_spira_, a spire or coil; _fero_, I carry). An
extinct genus of Brachiopods, with large spiral supports for
the "arms."
SPIRORBIS (Lat. _spira_, a spire; _orbis_, a circle). A genus
of tube-inhabiting Annelides, in which the shelly tube is coiled
into a spiral disc.
SPONGIDA (Gr. _spoggos_, a sponge). The division of _Protozoa_
commonly known as sponges.
STALACTITES (Gr. _stalasso_, I drop). Icicle-like encrustations
and deposits of lime, which hang from the roof of caverns in
limestone.
STALAGMITE (Gr. _stalagma_, a drop). Encrustations of lime formed
on the floor of caverns which are hollowed out of limestone.
STIGMARIA (Gr. _stigma_, a mark made with a pointed instrument).
A genus founded on the roots of various species of _Sigillaria_.
STRATUM (Lat. _stratus_, spread out; or _stratum_, a thing spread
out). A layer of rock.
STROMATOPORA (Gr. _stroma_, a thing spread out; _paras_, a passage
or pore). A Palaeozoic genus of _Protozoa_.
STROPHOHENA (Gr. _strophao_, I twist; _mene_, moon). An extinct
genus of Brachiopods.
SUB-CALCAREOUS. Somewhat calcareous.
SUB-CENTRAL. Nearly central, but not quite.
SUTURE (Lat. _suo_, I sew). The line of junction of two parts
which are immovably connected together. Applied to the line where
the whorls of a univalve shell join one another; also to the lines
made upon the exterior of the shell of a chambered _Cephalopod_
by the margins of the septa.
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