230 G. LINDSTROM. ON THE SILUHIAN GASTROPODA AND PTICROPODA OF GOTLAND. 



Plate XII. 



Fig. 1 — 3. Pleurotomaria cirrhosa n., p. 121, specimen from Ostei{>;arn, with details of surface. 



» 4. Murchiaonia cava n., p. 128, from Martebo and details of the slit baud. 



n 5 — 6. » moniliformis n., p. 128, from the sandstone of Bursvik. 



« 7. » obtusangula n., p. 128. 



B 8. » subplicata n., p. 129. 



i> 9 — 10. » cingulata His. p. 127, f. 9 the type specimen of Hisinger, which he delineated 



in »LethiEa Sueciea» on pi. XI fig. 6 a. In natural size. 



» 11 — 12. Murcliisonia obtusangula n., p. 128. 



» 13 — 14. » crispa n., p. 131. 



» 15 — 19. " compressa n., p. 129. Fig. 15, nucleus with traces of sculpture, fig. 17 one 



of the largest nuclei with an obtuse end above the filled up apex, fig. 18 longitudinal 

 section along the median axis, fig. 19 transverse section of the apex, showing the dark 

 apical whorls, filled with organic deposit, and the lighter nucleus of the younger whorls. 



» 20 — 24. Murcliisonia attenuata Hisingek p. 130. 



