female, 124
table of, 130
Genital cord, 123

ridge, 124

Germ cell, 12

Germinal cells, 58

Germinal epithelium, 117

connection with Wolffian tubules, 120
formation of ovary from, 124

of testicle from, 125

Germinal spot, 8

Germinal vesicle, structure of, 8
Giant cells of placenta, 54
Gill slits, 103

Giraldés, organ of, 120

Girdle, thoracic and pelvic, 164

Globular processes of His, 95

Glomeruli (glomus, ball of thread), 119, 121

Golowine on ganglion rudiments, 75

special sense-organ rudiments, 76

Götte on Wolffian duct, 118

Graaf, de, on pineal eye, 68

Graafian follicle, 6

union of cells of, with ovum. 7

changes prior to escape of ovum, 9
formation of, 124, 125

Gradenigo on the stapes, 168

Gruber on a case of venous abnormality, 155
Gubernaculum testis (a helm), 126

changes of in descent of testicle, 127
Guinea-pig, formation of amnion in, 43
allantois in, 46

Gyrus subcallosus of Zuckerkandl, 81

Heape, on blastodermic layers in the mole, 18
rudimentary blastopore in the mole, 22
Heart, formation of, 38, 136

beginning of beat, 39
endothelial tube of, 134

folding and division of, 137, 141, 142
saccus reuniens, 139
septum spurium of, 141

valves of, 141, 142
fretum Halleri of, 141
septum inferius of, 141
auricular canal of, 142

septum intermedium of, 142
chorda tendineæ of, 142
foramen ovale of, 144

limbus Vieussenii of, 144
muscle of, 145

columnæ carneæ of, 146
foetal, peculiarities of, 146

Hedgehog, placental sinuses in, 52, n.

epiblastic attachment to uterus in, 53

Henle, loops of, 122

Hensen, canalis re-uniens of, 91

on Wolffian duct, 118

heart, bilateral, 134

Hermaphroditism ('Epuns, Appodíτn, a male and
female god), 12

Hertwig, O. and R., on polar globules in
echinoderms, 9

celom-invaginations of, 22

coelom, typical development of, 24
mesodermic layers of, 26, 27, n.
mesenchyme of, 26

Hind brain, 38

Hind gut, formation of, 36

connection with allantois, 46

with Wolffian duct, 118

His, W., abdominal stalk of, 46
on accessory thyroid bodies, 110
allantois, 101, n.
arterial arches, 147

ascending roots in medulla, 66
auricular canal, 142

axis cylinders, growth of, 75
blood-vessels, 151

Broca's area, 79

cephalic clefts, 102, n.

endothelial tube of heart, 136

on epiblastic origin of ganglia and posterior

Lungs, development of, 109
Luschka, on urachus, 122

notochord, remains of, 162
Lymphatic system, 157

MACKAY on arterial arches of the bird, 150
Macula germinativa (germinal spot), 8
Malleus (a hammer), 167, 168
Malpighian corpuscles of spleen, 108
of Wolffian body, 120

of permanent kidney, 122
Marshall, vestigial fold of, 154

Milnes, on head cavities, 161

Martin on Wolffian duct, 118

Masius on epiblastic connection of blastodermic
vesicle with uterus, 53

Mechanical theory of development, 24
Meckel, J. F., 23

Meckel's cartilage, 166, 167, 168

Medulla oblongata, 62

formation of, 63

Medullary folds, formation of, 30, 32

groove. See NEURAL GROOVE.

Membrana limitans of retina, externa, 86

Micropyle (kpós, small, wúλn, opening), 11
Mid brain, 38