10. 
CE. 
18. 
19. 
20. 
21. 
22. 
23. 
24. 
DD 
6 
2» 
PETAR 
All the figures of this and the other plates are in natural size, unless they are otherwise signed on the plates. 
Ascoceras cochleatum n. 
from the end. 
Asecoc. dolium n. one of the two specimens 
Aseceoc. cochl 
» 
2 
> 
found, showing the sigmoid septa. 
the largest specimen from the side 
and with details of ornamentation. 
from the dorsal side, nat. size. 
from the truncation, showing the 
siphuncle. 
section showing the septa. The 
first and second sigmoid septum 
do not join. 
eatum n. 
» Longitudinal section of thesame. 
» A fragment of the ventral part 
of the cast. 
» The same, lateral view. 
Ascoc. flstula n. specimen from Samsugn in 
» 
Othem. 
Longitudinal section of the same. 
Neck magnified. 
Another specimen, dorsal view. 
End laterally. 
Septum of the truncature with 
siphuncle. 
Small slab of limestone with 
twenty one more or less perfect 
specimens, collected by Professor 
P. T. CLEVE in the uppermost 
limestone of Slite and now in 
the Museum of the University 
of Upsala. 
Longitudinal section of a speci- 
men with a fragment of the 
Nautiloid in the aperture. 
Longit. section of another spe- 
cimen and a, the end thereof 
magnified. 
Section near the truncature. 
Nucleus with the sutures of the 
enclosed septa: the ventral side 
has been obliquely sectioned. 
Longitudinal section of the same 
specimen along an axis directed 
from the dorsal to the ventral 
side, and near it cut rectangu- 
larly to show the aspect of the 
septa from the ventral side. 
Above the three sigmoid septa 
there is a regular septum. 
The same seen from the ventral 
side and represented as if entire, 
to show the aspect of the si- 
phuncele and septa when sectio- 
ned from the ventral side. 
Longitudinal section of another 
specimen a little on the side of the 
siphuncle, having the septa near 
the dorsal side somewhat more 
bulging than ordinarily. In this 
as in the former specimen there 
is an extra septum of common 
Nautiloid type deposited above 
Fig. 25. 
26. 
27. 
39 
G. LINDSTRÖM, THE ASCOCERATIDA AND THE LITUITIDA. 
the youngest or third Ascocera- 
tide septum. In the body cham- 
ber the inferior end of a Nauti- 
loid of probably this same species 
is seen, showing the peculiar, 
aduncate curvature of the apex. 
Ascoc. fistula n. Inferior portion of another 
» 
» 
» 
» 
specimen = sectioned longitudi- 
nally, through the central axis. 
The same sectioned longitudi- 
nally somewhat on the side of 
the central axis. 
Apex of a fragment, where the 
first and second sigmoid septum 
do not meet and consequently 
both are entire. a. Enlarged 
figure of the same. 
Part of Nautiloid, assumed to be- 
long to this species, lateral view. 
The same, ventral view. 
Longitudinal sections of smaller 
fragments of the Nautiloid. Fig. 
32 a, Section of the shell. 
Longitudinal section of an ap- 
parently entire Nautiloid. 
Exterior of the same enlarged. 
Apex of another Nautiloid with 
three transverse sections a, b, c. 
Longitudinal section of a nearly 
similar fragment. 
Section near the circumference. 
Transverse section. 
40. Ascoc. pupa nu. Lateral view of specimen 
41. 
» 
42—43. » 
51. 
52. 
53. 
54. 
» 
» 
» 
from Linde. 
Lateral view and ornamentation 
of shell enlarged, specimen from 
Sandarfve. ; 
Ventral and dorsal view of the 
same specimen from Linde. 
Lateral view of the same speci- 
men, enlarged. 
Specimen from Linde klint. 
» from Sandarfve kulle. 
Longitudinal section and siphuncle 
enlarged. 
Another specimen longitudinally 
sectioned. 
Siphuncele of the same enlarged. 
a. the siphuncele still more en- 
larged. 
Longitudinal section of the same 
specimen between the central axis 
and the circumference. 
The septum of the truncature from 
its inferior surface enlarged and 
the siphunele still more enlarged. 
Specimen from Linde klint. 
Ascoc. reticulatum-n. Specimen from Sand- 
arfve. a. & b., ornamen- 
tation of shell magnified. 
» Transverse section. 
» Longitudinal section. 
» Shell from the ventral side. 
