232 G. LINDSTUÖM, ON THE SILURIAN GASTROPODA AND l'TEROPOI)A OF GOTLAND. 



Plate XIII. 



Fig. 1. Murchisonia cancellata n., p. 1.33. 



» 2 — ■ 3. » cochleata n., p. 134. 



» 4 — 5. » tortuosa n., p. 132. 



» 6. " munda n., p. 132. 



» 7 — 12. » imbricata n., p. 133. Fig. 7 slender, finely striated variety; fig. 8 the thicker and 



more coarsely striated, f. 9 — 12 details of aperture, umbilical region and slit band. 



» 13 — 14. Murchisonia tortuosa n., p. 132. 



» 15 — 16. Pleurotomaria qualteriata Schloth., p. 108. Fig. 15 from the sliale of Wisby. Fig. 16 

 ornamentation and slit band in specimen from Lerkaka, Oland. 



» 17 — 18. Pleurotomaria obvallata Wahlenb., p. 108. Fig. 17 section of the shell, f. 18, details of the 

 slit band; lowest figure, slit band on tiie apical side; niiddle figure, section of the edge, 

 upperraost figure, slit band from the umbilical side. From specimens belonging to the 

 Museum of the Geol. Survey of Sweden from the upper gray Orthoceratite Limestone at 

 Wångsgärdet in Dalecarlia. 



>> 19 — 31. Euomphalus Gotlandicus n., p. 139. Fig. 19 — 25 specimens from the shale of Wisby. Fig. 

 26 — 29 evolute specimens from Kyrkberget in Wisby, tlie mucleus lying beside the shell, the 

 apex of which is filled vvith orgauic deposit; fig. 30 — 31 from Westergarn. 



» 32 — 35. EuompJialus triquetrus n., p. 140. 



» 36 — 38. » Ångelini n., p. 138. Lower Silurian from the inferior gray Orthoceratite Limestone 



at Utby, Lindgärden in Dalecarlia, fig. 38 sculpture on the lateral surface. 



» 39 — 44. Pleurotomaria replicata n., p. IIG. Fig. 39 from the aperture, apical side downwards, f. 40 

 from the umbilical side, f. 42 slit band magiiified, interiorly the oblique crescentic lamellae 

 are seen, f. 43 transverse section of slit band, f. 44 slit band along is exteriör edge. 



