166 



INDEX 



Placodes, auditory, 65, 122 

 lens, 98 



Pleural region of coelom, f. 46D, 150 



Plica encephali ventralis (= ventral 

 cephalic fold) f . 42 



Pocket, subcaudal, f. 31, 81 

 subcephalic, f. 31, 47 

 Rathke'sf. 35, f. 43, 95, 117 

 Seessell's, f. 43, 102, 124 



Polar bodies, 9 



Polyspermy, 10 



Pons, 118 



Post-anal gut (see gut). 



Posterior appendage bud, f. 39, f. 40, 

 112 



Posterior commissure, f. 42 



Posterior intestinal portal, f. 31 



Posterior neuropore, 56 



Post-oral arches, 103 



Post-oral clefts, 103 



Prechordal portion of brain, 55 



Pre-oral gut (see gut). 



Primitive groove, f. 13, 31 



Primitive gut (see gut). 



Primitive node (= Hensen's node, 



q. v.). 



Primitive pit, f. 13, 28 

 Primitive plate, f. 29 

 Primitive ridge or fold, f. 13, 28 

 Primitive streak, as growth center. 



33 



fate of, 56 



formation of, f. 9, f. TO, 28 

 interpretation of, f. 9, f. 10, 28, 



35 



location of, f. 8, f. u, 27 

 Primordial follicle (= very young 



ovarian follicle) f. i 

 Proamnion, f. 12, 37 

 Proctodaeum, f. 31, 130 

 Pronephros, f. 51, 144 

 Pronephric duct, 146 

 Pronephric tubules of chick, f. 52, 



146 



Prosencephalon, f. 20, 54, 6 1, 95, 114 

 Prosocoele (= lumen of prosen- 



cephalon, q. v.). 



Ramus communicans, 119 

 Rathke's pocket, f. 35, f. 43 95, "7 

 Recapitulation, 43, 102, 144 

 Recessus neuroporicus, f. 42 



Recessus opticus, f. 42, 115 

 Reduction division of gametes, 9 

 Retina, pigment layer of, f. 45, 96, 122 

 sensory layer of, f. 45, 96, 122 

 Rhombencephalon, f. 20, 54, 6r, 65 

 Rhomboccele (= lumen of Rhomben- 

 cephalon, q. v.). 

 Roof plate of spinal cord, 119 



Sclera of eye, 122 



Sclero tomes, f. 38, f. 44, 107 



Sections, location of, 4, 34 



Seessell's pocket, f. 43, 102, 124 



Segmentation, 14 (see also cleavage). 



Segmentation cavity (see blastocoele). 



Sensory layer of retina (see retina). 



Septa of yolk sac, f. 30, 84 



Serial sections, 4 



Sero-amniotic cavity, f. 30, f. 32, 87 



Sero-amniotic raphe, f. 30, f. 32, 87 



Serosa, f. 30, f. 32, 86 



Sex cells (see gametes) . 



Shell, f. 3, 10 



Shell membranes, f. 3, 10 



Sinus region of the heart (see sinus 



venosus) . 



Sinus rhomboidalis, f. 21, 55, 99 

 Sinus terminalis (= terminal vein, 



q. v.). 



Sinus venosus, f. 23, f. 49, f. 50, 72 

 Somatic mesoderm (see mesoderm). 

 Somatopleure, f. 17, 49 

 Somites, differentiation of, f. 38, 105 



formation of, 56 

 Spermatozoa, f. 2, 10 

 Spinal cord, 54, 118 

 Spinal ganglia (see ganglia). 

 Spinal nerve roots, development of, 



f. 44, 1 19 



Splanchnic mesoderm (see mesoderm). 

 Splanchnopleure, f. 17, 49 

 Stomach, f. 43, 126 

 Stomodaeum, f. 31, f. 35, 101, 124 

 Subcaudal space or pocket, f. 31, 81 

 Subcephalic space or pocket, f. 17, 



f. 3i, 47 

 Subgerminal cavity (= blastoccele 



q. v.). 



Sylvian aqueduct, f. 42, 117 

 Sympathetic ganglia, f. 44, 120 

 Sympathetic nerve roots (see ramus 



communicans). 



