GLOSSARY 



439 



SEPTARIA, lat., septum, a division. 



SEPTARIA, nodules of clay, having 

 their crevices filled with spar, and 

 frequently with some' organic sub- 

 stance, as a nucleus, in the centre. 



SERPENTINE, a rock, the name of 

 which is derived from its stripes 

 and markings frequently resem- 

 bling the skin of a serpent. In 

 its normal form it is composed of 

 diallage and magnesia. 



SERPULA, a serpent ; a genus of an- 

 nelida. 



SERRATED, toothed like a saw. 



SERTULARIA, a genus of arborescent 

 corals. 



SHALE or SCHIST, indurated slaty clay. 



SIDEROLITES, lat., sidus, a star. 



SIGARETUS, a genus of gasteropods. 



SILEX, flint. 



SILICA or SILICON, the base of flint. 



SILICEOUS, flinty. 



SILICIFIED, changed to flint. 



SILIQUAHIA, lat., siliqua, a bean-pod; 

 a genus of shells. 



SILT, the comminuted detritus trans- 

 ported by rivers. 



SINTER, a precipitate from mineral 

 springs. 



SOLARIUM, a sun-dial ; a genus of 

 shells. 



SOLEN, a pipe or tube ; a genus of 

 shells. 



SOLENOMYA, allied to solen and mya. 



SPATANGUS, a genus of sea-urchins. 



SPATHOSE, opaque. 



SPHJSRULITES, lat., sphcerula, a little 

 globe ; a genus of shells. 



SPHEROIDAL, obtuse, or having the 

 form of a spheroid. 



SPICULA, sharp-pointed processes. 



SPIROLINITES, lat., spimda. 



SPIRORBIS, a spiral orb. 



SPIRULA, a little spire. 



SPONDYLUS, head of a prickly 

 artichoke; a genus of shells. 



SQUAMOUS, arranged like scales. 

 STALACTITE, the dripping of carbo- 



nate of lime. 

 STALAGMITE, the same substance 



dropped on the earth. 

 STELLULAR, having, star-like forms. 

 STERNAL, relating to the sternum or 



breast-bone. 



STERNUM, the breast-bone. 

 STOMATELLA, a little mouth. 

 STOMATIA, like a mouth. 

 STRATIFIED, deposited in layers or 



strata. 



STRATUM, a layer of any deposit. 

 STRIKE, the direction or line of 



bearing of strata, which is always 



at right angles to the dip. 

 STROMBUS, a sort of shell-fish ; a ge- 



nus of shells. 



STRUTHIOLARIA, an ostrich. 

 STUFAS, volcanic vents emitting 



gases and vapours. 

 SUCCINEA, amber-coloured. 

 SYENITE, a variety of granite, in 



which hornblende supplies the 



place of mica ; so named from the 



city of Syene in Egypt, where it 



occurs. 



SYMPHINOTA, united at the back. 

 SYNCLINAL Axis, the reverse of anti- 



clinal, the point at which the 



strata converge towards each 



other. 



T. 



TELLENIDES, like tellina. 

 TELLINA, the name of a swift fish. 

 TENTACULA, feelers. 

 TEREBELLA, a little auger. 

 TEREBELLUM, a little auger. 



TEREDINA, resembling teredo. 

 TEREDO, a worm that bores wood. 

 TERTIARY, ancient formations, but 



newer than the chalk. 

 TESTACEA, molluscous animals, as 



snails and whelks, scallops and 



