KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. K:0 6. 161 



Skciiea funata 1828. Fleming Brit. Anim., 314. 



Delphimila subsulcata 1829. His. Tableau ed. 1, 10. 



1831. Id. Anteckn. V, 114, tab. I f. bb. 



1831. Id. Tabl. ed. 2, 8. 



Euomphalus suhsulcatus 1837. His. Leth., 37, tab XI fig. 10. 



1840. Id. Förteokn. 55. 



1867. LiNDSTR. Noraina, 23. 



Straparollus suhsidcalas 1850. D'Orb. Prodr., 30. 



Turbo funatus 1850. Id. Ibid. 30. 



Shell moderately elongated, globular, with six ventricose whorls. The longitudiiial 

 Carinas vary in a high degree as to their number, size and ornamentation according 

 to the different localities and to the size of the specimens. On the bodj^ whorl there 

 may be as many as 14, of which those on the apical side are the largest. As a rule 

 it holds good that each alternate keel is of the same size, one more narrow, sometimes 

 scarcelj' perceptible, being sitiiated between a larger one. Each keel is composed by 

 a succession of imbricated, more or less crowded folds, which at the outer lip have 

 the aspect of shallow notc.hes. The smaller longitudinal stria; are thread fine, seldom 

 imbricated. Sometimes there are two of equal size beside each other. In young spe- 

 cimens the keels are smooth, not imbricated. The interspaces are crossed by träns- 

 verse lines, fine and coarse. In a variety from Hararaarudd in Kräklingbo the keels 

 are low and sharp and the lines of growth continue more sharply defined than in the 

 typical forms, at regular distances. The same variety also occurs in Fårö. 



The aperture is circular, the lips are thin, the umbilicus is very narrow but 

 deep and confined within a sharp and prominent keel, outside Avhieh there is one still 

 larger, with a broad groove, scooped out between them. In several specimens the na- 

 creous lustre is still preserved on the nucleus, where the shell has peeled off. H. 37 

 milL, br. 53 inill. 



The operculum, which has been found in situ in some instances, is disciform and 

 of a perfectly circular outline. See fig. 24. Its inner surface is bordered by an ele- 

 vated, narrow edge, section magnified pl. XVII f. 25. Inside this edge the smooth sur- 

 face is more or less excavated near the centre, for the rest it is flat. The exteriör 

 surface is more or less elevated near the centre in an obtuse top, having, when seen 

 from the side, a faintly concave outline. The different relations in size may be found 

 from the following dimensions. Operculum from Westergarn: height 4 mill., diameter 

 13 mill. Operculum from the hill of Sandarfve: h. 4 mill. diamet. 14 mill. 



In the sculpture of the spiral lines they all nearly agree with those figured on 

 pl. XVII fig. 25 and pl. XVIII f. 24. These are very tightly wound and their spi- 

 rality is evident only by following one of them, else they look as if concenti'ic. They 

 are at least twenty whorls. The surface of these coils is obliquely crossed by a great 

 number of smaller, also elevated lines or coils; the uppermost are highest and more 

 prominent, the others decreasing regularly. This peculiar ornamentation is best shown 

 in thin sections, enlarged under the microscope as seen in the figure 24 pl. XVIII. It 

 is then evident that the spiral coils form narrow ridges, which are nearly vertical to 

 the diameter of the operculum and that the ornamental lines are most numerous on 

 the lower surface of the coil, the uppermost being largest and more wide apart. As 



K. Sv. Vct.-Akad. Handl. Bd. 19. N:o 6. 21 



