52 G. LINDSTRÖM, THE ASCOCERATIDA AND THE LITUITIDA, 
PLATE VI. 
1. Ascoceras cochleatum n. from Wisby. 
2. Ascoceras fistula n. Schematized, represented as complete. 
3. Ascoceras manubrium n.  Ditto. 
4. Ascoceras lagena. Ditto. 
5. Ascoceras decipiens. Ditto. In all these figures the shaded parts signify such portions as have been 
really found, pointed ones as they are supposed to have been. 
Choanoceras mutabile n. 
6—7. Shell, natural size from the convex (6) side and the concave (7). Fig. 6 a. part of the surface 
of the interior stratum magnified. From Samsugn in Othem. 
8. Apex of the same seen from below. ; 
8a. The same magnified to show the shape of the button-like funnel of the septum and the little plug which 
closes the siphuncle. 
9. The shell, natural size, lateral view. 
10. Longitudinal seétion of this specimen. 
10 a. The siphuncle of the section in fig. 10, magnified. 
11. The inferior part of the body chamber hollowed out to show the sutures of the incomplete septa on 
the inside. 
12. Longitudinal section of another specimen from Klints in Othem. 
13. Longitudinal section facing the side where the septa are lacunose. 
14. Likewise, facing the side where the septa are complete. 
15. Longitudinal section from the concave to the convex side, and showing the hollow interior shell with 
outlines of the incomplete septa. 
16. Bottom seen from above, showing the siphuncle and the outlines of the incomplete septa. 
17—19. <"Transverse sections of the specimen fig. 15, 17 corresponding with A., 18 with B., 19 with C. 
