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. 
Pleurotomaria bispiralis. 
(Pag. 348.) 
2 a. A cast from the mould fig. 2 b. 
2 6. 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 base 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 b. 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 b. 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. 
