371 
of the Veil triculi else of the Chalk. 
Fig. 13. The polyp-cells : vertical section highly magnified, p. 188. 
— H. The mode of addition of fibre, p. 93. 
PI. Vlir. (all in chalk except fig. 7). 
Figs. 4 & 5. Casts showing the places of processes, p. 184. 
— 6. Polyp-cells highly magnified, p. 187. 
— 7. Root-fibre encrusted with chalcedony, p. 97. 
— 1. Ventricidites simplex, ^.20'^. 
— 2 & 3. Ventriculites impressus, p. 205. 
N.B. For Ventriculites quincimcialis see PI. VII. fig. 7, & p. 207. 
PI. XIII. (all in chalk, except fig. 6, which is in flint). 
Fig. 1. Ventriculites muricatus, p. 210. 
— 2. Ventriculites tessellatus, p. 211. 
— 3 4. Diiferent sections of V. tessellatus, p. 21 1 . 
— 5. Ventriculites cavatusy 2\2. ' 
— 6. Ventriculites striatus, Tp.2\2. 
— 7. Ventriculites mammillaris, p. 213. 
N.B. For Ventriculites latiplicatns see fig. D, p. 215. 
— 8. Ventriculites decurrens, p. 215. 
— 9. Variety p. 215. 
— 10. Ventriculites radiatus, \>.2\9>. 
— 11. Section of V. quincuncialis, p. 208. 
— 12. Section of V. muricatus, p. 210. 
— 13. Plaits of V. .striaius, pp. 214, 216. 
— 14. Plaits of V. mammillaris, pp. 214, 216. 
— 15. Plaits of V. radiatus, p. 216. 
N.B. For Ventriculites hicomplientus see fig. E, p. 219. 
PI. XIV. (all in chalk). 
Fig. 1. Cephalites longitudinalis, p. 281. 
— 2. Cephalites guttatus, p. 282. 
— 3. Cephalites paradoaus, p. 283. 
— 4 & 5. Outer and inner surfaces of Cephalites alternans, p. 283. 
— 6. Cephalites bullatus, ^.2d>4. 
— 7. Section of Cephalites bullatus, p. 284. 
— 8. Cephalites retrusus (moulded from a cast in flint), p. 285. 
— 9. Cephalites catenifer, p. 286. 
— 10. Cephalites compressus, p. 287. ' 
— 11. Cephalites capitatus, p. 288. 
— 12. Cephalites campanulalus, p. 289. 
— 13. Vertical section of Cephalites campanulatus, p. 292. 
— 14. Piece of the matrix from inside of C. catenifer, showing projecting 
parts, which filled the depressions in the living animal, broken 
away, p. 286. 
— 15. Transverse section of fold of membrane of C. catenifer, p. 287. 
— 16. Plaits of C. catenifer, p. 287. 
PI. XV. (all in chalk, except fig. 6, which is flint). 
Fig. 1. Cephalites constrictus, p. 292. 
— 2. Cephalites peiforatus, p. 294. 
— 3. Brachiolites tuberosus, p. 354. 
— 4. Brachiolites elegans, p. 355. 
— 5. Brachiolites convoluius. The specimen has been vertically divided 
and one-half cleared out, thus showing the convolutions and the 
interior, p. 355. 
N.B. For Brachiolites angularis see fig. O, p. 357. 
25 * 
