PLATE 84. 



Fig. 1. 715. 5. Cyclonema sulcata. ( Pag. 347.) 



1 a, b. Two views of a specimen of this shell. 1 c. A small individual. 



1 d. An impression of the base of this shell in limestone. 



Fig. 2. 716. 22. Pletjrotomakia bispikalis. ( Pag. 348.) 



2 a. A cast from the mould fig. 2 6. 2 b. A mould of this speceis, showing four volutions. 



Fig. 3. 717. 23. Pleurotomaria? . (Pag. 348.) 



Fig. 4. 718. 24. Pleurotomaria solarioides. ( Pag. 348.) 



4 a. The hase of a specimen, showing the umbilicus. The outline of the shell is obscured by the adhesion of 

 the surrounding stone. 



4 b. The upper surface of an imperfect specimen. 



Fig. 5. 719. 25. Pleurotomaria perlata. (Pag- 349.) 



5 a. View of the upper surface of an imperfect cast. 5 6. Profile view of the same. 



5 c. Parts of two volutions near the base of the shell. 



Fig 6. 720. 11. Bucania angustata. (Pag. 349.) 



6 a, b. Dorsal and lateral views of the same specimen. 



Fig. 7. 721. 9. Cyrtoceras arcticameratum. ( Pag. 349.) 



7 a. A fragment of a cast, preserving, in a length of two inches, thirty-five septa. 

 7 6. A longitudinal section of another specimen. 



7 c. A fragment of a cast, showing the siphuncle. 



7 d. A transverse section, showing the position of the siphuncle on the dorsal margin. 



