104 G. LINDSTRÖM, ON TIIK SILURIAN GASTROPODA AND l^TEROPODA OF GOTLAND. 



scents are thickly set, oblique, with theii' largest bend coinciding with the median ridge. 

 Above the slit band soine faint longitudinal strite are seen, intersected by distantiated, 

 transverse ones. Beneath the band there runs an angular keel. The surface is for 

 the rest almost glossy and shining. The suture is deep. The aperture is large, trans- 

 verse, the columellar lip is thick, strongly reflexed and nearly hiding the opening of 

 the umbilicus, which continues in an oblique direction inwards. 



The specimens are generally much worn or obscured by corrosion and by for- 

 eign bodies, which have grown on the surface and it is consequently difficult to get 

 a clear idea of its appearance. On the nucleus the impression of the slit band forms 

 an angular, projecting keel. Height 55 millim., breadth at the base 55 millim., aper- 

 ture 30 mill. 



Several specimens have been obtained from the shale beds of Djupvik in Eksta, 

 and Petesvik in Habblingbo. 



17. Pleurotomaria robusta var. laevissima n. 



Pl. VIII %. 8—9. 



Shell globular, with six whorls, slit band placed exactly on the middle of the 

 whorl, ornamented with the most delicate crescents and moreover with a narrow 

 ridffe more median than in the former. The band is for the rest, not so much 

 angularly elevated, rather square cut, as seen in the section. The surface on both 

 sides of the band is smooth and glossy, with only few obscure spiral bands and with 

 scarcely perceptible, transverse sinuous strioj. The suture is shallow. The aperture 

 is circular, the interiör lip thin, reflexed around the timbilicus which is narrow and 

 open. Height 17 millim., breadth 19 millim., height of aperture 11 millim. 



Found in the shale of Djupvik in Eksta. 



Trochus ellipticus 



Turbo aiiticjnissmus 



Turbo ellipticus 

 Pleurotomaria elliptica 



Pleurotomaria nntiquissim a 

 Pleurotomaria subconica 

 Flemingia elliptica 



18. Pleurotomaria elliptica His. 



Pl. VIII fig. 10—14. 



1829. HrsiNGER Tabl. ed. 1, 11. 



18.31. II). Anteokn. V, ii, tab. 2 fig. 2, 2, 2, 



1831. Id. Tabl. ed. 2, 9. 



1837. Id. Leth. 35, tab. 11 fig. 1 a— b. 



1841. Id. Förteckning öfver en geognostisk ocli petrifikatsaraling från Sverige 



och Norrige, 61. 



1843. Portlock Geol. Rep. Londonderry, 414, pl. 31 f. 1, very doubtful. 



1848. Bronn Nomenclator, 1300. 



1840. EiciiWALD Sil. Schichtensyst. Estlands, 119. 



1842. Id. Urwelt Russlands, 2, .53, tab. 2 f. 7. 

 1846. In. Bullet. Moscou, XIX, 104. 



1858. Fbiede. Schmidt Siltirform. Estlilands, 203. 



1867. TÖRNQUIST Lagevföljden i Dalarnes Undersiluriska bildningar, 19. 



1876. Ferd. Roemer Leth. geogn. 4 Ed. Atlas, 1 Thl. pl. 5, f. 3. 



1880. Angelin &■ Lindström Fragraenta sihirica, 13, tab, XV, fig. 8. 



1860. EicHWALD Leth. Rossica I, ii, 1168, pl. 42 f. 17 a b. 



1865. Kjerulf (nec Hall) Veiviser 7, fig. 15. 



1882. De Koninck Faune II, pt. 3, 94. 



