EXPLAXATIOX OF PLATES. 



Plate XVII. 



Descriptios of Figueks. 



Fig. page 



6. Vemfuilina polyslropJia (Renss). Normal m^alospheric form, . 171 



9. „ „ „ Normal microspheric form, . 172 



(For figs. 10. 11. see Plate XYL) 



12. Venuuilina j/usilla. Goes. Long form, 173 



13. , „ Short form, 173 



14. r<mi/i(t/iiui /w/ys^ro/iA^i (Beiiss). Young normal individual. Con- 



trast contour and texture with fig. 13. . .174 



15. I V^mfuilina /■oltfstropha (Reusa). Specimens from shore-sand, 



16. j Selsey Bill, Sussex, selecting heavj- mineral grains for building, 174 



1'- j Fenuuilina jolystropha (Reuss>. Normal tank-grown specimens. 



18. I incorporating pern sand, ....... 175 



19. 



•20. 



21. 

 22. 

 23. 



Vemeuilina polyttnpka (Beuss). Abnormal tank-grown specimens. 



incorporating gem splinters, '175 



(For fig. 24, see PUte XVII L) 



VemeuUina polyttropha (Beuss 

 26. J specimens, joined apex to apex, 176 



1 Vemeuilina polyttropha (Beuss). Abnormal tank-grown twinned 



