399 
WEIGHT, DR. T., 25, 33, 36, 55, 58-60, 
64, 67, 69, 70, 72, 73, 77, 79, 80, 81, 
87, 91, 94, 96, 121, 128, 134, 138, 
141-143, 146, 148-153, 158, 186, 188, 
196, 204, 208, 213, 215, 246, 264-266, 
270, 327. 
Wrington, Vale of, 133. 
Wyinondham, 238, 280, 281. 
Wytham Boring, 230, 269. 
X. 
Xiphoteuthis, 71. 
Y. 
Yart Valley, 72. 
"Yellow Sands," 195, 198. 
Yeovil, 205 207, 255, 256, 258-260, 296, 
298, 309, 315. 
Marble, 84. 
Marsh, 206. 
Stone, 259. 
Yorkshire, Lias of, 21, 23. 
YOUNG, A., 222. 
YOUNG, G., 81. 
z. 
Zinc-blende, 98, 237, 307. 
Zones, Palseontological, 11, 18, 26, 68 
71. 
and stratigraphical divisions, 253. 
of the Lias, 25, 34. 
Zones in the Lower Lias, 36, 57. 
in the Middle Lias, 186. 
in the Upper Lias, 246. 
Zone of Ammonites acutus, 186, '228. 
angulatus, 36, 45, 57. 
annulatus, 180, 223, 246-248 
250, 271, 286. 
armatus, 36, 46, 57. 
bifrons, 246, 286. 
Bucklandi, 36, 45, 57. 
1 capricornus, 36, 49, 57. 
catenatus, 169. 
communis, 246, 252, 271, 286. 
Davoei, 69. 
falcifcr, 246. 
Henleyi, 36, 49, 57. 
heterophyllns, 286. 
Ibex, 36, 46, 57. 
Jamesoni, 36, 46, 57, 160. 
jurensis, 246, 253, 272, 273. 
margaritatus, 186, 191. 
obtusiis, 36, 46, 57. 
opalinus, 246, 253, 273. 
oxynolus, 36, 46, 57. 
planicosta, 46, 84. 
planorbis, 36, 45, 57. 
raricostatus, 36, 46, 57. 
sauzearms, 154. 
semicostalus, 36, 45, 57. 
serpenlinus, 246, 248, 250, 
271, 286. 
spinatus, 186, 191, 193. 
striatulus, 246. 
Turneri , 36, 45, 57. 
Helemnites clavatus, 43. 
Pecten tequivalvis, 193. 
- (See also under Ammonites.) 
