248 G. LINDSTHOM, ON TIIK SILUUIAN GAS rUOI'oll A AND I'TEKOI'OIIA OF GOTLAND. 



Plate XXI. 



Fig. 1— 3. 



4—10. 



.. 11—14. 



.. 15—19. 



.. 20—29. 



.30—34. 

 35—38. 

 39—42. 



43—54. 



55—56. 

 57—60. 

 61—65. 

 66. 



Mnrchisonia pai-ado^a n., p. 131. 



Oriostoma nilidissimum n., p. 173. 

 » dispar n., p. 173. 



Trochonema Uirritum ii., p. 181. 



Craspedostoma \elegaiiluluin n., p. 

 27—28 from FoUiiigbo, f. 29 

 left si(\e covered with rock as 



Fig. 4—7 from Sandarfve, f. 8—10 from Follingbo. 



183, f. 20—24 from Sarasugn, f. 25—26 from Slite, f. 

 from Klintelierg. Fig. 23 part of the surface enlarged, the 

 common, the transversal ribs only visible; f. 24 transversal 

 section of the columellar lip, where it is bifid, f. 26 part of the surface; in the inferior 

 figure the lighter, wavy parts between the darker, broken edges of the transverse ribs are 

 formed by calcareous mud on which are seen impressions of the now missing, backwards 

 reflexed edges of the ribs. The upper figure, a longitudinal section of the inferior one, 

 elucidates this, the dark portions being the shell and the curved ribs, their continuation 

 marked by dotted lines, the light mud filling the interspaces. 

 Craspedostoma brevispira n., p. 183. Fig 

 » filistriatiim n., p. 183. 



involutum n., p. 184. 

 bifid as in the other species. 



» glabrum n., p. 184. 



32 surface partly covered by rock, partly free. 

 Fig. 42 transverse section of columella, showing how it is 



Fig. 49 section across the outer lip and partly across the 

 body whorl. The superior branch being the lip, tlie inferior one the shell, the inside of the 

 aperture being to the right. 



Cycloiiema perversum n., p. 180. 



Autodetus calyptratas Schrenk, p. 185, young specimens. 



Onychochilus reticulaUan n., p. 196. 



Cycloiiema sp. iudet. operculum from Westerbys in Ardre, p. 177. 



