462 | General Notes. 
mě, myoblast cells. pm, todee 
md, mandible. S£, ead ee ganglion. 
men, mesenteron, sm, stomodzum. 
mabe Ist maxilla, ig, thoracic ganglion. 
mx’’, labium, or second maxilla. vm, ventral muscle, 
mi, isa like portion of mesenteron. y, yolk. 
N, nerve-furrow. yp, yolk-pyramids. 
@, cesophagus, I, Ist pair of feet. 
P, primitive groove. in os fee 
pe, procerebrum. gay ie a gi 
pd, primitive disk. 
FIGURES. 
sis I ene in = g oe ahe) nuclei are moving toward the surface. 
2 have reached the surface, and show an 
active een ‘eine 
lastodermic alk have no nucleus, and are placed at equal ¢ distance 
a 
“ 
apar 
atur & fie blastoderm cells now forming a continuous layer. 
See g, —Cross-section of the egg | with blastodermic disk, also showing the disposi- 
tion of the endodermal c 
“ 6 Cross seeion of the ao disk, with the myoblast cells (mb) 
alrea 
is «  7.—-Cross-section through the thorax of the embryo; the body-cavity extended 
A into the limbs, 
| “ — 8,—Longitudinal n of the embryo; the yolk-pyramids (y) form a com- 
mon inner yolk-mass (y). 
Beer aa Tras ie Ame the heart; Æ, cavity of the heart; the two halves of the 
5 s ses having united do pasia sagan they are still open and are 
5 i isunei Dy the walls of the mesen 
>a “ 10,—Cross-section of an embryo, showing the blood-lacunæ separate ed o 
se back by the dorsal onpi (do); the intestinal fasciated layer pa 
k 
= bits Dainai segmented, swi the rudiments of the appendage 
py Pi (ab) and nervous ganglia ( e-n, 
12,-A more ln embryo, Pi on stomodzeum (sf) indicated as 4 
frontal protubera 
ey Tae ocak the recently hatched larva, adic the cells of ber 
£ on or chyle-stomach, and the cellular layer on the front t surface 
ithe pobio t(s or crop 
37 
DEVELOPMENT OF THE Honey Bee.—An abstract of Grassi’s 
Aei tions appears in the Biol. I- Centralbiatt which we translate. 
ee fos doa te of the honey bee is much more simple ! in some 
| cts than that of the ante cricket because th 
hie arrested upon the back. The ea re so a from the 
ectoderm that a median ventral plate at the same time sinks in- 
r and becomes overgrown by the adjoining later parts. This p 
