PLATE II. 



Fig. 



1. Memhranipora tuberculata, p. 30. 



a. Portion with the tubercles distinct, magnified 25 diameters. 



b. Ditto magnified 50 diameters. 



c. Portion with the tubercles worn offer absent, magnified 25 diameters. 



d. Ditto magnified 50 diameters. 



2. M. monostachys, p. 31 ; magnified 25 diameters. 



3. M. oblonga, p. 34. 



a, a' , a". Magnified 25 diameters. 

 b' b'. Magnified 50 diameters. 



4. M. bidens, p. 34. 



a, c, e. Magnified 25 diameters. 

 h, d. Magnified 50 diameters. 



5. M. andegavensis, p. 34. 



a. Magnified 25 diameters. 



b. Magnified 50 diameters. 



6. M. Savartii, p. 31. 



a. Magnified 25 diameters. 



b. Magnified 50 diameters. 



7. Biflustra delicatula (older or worn conditi(m), p. 72. 



a. Natural size of fragment. 



b. Portion, magnified 25 diameters. 



c. Longitudinal section. 



d. Horizontal section. 



8. Eschara monilifera (?) (back view of broken fragment). 



9. Membranipora andegavensis (older state). 



c. Front, magnified 25 diameters. 



d. Back of detached portion, magnified 25 (Haineters. 



