PLATE XIV. 



Orthoceras dolatum, Whidborne. (Page 132.) 



Fig. 



1 . Large specimen of the septal part of an aged shell showing the ornamentation, 



although much weathered, above, and the septa and position of the siphuncle 

 below ; 1 a, diagram of section. Wolborough. Vicary Collection. 



2. Another very finely preserved specimen of the septal part ; 2 a, portion of the 



surface enlarged ; 2 b, longitudinal section polished. Wolborough. Tor- 

 quay Museum. 



3. Fragment of the septal part of a specimen belonging probably to the same 



species. Wolborough. Museum of Practical Geology. 



Orthoceras tubicinella, Sowerby. (Page 134.) 



4. Typical specimen retaining the external coat in a beautiful state of preservation ; 



4 a, diagram of section. Wolborough. Museum of Practical Geology. 



5. Specimen of a young shell ; 5 a, diagram of section. Wolborough. Vicary 



Collection. 



Orthoceras sub-tubioinblla, n. sp. (Page 137.) 



6. Finely preserved specimen of the septal portion of the shell. 6 a, pattern 



enlarged. Wolborough. Torquay Museum. 



Orthoceras sctbannulare, Milnster. (Page 188.) 



7. Very large and fine specimen ; 7 a, portion of surface enlarged. Wolborough. 



Museum of Practical Geology. 



8. A fragment showing the septa on one side, and on the other a portion of the 



outer shell, displaced in position, but in a good though rather peculiar 

 state of preservation. The downward convexity of the septa and the 

 position of the siphuncle are seen below ; 8 a, portion of outer surface en- 

 larged ; 8 b, diagram of section. Wolborough ? My Collection. 



Orthoceras oryx, n. sp. (Page 140.) 



9. Small and worn fragment showing the obliquely arching rings ; 9 a, diagram of 



section ; 9 b, portion of surface enlarged ; 9 c, the same still more enlarged 

 showing the relation of the major and minor transverse ornamentation. 



Orthoceras eutrichdm, Whidborne'^ (Page 122.) 



10. Portion of the body-chamber of a specimen which has lost its external shell; 

 and which is doubtfully referred to this species. Lummaton. My Collec- 

 tion. 



