MER- 
part ; zoom, animal.] A fragment 
of a unicellular animal containing 
part he SL HE obtained 
by artificial wai Be (zo 
merrythought,—t spe ‘of hate 
formed > the ae of c 
- Sot (zo. 
cas (ners) n. [Gk. meros, thigh.] 
" Meros, which see. 
esamoeboid (més’Amé'boid) ce 
nacional cells of the blood Sede 
ood corpuscles are 
b.). 
m més’ark) @. [Gk. mesos, 
middle ; avche, beginning.] "4 
met 
xylem having m xylem develop- 
ing in all directions from 
protoxylem, characteristic of ferns ; 
having the proto ee surrounded 
by cena ( 
cats akeson't ik) a [Gk. 
MESOS, gener ; axon, axis.} With 
up the middle digit (z00 
mesencephalon (més renee 15n, -séf-) 
Gk e; em, in; 
mid-brain, 
comprising corpora qua adrigemina 
(bigemina) and cerebral peduncles 
(anat.). 
mesenchyma (méséng’kim4) 7. [Gk. 
mesos, middle ; engchein, to — 
in.] A mas s of tissue, 
between oe and pain a oi 
of a gastrula (emé.). 
esenchyme (méséng’kim). Mesen- 
yma. 
esenterial (més‘énté’rial, méz’énté’- 
vial) a. — mesos, middie ; enteron, 
gut.] a mesentery; affi. 
ra of Actinozoa (z00 
rane (més éntér'ik, mis entir ik) 
Gk. ys middle ; emferon, 
é 
enterium, 
a mesentery. "A fold of peritoneum 
derived from the mesentery, retain- 
ing the vermiform appendix in 
position (amat. 
<fov™ 
mesenteri (més’ goer ——— métz’- 
énté’riim) #. [L enterium, a 
[Gk. 
ae middle ; enteron, gut.) The 
main digestive cavity of Actinozoa 
183 
MES- 
and other ano ikeagghet the portion 
of the alimen x canal lined by 
endoderm 200 
ending inwards from wr body- 
oot in Fa an (zoo. 
eron (m és bs ver) n Fy 
median cranial bone o verte- 
middle p 
mesial (ane 
he 
ath sia. [Gk. ragga we 
In t lon 
middle vertical or i- 
[Gk. mesos, 
mesoarium se oa ritim) 7. [Gk. 
mesos, — oarion, a small egg.] 
A mesovar 
meso ———— (nds dbén’thds) * [Gk. 
benth sage} 
tween 100 fathoms and 500 fathoms 
(zool., bot. 
mesoblast (més‘ oblast) 7. es MESOS, 
_ middle ; d/aszos, bud J meso- 
* derm or middle "layer of an pc a 
emb, 
mesoblastema (méséblisté’ma). 
Mesoblast. 
mesoblastic (més'6blds’‘tik) a. [Gk. 
MeSOS, middle ; blastos, bud.] 
or developing from the middle layer 
(em. 
mesobranchial 
Gk. mesos. 
gills.] Pert. the middle gill- pet 
as in Crustacea (zoo/.). 
hus (més‘ébréng’kiis ) 
mesobrone m1. 
[Gk. mesos, middle; drongchos, 
har naga coo a be, 
