INDEX 



ABDOMINAL STALK, 54 



Achromatin, 3 



Adrenals, development of, 58, 135, 205 



medulla of, from chromaffin system, 135, 



206 



Agar, on anterior mesoderm in Lepidosiren, 249 

 Age of embryos, estimation of, 80 

 Alecithal ovum, definition of, 9 



type of cleavage in, 27 

 Alimentary canal, development of, 156 



glands of, development of, 164 

 Allantois, arteries of, 217, 223 



blood- supply of, in lower amniota, 217 



degrees of development of, in lower 

 mammals, 53 



formation of, 55 



fate of, 55, 85, 185 



veins of, 206 

 Allen, on epithelium of genital ridge, 188, 191 



on rete tubules, 192 

 Amitosis, 4 

 Amnion cavity, origin of, in man, 29 



ectoderm, origin of, 30 



in guinea-pig, 31 



in mice and rats, 31 



formation of, in rabbit, 34 



stalk, 30 



stalk, mesoderm in, in higher Primates, 

 34 



structure of, 70 



Amniota, blood-supply of allantois, in lower, 

 217 



higher, head- segmentation in, 249 



lower, gastrulation in, 43 



peripheral mesoderm in, 34 



pronephros rudimentary in, 177 

 Amphibia, gastrulation in, 43 



liver-parenchyma in, 174 



lymph-hearts in, 236 

 Amphimixis, 17 

 Amphioxus, 42, 46 

 Anal tubercle, 201 



Anamnia, homologue of intermediate cell- 

 mass in, 177 



nephrotomes in, tissue corresponding to, 

 51 



pronephros, a functional organ in larval 



stage, 177 

 Annulus fibrosus of intervertebral discs, 251 



ovalis, 213 



Anus, formation of, 164, 201 

 Aorta, bulb of, 63, 207, 215 



dorsal, 217, 221 



primitive, formation of, 64, 206 



ventral, 218 



\ Apathy, on formation of neuroblasts, 98 

 ! Apes, entypy of germinal area in, 32 



notochordal canal in, 39 

 Appendix, vermiform, development of, 164 

 Aqueduct of Sylvius, 111 

 Archenteron, 47 



i Arches, aortic, formation of, 217 

 fate of, 219 



branchial, 83 



rudimentary fifth branchial, Kallius, 



167 



Archoplasm, 2 

 Area, germinal, entypy of, 30 



germinal, in blastocyst, 32 



paraterminalis, Elliot-Smith, 118, 122, 

 123 



vascular, origin of early, 32 

 Arrectores pilae, origin of, 94 

 Arteries, allantoic, 217, 223 



basilar, 223 



carotid, 221 



centralis retinae, 142 



cerebral, 221 



ciliary, 143 



coeliac, 223 



curling, 79 



facial, 222 



hypoglossal, 223 



infra-orbital, 222 



innominate, 219 



internal maxillary, 223 



mandibular, 222 



middle meningeal, 223 



of the limbs, 224 



ophthalmic, 221 



segmental, 223 



superior intercostal, 223 



stapedial, 222 



subclavian, 223 



superior mesenteric, 223 



superior thyroid, 222 



vertebral, 222, 223 



vitelline, 223 



I Arytenoid cartilages, 169 

 1 Aryteno-epiglottidean folds, 167 



