BIT- 
Appl. the two 9 A bones; a 
line joining the posterior ends of the 
wit ge division 
ternate (4o/. 
valent (biva’lént, biv’alént) a [L. 
itself again 
a musse 
shell (zool.); or a seed-capsule of 
ee ——- bot.). 
i 
bivente mec onitag tér sérvi isis) n. 
{i bis, schon venter 
ec 
sisting of two fleshy broad ends 
with a enigae tendinous portion in 
the mid 
le (anaz.). 
biventral ee tral) a, [L. ds, twice; 
. muscles of the 
bis, tw — se 
Seamites “Got) ; with two ptipes 
(zool.). 
bivium — iim) ” [L. twice ; 
via, way.] Geterally the posterior 
pair of ‘ambulatral areas in certa 
with air or fluid “(bot 
pei abigesathe cysticercus 
stage bh tai wien: S (zo0/.). 
blade (bina) A. << lac leaf.] The 
part of leaf of grasses 
(40t:). 
blastaea (blasté’4) 7, [Gk. blastos, 
bud.] A planaea or ciliated planula, 
‘ios hypothetical stage in evolution 
eeeel (blas’télaz’ma) 7., blastel- 
asmata (blas'téldz’mata) piu. [Gk 
e forma- 
— of the epiblast and lepechtiad 
en 
astema (blaisté’mA) 7., blastema 
(Dlste’mata) plu. [Gk. reermete 
“ge mh i ormative substance be 
e€ primordiu 
organ yen .: the thallus of a fiche 
34 
BLA- 
oe ae Sgendioverss ye a. [Gk. 
blastos. karpos, fruit.] De- 
anne while still cemeacel by 
the pericarp (404. 
blastocheme (blis 'tokém) n. {SK 
blastos, bud; ochema, vessel.| A 
ae ee individual in some 
Medus 
blastochyle (blis'tokil) 7. [Gk. dlastos, 
bud ; chy/os, juice.] The fluid ina 
blastocoel, or segmentation cael 
platocoel (blas’tésél) 7, 
bud ; £oi/os, hollow. | 
tion-cavity 
b.). 
[Gk. dlasios, 
Thesegmenta- 
of a developing ovum 
ves 
meee eee tédérm) #. [Gk. 
blastos, bud; derma, skin.] The 
__ germinal disc (emb, re 
aD 
of cells, an early stage — nthe develop- 
ment of a fertilized ovu 
Stetr ate BT "TGk. blastos, 
bud ; 
[Gk. 
— ry genos, offspring. ] 
Appl. inactive idioplasm Iter- 
able till time and place of activity 
are hates (emd.). 
blastom (blas’ témér) n. (Gk. 
Masiee, © bud ; meros, part.] One of 
the cells formed during the primary 
divisions of an egg (em 
lastoneuropore (blis’ ténii ‘répor) # 
[Gk. dlastos, tak neuron, Nerve ; 
poros, ssage. A temporary 
passage connecting blastopore and 
neuropore (emzd.), 
blastophore (blis’ téfor) )a. [Gk. d/astos, 
bud ; pherein, to bear. ] a 
origin = plumule (40/,) ; Alcyon- 
aria the reproductive body; giving 
rise usually to buds; the central 
of the spermocyte mass in 
sii nics 
