SEX- 
Pert. sex ; appl. reproduction, off. 
—- al (bi ol.). 
sex 11,—an ovum or sperm. 
er ee rphism, — strongly- 
marked differences, in size, colour, 
etc., between male and female of 
one species (zoo/.). 
sexual generation,—-a gamobium 
or medusa. - See alternation of 
[A.S. sceaft, a — - 
A rachis ; the distal part 
of the stem of a feather ; the straight 
cylindrical part of a long bon 
Je 
eset one) n. [A.S. sceth, oe 
od.}| A protective coveri 
Lee an investing ae (bot); : 
an nsect wing-cover (zoo. 
shell (shél) 7. [A.S. scedi, shell. The 
outer cover ing o of animal or 
fruit (d¢o/.) ; a covering, Fibadeons. 
siliceous, bony, horny, or chitinous 
(zool.). 
shell gland, shell sac,—the organ. 
in whose walls material for forming 
shell is created. 
shied (shéld) #. [A.S. scild, a 
4 protecting structure 
su as carapace or lorica 
(wool). 
shoulder — sca 
shoulder —the setae girdle, 
which cansiess of agin coracoid, 
and clavicle (az 
sialoid (si mlsid) a [Gk.  szalon, 
saliva ; ezdos, nde ere Like 
saliva (phys. 
sicula (sik’tla ) m. [L. steula,a small 
r.] A small dagger-shaped 
me 
Feopesty as that By which sateitive 
proteins are normally assimilated 
hys. 
oes thin-walled elongated 
cell of a — tube (dor. 
sieve disc plate, ,—the end walls 
of sieve is  shickeened and modi- 
fie "4 = — sieve-plates (do¢.). 
siev r pore,—a perforation of a 
aw late (do0.). 
291 
SIM- 
sieve tissue,—the ‘essential tissue of 
the phloem of vascular bundles 
sieve tubes or vessels,—long slender 
whe sight.] The 
ssions of out- 
conveyed to the brain 
y nts ns of retina and optic nerves 
sigilate (sijilat) a [L. ségtllum, a 
eal.] Having seal-like markings, 
as certain roots a 
sigma (sig’ma) # [Gk. = ma.] 
A C-shaped sponge spicule fer ). 
sigmaspire (sig’maspir f° 1Gke x, 
sigma ; L. sfzra, a coil.] A sigma 
with an add ies twist (z00/.). 
sigmoid sig’ moid) a. 
ve two directions ; 
appl. arteries, cavities, valves 
— flexure,—an S-shaped — 
urve as in a bird’s neck; 
ed curve described ‘ec the 
intestine (azz 
silicle (sii) n. arn silicula, a little 
pod silicula, or very short fla 
form of siliqua (407¢.). 
[L. sédtcula, a 
tlic 
e pod.] Siliculose ; siliculous ; 
like or fert. or oe ie > abet 
were (silik’wa) 7. qua, a 
pod Pe ceglindrical aria 
divided in o by a false tum, 
Secattaiate of the Crotiienas 
(d08. 
silique (silék’ on siliqua 
iquiform (silik’ wiférm) a. 
ligne pod; forma via: 
Formed like a silique (bot ke). 
siliquose (silikwds) a. [L. sz/igua, 
pod.] Siliquous ; bearing siliques 
bot. 
simian (sim’‘iin) @. [L. simia, an 
ape.] Possessing the characteris- 
tics of or Zer¢. the anthropoid apes 
sool. 
simple eyes, rae which occur with 
or without c mpoun s in the 
adults of sien Insects ; usually the 
only eyes possessed arvae ; 
eyes with only one lens (zoo/.). 
