PLATE 42. 



Fig. 1, 3. 2b2. 3. Cyrtocebas macrostomuh. (^^8- 194.) 



1 a. A I'ragment, showing a partial section. 

 1 6. A large Tragment, showing Uie wide outer chamber. 

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



3 a. Dorsal view of a fragment probably identical : the striae in the figure do not bend so abruptly as in the 

 original. 3 b. Lateral view of the same. 



Fig. 2, 3. 253. 4. Cyrtoceras constrictosteiatum. (Pa^g- 195.) 



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



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



3 e. A fragment, showing the surface markings. 



3 d. Section of the same, which does not show the siphuncle. 



Fig. 4. 254. 5. Cyrtoceras multicamebatum. (P*g. 195.) 



Fig. 5. 255. 6. Cyrtoceras ARcuATtru. (Pag- 196.) 



5 a. Lateral view of the specimen, which is crushed towards the lower extremity. 



5 b. Section of the same. 



5 e. The base of a parasitic coral, or of a crinoid, attached to the fossil. 



Fig. 6. 256. 7. Cyrtoceras camurum. (Pag- 196.) 



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



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



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



7 e. Transverse section, showing the central position of the siphuncle. 



Fig. 8. 259. 12. Orthoceras teeetiforme. (Pag. 198.) 



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

 S b. Section showing the position of the siphuncle. 



