BUCHICERATID 2. 31 
stouter and more quadragonal volution than any other species of this genus. 
The originals of this species were not reexamined. They could not be 
found in the Academy’s collection at the time of my visits, nor has subse- 
quent search, made by the kindness of Professor Pilsbry, brought them to 
light. 
Locality: Quebrada de Colpamayo, Department of Cajamarea, Peru. 
Age: Upper Cretaceous. 
ROEMEROCERAS SYRIACIFORME Hyatt. 
Pl. I, figs. 10-14. 
foemeroceras syriaciforme Hyatt, 1875, Proc. Boston Soc. Nat. Hist., Vol. XVII, 
p- 371. 
This species reaches a diameter of 90 mm. in one cast without a living 
chamber. The sutures are approximated and overlap internally on the 
auxiliaries, showing that the gerontic stage has begun. The ornamentation 
and form are the same as in bilobatum. When the east is only 29.5 mm. in 
diameter there is, however, no difficulty in separating this from bilobatum. 
It is more compressed, the sides broader, the venter narrower and flatter. 
The sutures have more resemblances to those of R. gabbi, but the saddles 
and lobes are never so short, nor truncated, the saddles being narrower and 
the lobes broader. The ventral lobe and siphonal saddle are similar, but 
narrower and less digitated. The first lateral saddles are similar in being 
bifid and rather broad, but already at this early stage show denticulations 
over the entire base. The first lateral lobe is similar but less deeply divided, 
by the similar marginals. The second lateral saddles are unequally bifid 
with bases rounded or approximately phylliform, entire, and unlike those of 
gabbi. The second lateral lobes are quite broad, apically like the first 
laterals, but are unequally quadrifid. he third lateral saddle is as broad 
as the second lateral, and also bifid. It occupies part of the side and also 
part of the umbilical zone, the marginal lobe being upon the umbilical 
shoulder. Inside of this there is one broad bifid saddle reaching to the 
lobe at the line of involution. There are therefore four saddles at this early 
stage very like those of gabbi, except in having rounder bases. Later, on 
the same volution, this inner saddle becomes divided into two by a median 
marginal lobe, and still later a small lobe makes its appearance at the line 
of involution, completing the outline of the innermost lateral saddle. 
There are then five saddles and six zygos lobes on either side. 
