126 
INDFA'. 
SilHman, Professor, his interpretation of 
the word i)Cf'iiining, ami of the days 
of tlie Mosaic creation, i. 18. 
Silurus, spine of, i. 290. 
Silurian system, its geological place, 
and liistory of its establishment, i. 
627 ; recognition of, on the coirti- 
nent, i. 528 ; divisions of, ii. 104. 
Simple minerals, definition of, 57 1 . 
Siplmncle, structure and functions of in 
nautilus, i. 321 ; arguments from 
fossil portions of, i. 326 — 328. 
Skiddaway island, hones of megathe- 
rium found in, i. 143. 
Sloth, peculiarities in the structure of 
living species, no imperfections, i. 
141 ; adapted to live on trees,!. 142. 
Smyth, Capt., cicperimcntB on Massey’s 
log and bottles sunk in a deep sea, i. 
345. 
Soemmering, Professor, pterodactyle de- 
scribed by, i. 223. 
Soldani, his collection of fossil shells 
in Tuscany, i. 117. 
Solenhofen,ptero<lactyle found at,i.221 , 
223 ; libellula: and other insects 
found at, i. 221 ; fossil fishes of, i.266 ; 
fossil crustaceans from, i. 387. 
Species, changes of indicate changes 
of climate, i. 116. 
Speeton, hamites found at, i. 368. 
Spiders, fossil in Jurassic and tertiary 
strata, i. 406. 
Spin.ax acaulhius, horny dorsal spine 
of, i. 290. 
Spirula, derived from a sepia, i. 362, 
316; ii. 63. 
Springs, how supplied by stratified 
rocks, i. 70 ; origin and importance 
of, i. 556, 561 ; ordinary supply of 
rivers by, i. 558 ; causes of their 
production, i. 558 ; supply from rain 
water, i. 559, 570 ; systems of, near 
Bath, i. 560; produced in Derby- 
shire, by faults, i. 560 ; two systems 
of, originating in faults, i. 560 ; local 
causes of irregularities in, 569. 
Squaloids, extent of, 287. 
Stark, Dr., on changes of colour in 
fishes, i. 209. 
Star fish, number of ossicula in, i. 441. 
Steam power, prodigious effect of, i. 
.533 ; amount of, employed in Corn- 
wall and in Kngland, i. 534, 535. 
Stelleridans, geological commencement 
of, i. 41 6 ; structure of fossil, similar 
to that of exisfiiig species, i. 416. 
Steneosaurus genus established by St. 
Hilaire, i. 252. 
Sternberg, Count, his Flore du Monde 
primitif, i. 456 ; on cycadeae and 
zamites in the coal formation, i. 
492 ; his discovery of fossil scorpions, 
i. 406. 
Stigmaria, form and character of, i. 
476, 477 ; dome-shaped trunk, i. 
476 ; internal structure of, i. 477 ; 
probable aquatic habit, i. 478. 
St. Hilaire, Geoffrey de, his new genera 
of fossil crocodilians, i. 252. 
St. Ouen, Arlesian well at, i. 562. 
Stones, none have existed in tlieir pre- 
sent state for ever, i. 572. 
Stonesfield, mixture of marine and ter- 
restrial animals in oolite at, i. l2l ; 
pterodactyle found at, i.221 ; mega- 
losaurus found at, i. 234 ; scales of 
testudinata found at, i. 258 ; cast- 
ings of marine worms at, i. 260 ; re- 
mains of marsupialia found at, i. 265 ; 
rhyncholites found at, i. 319. 
Stratified rocks, aggregate thickness of, 
i. 38. 
Straus, on eyes of insects, &c. i. 
397. 
Sturgeons, functions of living species, 
i. 279. 
Sublimation, theory of veins filled by, i. 
551. 
Succession, eternal, of species disproved 
by phenomena of primary rocks, i. 
54. 
Sumner, Bishop, his records of Creator, 
i. 33. 
Superposition, regular order of in stra- 
ta, i. 6. 
Surturbrand, brown coal of Iceland, i. 
509, 510. 
Syringodendron, name applied to many 
species of sigillaria, i. 472. 
Tankervilie, I.ady, zamia in conscr- 
vatoiyof, i. 494. 
Taylor, Mr. R. C., on fossil fuel in 
Pennsylvania, i. 452. 
Taylor, Mr. I. C., on duty of steam 
engines, i. 532 et seq. ; on beneficial 
disposition of metals, i. 554. 
Tcleosaurus, genus of, established by 
St. Hilaire, i. 252 ; skeleton of from 
Whitby, i. 253. 
Temperature, changes indicated by fos- 
sil vegetables, 453 ; proofs of gra- 
dual diminution of, i. 507. 
Tertiary strata, character of, i. 76 ; 
character of their fossil vegetables, i. 
453. 
Testudo grteca, recent footsteps of, i. 
261. 
Tetragonolepis, fossil species of, i. 124. 
