INDEX. 3 i 5 



Tremellini, structure, habitat, and fructification of, i. 266 



Trepang, used as food, ii. 184 



Triceratium favus, structure and habitat of, i. 199 



Triceratium genus, structure and habitat of, i. 199 



Trichodesmium erythraeum, structure, habitat, and reproduction of, 



i. 215, 216 



Trichogastres, characters of the group, i. 267 



Trichomanes radicans, or bristle fern, structure and habitat of, i. 361 

 Trichomanineae, characters of the group, i. 345 



characters and habitat of, i. 360, 361 

 Trilobites, structure of, ii. 203 

 Tripe de Eoche, structure of, i. 308 

 Triphragmium dubens, spores of, i. 276 

 Tripoli stone on the Rhine, of what it consists, i. 206 

 Trochus granulatus, structure of, ii. 237, 238 

 Trochus zizyphinus, palate of, ii. 237 

 Truffle, structure and habitat of the, i. 292, 293 



modes of tracing them, i. 293 



the red, of Bath, i. 268 



Trypethelium Sprengelii, pustules and sporidia of, i. 299 

 Tuberacei, characters and habitat of the order, i. 292 

 Tubicola, structure of, ii. 153 



found in all seas, ii. 161 

 Tubipora, characters of the family of, ii. 129 

 Tubipora musica, structure and mode of reproduction of, ii. 130 

 Tubipora purpurea, habitat of, ii. 130 

 Tubularia, form and structure of the family, ii. 91 



mode of propagation of, ii. 91 



Tulip, structure and mode of reproduction of, i. 388 

 Tunicata, or Ascidians, characters of. ii. 222 



groups of, ii. 222, et seq. 

 Turbellariae, structure of the, ii. 148 

 Turkey red, from what obtained, i. 124 

 Turpentine, oil of, takes fire in chlorine gas, i. 19 

 Turritopsis nutricula, larvae of the Canina octonaria parasites of, ii. 100 



U 



Ulra, structure and reproduction of, i. 171, 225 



Ulva bullosa, reproduction of, i. 227 



Ulva lactuca, structure and mode of reproduction of, i. 226 



