PLATE i± 



Fig. 1, 3. 2b2. 3. Cyrtoceras macrostoivhtm. (P^g- 194.) 



1 a. A fragment, showing a partial section. 

 1 i. A large fragment, showing the wide outjer chamber. 

 1 c. Section of the smaller extremity of the last. 



3 ft. Dorsal view of a fragment ]irohably identical : tlie sti'ive in tlie tigure do not bend so abruptly as in tile 

 original. -3 b. Lateral view of the same. 



Fig. 2, 3. 253. 4. Cyrtoceras constrictostriatum. (P^g- 195.) 



2 a. A fragment, showing several of tlie septa and a part of the outer chamber. 



2 4. Transverse section, somewhat compressed, showing the position of the siphuncle. 



3 e. A fragment, showing the surface markings. 



3 d. Section of the same, wliich does not show the sipliuncle. 



Fig. 4. 254. 5. Cyrtoceras MULTicAMERATnM. (Pig- 195.) 



Fig. 5. 255. 6. Cyrtoceras arcuatum. (P^g- 196.) 



3 a. Lateral view of the specimen, which is cruslied towards tlie lower extremity. 

 5 b. Section of the same. 

 5 c. The base of a parasitic coral, or of a crinoid, attached to the lossil. 



Fig. 6. 256. 7. Cyrtoceras cAMtrRUM. (Pag. 196.) 



Fig. 7. 258. 11. Orthoceras arctjolibatum. (Pag. 198.) 



7 a. A fragment near the apex of the shell. 



7 A. A fragment of larger diameter, showing the convexity of a septum. 



7 c. Transverse section, sliowing the central position of the siphuncle. 



Fig. 8. 259. 12. Orthoceras teretiforme. (Pag- 198.) 



S a. Fragments of two specimens connected by tlie dotted lines. The annulations are represented too broad. 

 s b. .Section showing the position of the siphuncle. 



