Plate 17 



Page 

 Figs. 1-5. Leio^ioccia consianii D'Orhigny, 1850 77 



1. Two fragments, natural size. 

 2, 3. A mammillated specimen, X12 and X25, showing the 

 polygonal orifices and the small mesopores. 



4. Portion of an ovicelled l:)ranch with large mesopores, 



X12. 



5. Surface, Xr2, with large mesopores and showing a cir- 



cular area of mesopores. 

 Lower Cretaceous (Valangian) : Sainte-Croix, Switzer- 

 land. 

 Figs. 6, 7. Clausa crane i, new species 79 



6. Young zoarium, X12, with the peristomes arranged in 



transverse rows. 



7. Same zoarium, X25. Extremity showing tubes of the 



same size and revealing peripheral gemmation. 

 Lower Cretaceous (Aptian) : Faringdon, England. 



Figs. S-11. C/a«sa zom/e?-a, new species 80 



8, 9. Specimens, natural size and several X2. 



10. Young zoarium, y.V2, showing the zones of dactyl- 



ethrae. 



11. Same specimen, X25, illustrating the arrangement 



of dactylethrae around the orifices. 

 Lower Cretaceous (Aptian): Faringdon, England. 

 Figs. 12-15. Leiosoecici proxi ma, new species 79 



12. Zoarial fragments, natural size. 



13. Specimen with convex ovicell, X12. 



14. Specimen with ovicell little convex, X12. 



15. Surface, X25. 



Lower Cretaceous (Yalangian) : Sainte-Croix, Swit- 

 zerland. 

 110 



