94 G. LINDSTKÖM, ON THE ylLURIAN GASTKOPuDA AND PTEKOPODA OF GOTLAND. 



3. 



Pl. 



Liuimrssoni ii. 



4. 



Pl. 



voluta 11. 



5. 



Pl. 



claiistrata n. 



6. 



Pl. 



glaiidiforiuis n 



7. 



Pl. 



biformis. 



8. 



Pl. 



latezonata. 



9. 



Pl. 



Hindei n. 



10. 



Pl. 



Helmi ri. 



11. 



Pl. 



Wisbyensis. 



II. ORISP-iE. Slit band with distantiated, sharpedged, regular crcscents and smooth 

 intcrstices. Shell ornamented by niany kuels. 



12. Pl. Lloydii Sow. 



13. Pl. doliuui n. 



14. Pl. laqueata n. 



15. Pl. tubulosa n. 



III. FASTIGIAT.^. Slit band forming a blunt, elevated ridge, crescents flat, oblique, 



densely packed; shell linely striated transversally. 



16. Pl. robusta n. 



17. Pl. la^vissima n. 



18. Pl. elliptica His. 



19. Pl. bicincta Hall. 



20. Pl. qualteriata Schloth. 



IV. SIMPLICES. Slit band narrovv, plain, with small, regular crescents, shell sur- 



face simply, transversally striated. 



21. Pl. valida n. 



22. Pl. Othemensis n. 



23. Pl. comata n. 



24. Pl. asquilatera Wahlenberg. 



V. INOISJE. Slit band with large, lameliar crescents which are divided in their 



luiddle. Shell richly ornamented. 



25. Pl. labrosa Hall. 



26. Pl. limata noin. nov. 



VI. ALAT^. Slit band forming a large, thinedged keel all around the shell, both the 

 bordering lines of the slit band being widened and having developed into thin 

 lamellaä, which have coalesced with their edges enclosing the crescents of growth. 



27. Pl. replicata n. 



28. Pl. alata Wahlenberg. 



29. Pl. alata, var. subcarinata n. 



30. Pl. alata, var. opposita n. 



