GER- 
of cells in a developing ovum, epi- 
blast, hypoblast, and later mesoblast 
(emb.). 
germinal spot,—the nucleus of an 
— femb. 
germinal vesicle,—the nucleus of an 
egg, ira formation of polar- 
em a 
wd) Begin a’shiin) 7 
pri germogen or primitive 
central cell (zoo/.). 
gestation (jésta’ shin) # [L. gerere, 
to carry.]| The intra-uterine period 
= mb) development of an embryo 
—large nerve-cells in 
ean oplaxes; osteo- 
clasts ; large multinuclear proto- 
plasmic m masses found in marrow, 
al.). 
—greatly enlarged and 
saotitied nerve-fibres running longi- 
tudinally through the ventral nerve 
ord of some invertebrates, as 
Worms (zoo/.). 
gibbous (gibiiis) a. [L. gibbus, 
humped.] Inflated; saccate or 
pouched, as oe lateral sepals of 
eon oe (d0 
M.E. gille ill. WA 
siete es alee ee 
respiratory organ of asi abacterl 
ing animals (zoo/.) ; one of a number 
of lamellae radiating from the stalk 
of . mushroom (40 
—part of the visceral skele- 
to oe in the region of F Seana gills ; 
a arch (zeo/.), 
1 basket,—the branchial skeleton 
f lampreys, composed of continu- 
ous otis —_ 
boo ratory organ of 
chn ro consisting of a 
large number of leaf-like structures 
116 
GLA- 
between which the water circulates 
(zool.). 
gill cleft,—a branchial cleft formed 
on the side of 7 — nx (zooi.). 
gill let operculur 
gill helix,—a ier a coiioa gill-like 
organ in certain Clupeidae (zoo/. eae 
gill pouch,—an 
gills and oe directly or 
indirectly by. duct with the 
exterior, seen in "hai cad Petro- 
myzon n (zoo ; 
ers,—small spine-like struc- 
tures attached in a single or double 
row to branchial arches to prevent 
escape of food (ood. 
1 ants, —e ithelia 1,  post- 
branchial, or suprapericardial bodies 
arising in the pharynx of higher 
vertebrates (zool. 
—o ique gelatinous rods 
supporting = spe da in Cephalo- 
chorda (zool. 
gill slits,—a 5 eries of perforations 
leading from a arynx to the exterior 
gums.| Peré. 
ginglymoid (ging'glimoid) a [Gk. 
gingglymos, hinge - joi 
structed like a hi bie bani (anat). 
gsinglymus (ging’glimis) # [Gk 
gingglymos, hinge-join n ar- 
ticulatio cted to allow 
otion in one plane only (avaz). 
girdle (gér'dl) AS. t 
d.] In appendicular skeleton, 
the supporting structure at sho 
nd hip, each — typically 
of one dorsal and ventral 
Samer ; the reste tie of insects 
ool.). 
ioxueta (glibél’a) #. [L. glader, 
bald.} The space on the forehead 
between the superciliary ridges 
of the cephalic shield of Trilobites 
al.). 
— (glab'rat) a. [L. glader, 
th.] Becoming smooth; = 
