KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 23. N:o |2. 25 
The shell seems to have been broken several times during its growth which is indi- 
cated through the irregularity of the transverse stri& in some places. 
Length 30 mm., longest diameter 12 mm., the shorter 8 mm. Breadth of septa 4 mm. 
This species is very characteristic and quite distinct from the preceding species. 
Its longitudinal axis is nearly crescent shaped, in Asc. pupa it is straight, the section is 
ovate, not circular, and, moreover, the ornamentation of the shell is quite different. 
6. Ascoceras bohemicum BARR. 
Pl. III fig. 32—33. 
Syn. 1855 Ascoc. bohemicum Barr. Bull. Soc. Géol. XII p. 74. PI. V, f. 20—28. 
>» 1855 » Ip. N. Jahrb: f. Min. p. 277, pl. 3, f. 1—8. 
> 1867 » ID. Syst. Silur. Bohéme, Vol. II, 1, p. 354. PI. 93, fig. 1—14, pl. 94, f. 28—37, 
plEr967 fig. 46— 49! 
$INI18T7 » Ip. Supplem.; p. 97. P1. 494, fig. 14—215, pl. 513, fig. 14—16. 
» 1888 » LiInDsTRÖM. List of Upp. Sil. Faun. p. 7. 
> 1888 » A. Foorp. Cat. Foss. Cephal. in the Brit. Museum, I, p. 252. 
Distribution. One large, nearly complete specimen and fragments of another from 
Hoburg, in the south chff, in the stratum below the uppermost crinoidal limestone. 
Shell large with elliptic outline, both dorsal and ventral sides convex, the cylindri- 
cal neck bent straight towards the dorsal side. 
The surface is sculptured by crowded, transverse riblets running obliquely on the 
sides and bent downwards on the ventral side. There are 22 of them on a length of 5 
millim:s. They are sharp-edged and the space between them is nearly double their size. 
No longitudinal lines are seen in the weathered specimens. 
There are four sigmoid septa, along the surface so much curved toward the ven- 
tral side, that the fourth attains a breadth of 34 millim:s, the total breadth of the shell 
being 43 mm. The first sigmoid is low and the distance between it and the next is grea- 
ter relatively than in some other species, viz. 17 millim:s, between the second and the 
third 7 millim:s and between the 3d and the 4th three millim:s. 
The specimens do not show the siphuncle nor the septum of the truncature. 
Length 116 millim., breadth 43 millim., lesser diam. 33 millim. 
The Gotland specimens agree in all respects with the descriptions given by BARrR- 
RANDE, at least as to his large specimens. Much smaller specimens sent from Bohemia 
under this denomination scarcely belong to this species. I have not cited Asc. bohemi- 
cum from Prof. BLAKE's work as occurring in England as his figure shows a very badly 
preserved specimen. He says that the specimen has »at least four sigmoid septa», but the 
figure shows only two and of these the first has no homology in unquestionable specimens of 
Asc. bohemicum, and he himself, moreover, doubts whether the specimen belongs to this species. 
7. Ascoceras manubrium n. 
P1; II. (all figures), pl: III fig: 1—8, 13—31, pl. VI fig: 3. 
Distribution. Sandarfve kulle, Linde klint, Mannagårda in Lye, the shore of Ferese 
at Östergarn in a detached stone probably from the stratum d., in the first localities from 
the uppermost stratum. 
K. Sv. Vet. Akad. Handl. Band. 23. N:o 12. 4 
