PLATE X. 



Cyrtoceras quindecimale, Phillips. (Page 102.) 

 Fib. 



1. Ventral view of a specimen showing the longitudinal and transverse ornamen- 



tation and the ventral sinus ; 1 a, lateral view ; I b, diagram of section. 

 Wolborough? Torquay Museum. 



2. Oblique view of a specimen supposed to be one of Phillips' type fossils, in 



which the ornamentation is of a rather finer character. Wolborough. 

 Museum of Practical Geology. 



Cyrtoceras fimbriatum, Phillips. (Page 104.) 



3. Lateral view of a worn and doubtful specimen showing the asymmetry and 



the septa at the apical end ; 3 a, diagram of section showing the position 

 of the siphuncle. Wolborough. Museum of Practical Geology. 



4. Ventral view of a specimen showing the longitudinal and transverse ornamen- 



tation and the ventral sinus ; 4 a, diagram of section showing the position 

 of the siphuncle. Wolborough. Torquay Museum. 



Gyroceras tredeoimale, Phillips, sp. (Page 96.) 



5. Ventral view of Phillips' original specimen ; 5 a, lateral view ; 5 b, diagram 



of section. Wolborough. Museum of Practical Geology. 



6. Ventral view of the oral portion of a very large specimen. Lummaton. 



Torquay Museum. 



7. Apical portion of another specimen. Lummaton. My Collection. 



Gyrooeras Bipelense, D'Arch. and de Vern., sp. (Page 97.) 



8. Ventral view of a fragmentary specimen. Wolborough. Museum of Practical 



Geology. 



9. Lateral view of another specimen ; 9 a, dorsal view showing the numerous 



longitudinal ribs; 9 b, diagram of section showing the position of the 

 siphuncle. Wolborough. Torquay Museum. 



Cyrtoceras Criokii, n. sp. (Page 99.) 



10. Ventral view of a specimen showing the longitudinal ribs and the frequent 

 and regular transverse fimbriae. Wolborough. Museum of Practical 

 Geology. 



