330 



INDEX, 



Silurian corals, 70, 83 



encrinites, I15, 117, 124, 125 



foraminifera, 31 



fossil mollusca, 245 ; altera- 

 tions in appearance of, 245 ; im- 

 pressions of, 245 ; localities for 

 finding, 246 



fossil worms, 168, 170, 171,172 



graptolites, 38, 48, 49, 52 



sponges, 13 



star-fishes, 138 



trilobites, 189, 192 



Siphonia, 12, 25 



Sorby, Dr., on corals, 64 



Spirifna^ 228 



Spirorbis, 169, 170 



Spongites, 21, 22 



Sponge-flesh [sarcode)^ 6, 8 



Sponge gravels, 26 



Sponges, boring, 13 



calcareous, lo, 14, 16 



Carboniferous, 17 



chitinous, 10 



compound animals, 7 



Cretaceous, 16, 18, 25 



Flint, 20 



Great Oolite, 19 



Greensand, 19, 25, 26 



in Lower Cambrian rocks, 1 1 



in Ludlow rocks, 10 



Kentish Rag, 19 



Portland stone, 19 



Purbeck limestone, 16 



recent, 13, 19 



siliceous, 1 1 



Silurian, 13, 17 



spicules of, 9, 10, 18, 19 



Star-fishes, 130 ; deep sea, 136 



Starkie Gardner on modification of 

 mollusca, 242 



** St. Cuthbert's Beads," 128 



Strophomena, 231 



Stroud, corals near, 93 



Swansea, zaphrentis at, 86 



Tahulata, 58 

 Tentaadites^ 170 



Terehrattilidtc, 228, 234 



Terehrattda has tat a, 234 



grandis, 235 



Tertiary corals, 96 



Crustacea, 206 ; at Sheppey, 



207 



mollusca, 271 ; importance 



of, 271 ; in Thanet sands, 272 ; 

 localities for, 272 



Tetractinellidce, II, 12 



Thamnastrceay 91 



Thecosiiiilia, 93 



Thomson, James, discovery of 

 sponge spicules, 18 ; on corals, 85 



Sir Wyville, encrinites dredged, 



104, 122 



Thunder-bolt, story of a, 298 



Thunder-bolts, 296, 297 



Tortoise-encrinites of Chalk, 112 



Trilobites, 174; folk-lore of, 175; 

 etymology of, 176 ; relations of, 

 176 ; metamorphoses of, 177 ; 

 their relation to king-crabs, 178; 

 resemblance of larva of king-crab 

 to, 178 ; compound eyes of, 180, 

 185 ; sizes of, 181 ; Barrande on 

 larval stages of, 183 ; Owen on 

 sexes in, 184; Buckland on eyes 

 of, 185; bottom feeders, 187; 

 Salter on, 187 ; relations of 

 species of to shrimp, parasite 

 {Bopyrus)^ 188 ; moulting of, 

 189 ; relation to recent scrolls ^ 

 192, 193 ; to recent aptis^ 193 ; 

 localities for finding, 194, 199 ; 

 classification of, 199, 200 



Trigone I lltes, 317 



Tubed worms, 162 



Upper Silurian Brachlopoda, 237 ; 

 localities for, 236 



Ventriculites, 12, 21, 24 



"Venus' flower-basket," 



I, 12, 24 



