30 G. LINDSTRÖM, THE ASCOCERATIDZE AND THE LITUITIDE. 
though a little thicker than the septa of the Nautiloid. There are four sigmoid septa, 
the constant number in all specimens. They are elongated and narrow. The siphuncle 
is still in direct communication with the narrow siphuncular tube of the Nautiloid in the 
best preserved specimen and it consists of the common elements, placed nearer the central 
axis of the shell, than in most others of this genus. 
From the limestone of Lummelund there has been found a specimen with an un- 
commonly long neck (pl. IV f. 25), making two thirds of the remaining part of the shell. 
The four sigmoid septa are larger than in ÅA. lagena, with which it seems to be nearly 
related. It is indistinctly transversally striated. 
On plate VTI f. 4 there is a restored figure of A. lagena showing it to be one of 
the most curved of all species. 
11. Ascoceras cucumis n. 
Pl. IV fig. 40—47. 
Several specimens of the Ascoceras stage have been found in the superior lime- 
stone of Sandarfve kulle. 
Shell elongated, nearly evenly cylindrical, ventral side regularly arched, the dorsal 
one faintly concave or almost straight. Neck short, not forming an angle against the rest 
of the shell, making about a seventh of the total length. The exterior surface is trans- 
versally and microscopically striated and longitudinally folded by regularly distantiated 
wrinkles. Transverse section oval. 
There are five sigmoid septa, regularly distantiated from each other. The siphuncle 
has, at least in the beginning, a rather central place between the ventral side and the central 
axis of the shell and continues upwards in an oblique direction. Its first element is more 
bulbous than nummuloid. The inferior aperture is closed by somewhat irregular cal- 
. careous concretions. 
Length of the shell 60 millim., dorso-ventral diam. 14 millim., minor diam. 10 millim. 
Near to this species some forms of Ascoceras range, which cannot be described as 
separate species, as there is only a single incomplete specimen of each extant. The speci- 
men figured pl. IV fig. 36—37 from Samsugn in Othem, may be only a variety of this 
species. It is, however, more straight, has only four slightly curved septa and the orna- 
mentation differs a little. 
tesembling Asc. cucumis in exterior shape there is a fragmentary specimen from 
Linde klint (/fiqg:s 38—39), which is most remarkable as it has had no less than twelve 
(12) sigmoid septa, as may be inferred from the remaining fragments. 
12. Ascoceras decipiens n. 
P1; Vf; = d4 0 VER 
This species has been found in the Nautiloid stage as well as in the Ascoceras stage 
in the uppermost limestone of Sandarfve kulle, Linde klint, Duckarfve backe, Mannagårda 
in Lye and Holmshallar in Wamlingbo. 
