238 G. LINDSTKOM, ON THIv SILUlilAN GASTUOPoYwt AND PTKROPODA OF GOTLAND. 



Plate XVI. 



1 — 6. Pycnomphalus aciitus ii., p. 154. From Wialmsudd. 



7. » trochiformis n., p. 154. The original beloiiffs to the Museum of the School of AVisby. 



8 — 10. Trochus undulans n., p. 148. Fig. 8 from Siiiiisugn. Fig. 9 — 10 from Slitc. 

 11 — 13. » ])rofundiis ii., p. 148. This species is probably rather to be considered as an Onustus. 



14 — 19. Oriostonta alatuia n., p. 171. 



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



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 in Hall. 



