104 G. IJNDSTROM, on TIIIC .Sir.UIUAN GASTKOl'ODA AND I'TEROPODA OF GOTLAND. 



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

 Above the slit hand some faint longitudinal stnvs 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. Tlie 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 eonsecpiently difficult to get 

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

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

 ture 30 mill. 



Sev(!ral specimens have been obtained from the shale beds of Djupvik in Eksta, 

 and Pctesvik in Habl)lingb6. 



17. Pleurotomaria robusta var. Isevissima n. 



PI. VIII %. 8—9. 



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

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

 ridge 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 striae. The suture is shallow. The aperture 

 is circular, the interior lip thin, reflexed around the umbilicus which is narrow and 

 open. H(;ight 17 millim., breadth 19 millim., height of aperture 11 millim. 



Found in the shale of Djupvik in Eksta. 



18. Pleurotomaria elliptica His. 



Trnrlnis dl/jiliriiti 



1829. 

 18.31. 

 1831. 

 1837. 

 1841. 



1813. 



1848. 



1840. 



1842. 



1840. 



IS-fiS. 



1867. 



1870. 



1880. 

 Pleurotdinnriii fnitigvixximn 18ljn. 

 Pleurolomarin siihconim ISO.'j. 

 Flemingia elUptica 1882. 



Tiir/io ciiitii/iiisiimns 



TkvIio rlliplicJia 

 riciivotoiadvia elliptiiyi 



PI. Vin lig. 10-^14. 



HfsiNGER Tabl. ed. 1, 11. 



Id. Anteckn. V, u, tab. 2 lit;. 2, 2, 2, 



Id. Tabl. u\. 2, 9. 



Id. Lcth. 35, tab. 11 fig. 1 a— b. 



Id. Forteckninj^ ofver en geogiiostisk ocli jiptiifikatsiimling IVAii Sverige 



och Norrige, 01. 

 PoiiTLOCK Geol. Rep. Londonderrv, 414, pi. 31 f. 1, very doiiliHiil. 

 Pkonn Nomenclator, 1300. 

 KiciiWAi.D Sil. Sohichtensyst. Estlands, 119. 



In. Urwclt Riisslaiids, 2, .""jS, tab. 2 f. 7. 



In. Bullet. Moseoti. XIX, 104. 



FiUEUR. Schmidt Siluifonii. Esllilaiuls, 203. 



TouNQUisT Lagerloljdeii i Dalanies Undcrsiluriska bililiiiiigar, 19. 

 P'kiid. Roemek Letli. geogn. 4 E<l. Atlas, 1 Till. pi. .'), f. 3. 

 ANOELrN & LiKi)STR()M Fi'agmenta siliirica, 13, tab XV, fig. 8. 

 KifuiWAi.D Lctli. Hossica I, ir, 1108, pi. 42 f. 17 a b. 

 KjKiiui.i'' (iipe IIai.i.) Veiviser 7, fig. 1.5. 

 1)e Koninck Faime II, pt. 3, 94. 



