405 
The incompiete living chamber occupied 75 mm. of this free part 
as measured above the median lateral line from the broken edge to 
the imperfect remnant of the septal floor. 
The transverse diameter of the termination of the third whorl 
was 15 mm. without the shell, the breadth of the side 10 mm., the 
ventro-dorsal diameter in the mesal plane, as estimated, was of 
about the same length. The transverse diameter about the middle 
of the last quarter of the fourth whorl was 22 mm., the ventro- 
dorsal in the mesal plane was 17 mm. both without the shell. 
The shape of the living chamber must have been greatly altered 
near its termination. The fragment of mould of one side and part 
of the dorsum preserved shows that the impressed zone had become 
narrowed and disappeared completely. The dorsum remained 
slightly flattened, but this flattening given in the restored section, 
Fig. 3, Pl. vii, is probably greater than it was in the fossil. The 
lines of growth on the dorsum of the first part of the free living 
chamber have such a faint sinus that they would ordinarily be de- 
scribed as straight, the lateral crests are much reduced, the ventral 
sinus was not visible, but it also probably became reduced or 
shallower. ‘The transverse diameters were also much reduced, and 
aspect of the aperture changes so that the ventro-dorsal diameter is 
much longer than the transverse. The outline given may be de- 
fective in making this diameter somewhat too long and the abdomen 
not quite flat enough, but certainly there is an entire change in the 
proportions of the whorl and an approximation to this reconstructed 
outline. 
The sutures do not differ materially, if at all from those of 
Saemanni so rar as could be seen. They are visible on the third 
whorl and had the usual curvatures. The two last on the fifth whorl 
were visible on the dorsum and partly on the side. These had a 
deep dorsal lobe, with saddles and lateral lobe as in Saemannz, and 
were very interesting, since they showed that the dorsal sutures had 
not been immediately affected by separation of the whorls. The 
last suture is given in Fig. 1, on Pl, vii. 
The zone of impression is fainter, but still perceptible in the dor- 
sum of the first part of the living chamber, but has entirely disap- 
peared on the latter part of the same. It is more strongly marked 
on the dorsum of the third and early part of the fourth whorls than 
on the latter part of the fourth, but it is broad and still quite dis- 
PROC. AMER. PHILOS. SOC. XxxII, 148. 3G. PRINTED JUNE 28, 1894. 
