h "ruminate" or chew the cud.

SARCODE (Gr. _sarx_, flesh; _eidos_, form). The jelly-like substance
of which the bodies of the _Protozoa_ are composed. It is an
albuminous body containing oil-granules, and is sometimes called
"animal protoplasm."

SAURIA (Gr. _saura_, a lizard). Any lizard-like Reptile is often
spoken of as a "Saurian;" but the term is sometimes restricted
to the Crocodiles alone, or to the Crocodiles and Lacertilians.

SAUROPTERYGIA (Gr. _sauro_; _pterux_, wing). An extinct order
of Reptiles, called by Huxley _Plesiosauria_, from the typical
genus _Plesiosaurus_.

SAURURAE (Gr. _saura_; _oura_, tail). The extinct order of Birds
comprising only the _Archoeopteryx_.

SCANSORES (Lat. _scando_, I climb). The order of the Climbing
Birds (Parrots, Woodpeckers, &c.)

SCAPHITES (Lat. _scapha_, a boat). A genus of the _Ammonitidoe_.

SCOLITHUS (Gr. _skolex_, a worm; _lithos_, a stone). The vertical
burrows of sea-worms in rocks.

SCUTA (Lat. _scutum_, a shield). Applied to any shield-like plates;
especially to those which are developed in the integument of
many Reptiles.

SELACHIA or SELACHII (Gr. _selachos_, a cartilaginous fish, probably
a shark). The sub-order of _Elasmobranchii_ comprising the Sharks
and Dog-fishes.

SEPIOSTAIRE. The internal shell of the Sepia, commonly known as
the "cuttle-bone."

SEPTA. Partitions.

SERPENTIFORM. Resembling a serpent in shape.

SERTULARIDA (Lat. _sertum_, a wreath). An order of _Hydrozoa_.

SESSILE (Lat. _sedo_, I sit). Not supported upon a stalk or peduncle;
attached by a base.

SETHAE (Lat. bristles). Bristles or long stiff hairs.

SIGILLARIOIDS (Lat. _sigilla_, little images). A group of extinct
plants of which _Sigillaria_ is the type, so called from the
seal-like markings on the bark.

SILICEOUS (Lat. _silex_, flint). Composed of flint.

SINISTRAL (Lat. _sinistra_, the left hand). Left-handed; applied
to the direction of the spiral in certain shells, which are said
to be "reversed."

SIPHON (Gr. a tube). Applied to the respiratory tubes in the
_Mollusca_; also to other tubes of different functions.

SIPHONIA (Gr. _siphon_, a tube). A genus of fossil Sponges.

SIPHONOSTOMATA (Gr. _siphon_; and _stoma_, mouth). The division
of _Gasteropodous Molluscs_ in which the aperture of the shell
is not "entire," but possesses a notch or tube for the emission
of the respiratory siphon.

SIPHUNCLE (Lat. _siphunculus_, a little tube). The tube whic