Rl. 2. 



1. riatyccras lachtiosiim. 



„ £-- /'. 



2. /^latyit-ras procii^u-. 



,t, lateral view. 



/■, portion of the stri;t enlarged; three diam. 



a. Platyceras ineiii/'rantuetiin, 



4. Pintaincreiia compressa. 



ii, dorsal side. 



5. Spiri/er asperata, dorsal valve. 



a, inner side of a jiortion of a ventral valve showing the narrow foramen. 

 /), portion of a: enlarged five diam. 



0. Crania, dentata, 



a, dorsal valve enlarged four diam. 



7. Crania gracilis. 



a, dorsal valve enlarged two diam. 



8. Crania pannosa. 



a, profile. 



b, young individual. 



y. Avicula u7idosa, 



10. Conularia niultipuncta. 



a, portion of the surface enlarged ten diam. 



11. Conularia bi/urca. 



a, surface enlarged four diam. 



12. Conularia transversa. 



13. Ceramopora orbiailaia. 



a, enlarged three diam. 



14. Rhinopora curz'ata. 



rt, two rows enlarged three diam. 



15. Sto7)iatopora recta. 



rt, profile of three cells enlarged three diam. 



10, Stoiiiatopora parva. 



17. Chatetes expansus. 



18. Titbercutopora injlata. 



a, end of branch. 



b, enlarged section of cell showing the fibrous envelope. 



