS. 
basal parts of the saddles have marginal lobes like those of lobatus, but 
these are longer and divide up the body of the saddle more completely, 
making a more complicated outline, with long, phylliform, marginal saddles 
on the first three saddles. The lobes and saddles of the inner part are 
very closely similar to the older ones of the typical specimens described 
above, having similar phylliform branches and deeply cut outlines. 
At a diameter from line of involution to venter of 43 mm. in the younger 
fragment the sutures are closely approximate, the outlines overlap shghtly 
on the third, fourth, and fifth columns and then separate toward the centran 
surface, but remain close and become overlapped again near the umbilicus. 
The lobes and saddles are comparatively long and with highly complex 
outlines even at this stage, and the phylliform marginal saddles remind one 
strongly of Phylloceras. ‘These are shorter and stouter than the same parts 
in the older stage, but even at this stage the first lateral saddles are more 
complex than the sutures of var. magnificus and the whole aspect is more 
phylliform. The first lateral saddles are trifid, but obviously modified from 
the bifid type; the second, third, and fourth are quadrifid, modified 
from the bifid type; the fifth is bifid; the sixth is beginning to show the bifid 
division on the right side, but on the left is entire. There are twelve sad- 
dles in all, but the remainder are entire and tend as usual to become shorter 
and flatter. The ventral saddle is similar to that of var. magnificus and 
S. lobatus, with large, rounded, marginal saddles at the corners. The ven- 
tral lobe is broad with broad and short branches, belonging to the trifid 
type. The remaining lobes are complicated with marginal branches, but 
are of the bifid type, although this is not so noticeable in the first five lobes 
as in the smaller and less complex ones of the sixth to the twelfth column. 
There may have been one more pair of lobes inside of these which were 
broken away. 
From line of involution to venter the large fragment had a diameter of 
103 mm. with the same surface features as on the smaller cast, but with the 
venter not so acute. The sutures are older and more complex, as noted 
above, and there were the same differences beuween the two sides. 
There are twelve lobes and thirteen saddles, and there was certainly one 
row of lobes broken away and probably another of saddles gone from the 
umbilical edge. The inner three saddles are considerably flattened; the 
next four rows are rotund, as in the younger stage described above; and 
