464 
be seen, but it was clear that the impressed zone had become nar- 
rower and shallower. The termination of the living chamber being 
also absent, it could not be ascertained whether it finally disappeared 
or not on the dorsal rim of the aperture. 
SCHROEDEROCERAS TUBULATUM, h.s. PI. vii, Figs. 1-3, and Pl. xiv, 
Figs. 6-12, >#. 
Loc., Brevig, Norway. 
This species was included by Saemann under the head of angu- 
Zatum, but it has much broader whorls, increases more slowly in 
size and the free part of the whorl is longer, not only the living 
chamber but a considerable portion of the septate whorl being free. 
A cast of the latter part of the first or first part of the second 
whorl is costated, and the narrowness of the side shows that the 
young whorl was not so broad ventro-dorsally as in angudatus at the 
‘same stage. 
One specimen shows the living chamber in the ephebic stage be- 
fore the uncoiling begins. ‘This is of about the same age as that 
figured by Saemann in his anmgulatus, Section 1d. The ventro- 
dorsal diameter of the septal floor of this is 26 mm., and the trans- 
verse about 32 mm. ‘The venter was the broadest part at this stage 
as it is in the early ephebic stage of angudatum. The umbilical | 
shoulders do not exist even in the rounded form that they take on 
in the adult of amgu/atus and in the ephebic and gerontic whorls of 
Saemann. ‘The sides incline or diverge outwardly more decidedly 
and are flatter than in Saemanni at the same stage. 
The shell has coarse lines of growth upon this living chamber at 
more or less irregular intervals, with finer lines between them, and 
at still rarer and less regular intervals there are the usual narrow 
ridges which are the remains of the costee of earlier stages. The 
ventral sinus is broader and deeper than in angulatus or Saemanni 
at the same stage, and there is a deep sinus in the impressed zone 
on the dorsum with a shallow subacute V shape. 
The type of the species is the specimen showing the extended last 
whorl figured in this paper, Pl. vii, Fig. 1. 
According to my estimate this specimen must have had at least 
five complete whorls. The diameter of the coiled part was proba- 
bly about 118 mm., and this is estimated to contain nearly five 
volutions, the length of the free part was over 115 mm. measured 
along the median lateral line, along the dorsal line of this mould 
of the outer whorl it could be measured more readily as 105 mm. 
