EULOPHOCERATID 2. 87 
broad saddle, but shorter than the fourth and has two arms, the outer 
bifid, the inner trifid. The sixth is a long entire remnant of the primitive 
second lateral saddles of the nepionic stage occupying the umbilicus. The 
inner part of the outline of this saddle is faintly concave, especially where 
it crosses the shoulder, but no definite lobe is formed. The lateral lobes 
are cut up by marginals on their entire outlines. The first laterals are 
about as long as the short narrow arms of the ventral; the second laterals 
are about a third longer and fully twice as broad; the third laterals are 
about the same size and length as the first laterals: the fourth are shorter 
and about the same breadth; the fifth is narrow and divided by two minute 
tongue-like saddles. These form a column near the umbilical shoulder of 
the cast. 
On the right side the third lateral or first auxiliary saddle is very 
much smaller at the same age, and apparently subdivided with at least one 
dividing lobe, giving one more lobe and one more saddle on this side. The 
fifth is also narrower and has a simple trifid outline. The remaining 
saddles and lobes also differ, and in fact this side of this specimen might 
be described as belonging to a distinct species. The first and second 
laterals are larger and the marginals fewer in number, but the principal 
difference lies in the second or primitive lateral lobe. ‘This is bifid, divided 
by one very large median marginal saddle. There are, however, but two 
principal lateral saddles on both sides. 
The outlines of these sutures are entirely distinct from those of any 
species of Sphenodiscus. The bodies of the saddles are solid and the 
complicated outlines are made by the outgrowth of long tongue-like 
marginals, the lobes being divided*in the same way. The only suture so 
far figured having a similar outline is that of Tegoceras mosense. 
The ventral lobe is very broad, the outline sinuous, the center 
occupied by a small lobe divided by a sharp minute saddle. There are 
two arms to the ventral lobe, short, narrow, and bifid, and parallel with the 
venter. These are quite different from the usual spreading arms of this 
lobe in Sphenodiscus and Coilopoceras. The auxiliary saddles are even 
more distinct as described above and together with the number of the 
principal lateral saddles show that we are dealing with a species that can 
not be included in Sphenodiscus nor in Codlopoceras. 
Locality: Port Natal, South Africa. 
Age: Upper Cretaceous. 
