PLATE LXVIII. 



Cristellakia. 



Diaru. Page 



Figure 1. — Cristellaria crepidula, Fichtel and Moll, sp., . x 50 542 



Specimen mounted in Canada balsam; with youngs 

 shells in some of the later chambers. 



2. — Portion of the same, more highly magnified, . x 100 



„ 3, 4. — Cristellaria tncarinella, Eeuss, . . x 50 540 



b, Front peripheral aspect. 



,, 5-9. — Cristellaria siddalliana, Brady, . . x 35 541 



Figs. 5-8. Lateral aspect ; fig. 9, front peripheral aspect. 



,, 10. — Cristellaria cassis, Fichtel and Moll, sp., . x 30 552 



,, 11-16. — Cristellaria variabilis, Eeuss, . . x 50 541 



Figs. 11-15. Lateral aspect of specimens in various stages 

 of growth ; fig. 1 6, oral aspect. 



.. 17,18,20-23. — Cristellaria italica, Defrance, sp., . . x 15-20 544 



Figs. 17, 18. Lateral aspect ; fig. 20, front peripheral aspect : 

 figs. 21-23, oral aspect. 



„ 19. — Cristellaria latifrons,ia.. sp.. (see also PL CXIIL fig. 11), x 20 544 



