PI. ±. 



I. Platyceras laciniosum. 



- /: 



v>. Platyceras proclive. 



a, lateral view. 



/>, portion of the stria.- enlarged; three diam. 



3. Platyceras membraitaeeutn. 



4. Pentamerella compressa. 



(!, dorsal side. 



5. Spirifer asperata, dorsal valve. 



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

 />, portion of a; enlarged five diam. 



6. 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. 



9. Avicula undosa. 



10. Conularia tnultipuncta. 



a, portion of the surface enlarged ten diam. 



II. Conularia bi/urca. 



a, surface enlarged four diam. 



12. Conularia transversa. 



13. Ceramopora orbiculata . 



a, enlarged three diam 



14. Rhinopora curvata. 



a, two rows enlarged three diam. 



15. Stomatopora recta. 



a. profile of three cells enlarged three diam. 



16. Stomatopora parva. 



17. Chatetes expansus. 



18. Tubercutopora inflata. 



a, end of branch. 



b, enlarged section of cell showing the fibrous envelope. 



