238 G. LINDSTRÖM, ON TUK 8ILUKIAN GASTROPODA AND PTEKOrODA OF GOTLAND. 



Plate XVI. 



¥ig. 1 — 6. Pijcnomphalus acuius n., p. 154. From Wialmsudd. 

 )) 7. i> trocliiformis n., p. 154. The original boloiigs to the Museum of the School of Wisby. 



» 8 — 10. Trochus undulans n., p. 148. Fig. 8 from Samsugii. Fig. 9 — 10 from Slite. 

 » 11 — 13. » profiindtis n., p. 148. Tliis species is probably ratlier to be considered as an Onustus. 



» 14 — 19. Oriostoma alatum n., p. 171. 

 » 20 — 36. » discors Sow., p. 157. Fig. 20 — 28 from Westergarn, f. 29 from Fårö, Lutterliorn, 



f. 30 from Kyrkberget in Wisby, f. 31 from the canal in Hall, f. 32 — 33 from Kyrkberget 



in Wisby, f. 34 — 36 from the canal iii Hall. 



