PLATE XII. 



Gyeoceras aematdm, Phillips, sp. (Page 99.) 

 Fig. 



1. Side view of Phillips' original specimen ; 1 a, ventral view showing the remains 



of two specimens of Davldsonia Verneuilii, Bouchard, upon its surface. 

 Wolborough. Museum of Practical Geology. 



Gyeoceras Leei, WJiidhorne. (Page 101.) 



2. Large specimen showing the external ornamentation and foliaceous appendages 



upon the higher part but only the outline of an oblique section of the shell 

 below ; 2 a, outline of an oblique section of the shell as seen upon the other 

 side of the slab which is polished. Lummaton. British Museum. 



Ctetoceeas difficile, n. sp. (Page 106.) 



3. Side view of a specimen retaining the external ornament; 3 a, ventral view. 



Wolborough. Vicary Collection. 



Cyetoceras, n. sp. (Page 107.) 



4. Side view of a specimen retaining shell but showing no signs of ornament. 



Wolborough. Museum of Practical Geology. 



Oethoceras cf. 0. acuminatum, Eichwald. (Page 152.) 



5. Large specimen of a portion of the body-chamber retaining some portions of 



the shell but showing no signs of ornament. Lummaton. My Collection. 



6. Lateral view of another specimen, consisting of part of the body-chamber and 



of the uppermost septal chamber and showing the obliquity of the septa. 

 Lummaton. My Collection. 



7. Diagram of section of another specimen showing the siphuncle. Lummaton. 



Woodwardian Museum. 



AcTiNOCEEAS DEVONiCANS, u. sp. (Page 120.) 



8. Specimen seen from below showing the siphuncle and the casts of the organic 



depositions of the mantle ; 8 a, lateral view showing the rotundity and 

 obliquity of the septa. 



