Vlll 



INDEX OF PART I. 



Ovum continued. 

 fertilization of, 1 1 

 mammalian, descent of, 8 

 maturation of, 9 

 meroblastic, 8 

 permanent, 125 



polar globules, extrusion from, 9 

 primordial, 124 

 segmentation of, 16 

 size of, 6 

 striae of, 6 

 structure of, 6 

 yolk of, 7 

 zona pellucida or zona radiata of, 6 



PALATE, the, 97 



cleft, 97 



Pancreas (ttav, all, Kpeas, flesh). 108, 113 

 Pander, researches on blastoderm, 23 



mechanical theory of, 24 



blood islands of, 39 

 Papillary muscles, 142 

 Pdrablastic cells (vapd, beside, fi\tt.<n6s, germ), 



21, 25, 27 

 Parachordal cartilages (napd, beside, xP^j 



string ; near the notochord), 166 

 Parker, on formation of xiphoid, 163 



stapes, 1 68 



Parovarium (irapd, beside ; ovarium, ovary), 120 

 Pars ciliaris retinae, 86 

 Parthenogenesis (irapOtvos, virgin ; yeveais, 



origin), polar globules in, 14 

 Parturition, separation of membranes in, 55 

 Paterson on origin of sympathetic system, 81 



limb muscles, 163, n. 

 Penis, 128, 129 



Pericardium (*/>:, about ; KapSia, heart), 135, 159 

 Peritoneum (-repi, about ; reii/<a, to stretch), 159 

 Perivitelline space (vitdlus, yolk), 9 

 Peters on hyomandibula, 168 

 Petromyzon (verpos, a stone ; ptfy, to suck ; 



lamprey), pituitary body in, 68 

 Pfliiger, egg tubes of, 124 

 Pharyngeal septum, 100 

 Pharynx, 101 



Philtrum (<pi\Tpov, loveliness), 95 

 Pineal gland (pinea, a fir-cone), 61, 67 



as rudimentary eye, 68 

 Pinna, the (a feather), 95 

 Pituitary body (pltuita, phlegm), 61, 67 



formation of, 68 



in Petromyzon, 68 



connection with stomodsnim, 100 

 Placenta (a cake), 44 



formation of, 49, 51 



basal layer of, 51 



subchorionic membrane of, 51 



loculi or cotyledons of, 51 



structure of sinuses of, 52 



intervillous spaces of, 51, 53 



weight and size of, 53 



microscopical structure of, 53, 54 

 Placental decidua, 51 



sinuses, structure of, 52 

 Plane, median, 4 



Plasma.- of Weismann, nuclear, nutritive, ger- 

 minal, histogenetic, 14 

 Pleurae (ir\fvpd, a rib), no, 159 

 Pleuro-peritoneal cavity. Sec CO>:LOM 



Plica gubernatrix (guiding fold), 126 



semilunaris, 89 

 Polar disc, 1 1 



globules, 6 



formation of, 9, 12 

 where observed, 9 

 of Ascaris megalocephala, 9 

 of plants, 9 

 Minot's theory of, 12 

 Weismann's theory of, 14 

 Pons (bridge), 62 



formation of, 66 



Porta vestibuli (gate of the vestibule), 156 

 Prae-hyoid glands, 1 10 

 Pregnancy, changes of uterus in, 48 

 Primary placental circulation, 53 

 Primitive groove, formation of, 19 



as extension of blastopore, 22 

 as humologue of part of entoderm, 



23 



Baltour's view of, 23 

 connection with neural groove, 



30, 32 

 streak, formation of, 19 



an ectodermal thickening in- 

 dented by blastopore, 22 

 origin of mesoblast irom, 22 

 connection with notochord, 32 

 velum (velum, a curtain). 100 

 Pristiuras, heart in, 136 

 Proamnion, 35, 42, n. 

 Process, nasal, 95 



fronto-nasal, 95, 101 

 maxillary, 97, 101 

 globular, 95 

 tympano-hyal, 168 

 styloid, 169 



Processus vaginalis, 127 

 Proctodaeum (irpuKr6s, the anus), 108 

 Pronephros (Trp&, before ; ve<pp6s, kidney), 115 

 Pro-nucleus, female, male, 9, u, 12 



chromatin filaments, in, 16 

 Prosenc ephalon (irp6s, besides ; fyKe<pa.\os , brain), 



68 



Prostatic vesicle, 124 



Protovertebrae (trptaros, first ; vertebra, I turn;, 

 37 



See MESOBLASTIO SOMITES. 

 Protovertebral cavity, 37, 160 

 Pulmonary blood-vessels, no 

 Pupillary membrane, 87, 88 

 Purkinje, germinal vesicle of, 8 

 Pyramidal tracts, the last to be medullated, 60 

 Pyramids, anterior, 65 



QUADRATE, the, 168 



RABBIT, polar globules observed in, 9 

 pro-amnion in, 35 

 stomodseum in, 99 

 Ramon y Cajal, on posterior roots of spinal 



nerves, 75 



Rathke, diverticulum of, 68 

 on hypophysis cerebri, 100 

 visceral arches, 103 

 arterial arches, 147, 150 

 posterior vertebral veins of, 153 

 trabeculse cranii of, 166 

 Rauber, layer of, 17, 18, 22, n., 23 



on the mechanical theory of development, 24 



