232 G. LINDSTKOM, ON THE SILURIAN GASTROPODA AND PTEROEODA OF GOTLAND. 



Plate XIII. 



Fig. 1. Murchisonia cancellata n., p. 133. 



» 2 — 3. » cochleata n., p. 134. 



» 4 — 5. » tortuosa n., p. 132. 



1) 6. » munda ns, p. 132. 



» 7 — 12. i> imbricata n., p. 133. Fig. 7 slender, finely striated varietj^; 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 shale 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 the apical side; middle figure, section of the edge, 

 uppermost 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 

 Wiingsgardet in Dalecarlia. 



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

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

 apex of which is filled with organic deposit; fig. 30 — 31 from W^estergarn. 



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



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



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



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

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

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



