INDEX AND GLOSSARY 



499 



which does not greatly exceed their 

 breadth and which have soft non-ligni- 

 fied walls, 60 : ground parenchyma, 413, 

 4'5 



Parietal (piiriei, a wall), applied to the 

 layer of coelomic epithelium lining the 

 boidy-wall, 274 



Parthenogen'esis (jropfleVot, a virgin : 

 yfVccri?, origin^, development from an 

 unfertilized ovum or other female gamete, 

 200 



Parthenogenet'ic ova, characteristics of, 



2.S9 



Pasteur, Louis, researches on yeast, 76 



Pasteur's solution, composition of, 76 



Pectoral Arch and Fin, 378 



Pedal (fes, the foot) ganglion, Mussel, 

 362 



Pedlcellarla, 508 



Pelvic Arch nnd Fin, 1179 



PENICILLIDM (penicillum, a painter's 

 brush, from the form of the fully-deve- 

 loped aerial hypha:): — Figure, 186: oc- 

 currence and general characters, 184 ; 

 mode of growth, 185 : microscopic 

 structure, 185: formation and germina- 

 tion of spores, 189: sexual reproduction, 

 J90 : nutrition, 190: vitality of spores, 



'9' 

 Pepsin (n-enrii), to digest), the proteolytic 

 or pepsonizing ferment of the gastric 

 juice, 12, 80 



Peptones, 12 



Perianth (ir^pt, around : a\4ii%, a flower), 



the proximal infertile leaves of a flower, 



468. 471 

 Pericardial Slnns, Crayfish, 337 

 Pericardium (irept, around: xapSi'a, heart), 



Mussel 355 : Dogfish, 372 

 Pericycle (jrepi, around : icvkAos, a circle), 



418, 463 

 Perisperm (»r«pt, around : <nrep/i.a, seed), 



nutrient tissue developed in the nucellus 



of the seed, 476 

 PerlStom'e (irept, around : trrotia, the 



mouth), Vorticella, 128 

 Peristom'iiun (ircpi, around : OTOfxtOf, a 



little mouth), the mouth-bearing segment 



of worms, 268 

 Perltone'um (n'€ptToi<aio>>), the membrane 



covering the viscera, 372 

 Pet'als (n-eraXoi', a leaO> the inner or dis- 

 tal perianth leaves in the flower of 



Aneiosperms, 464 

 Phar ynx (<<>dpvYf, the throat) :— Poly- 



gordius, 277 : Dogfish, 381 

 Phloem (<^Aot6{, bark or bast), the outer 



portion of a vascular bundle, 417 

 Phyla {<i>v\ov, a tribe) of the animal king- 

 dom, 304 : of the vegetable kingdom, 



432 

 Phyll'ula (diminutive of <friiAXov, a leaf), 



the stage in the embryo of vascular 



plants at which the first leaf and root 



have appeared, 360 : contrasted with 

 gastrula, 428 



Phylogeny (<f>iXov, a race : yivt<Tii, 

 origin), the development of the race, 147 



Physiol 'Ogy {<(>v<nt, the nature or property 

 of a thing : Aoyos, a discussion), the de- 

 partment of biology which treats of 

 function, 9 et seq. 



Pigment-spot, Euglena, 47 



Pileus {pileus, a cap), Agaricus, 191 



Pinnule (dim. o( pinna, a feather), of leaf, 

 420 



Pistil {pistillum, a pestle, from pinso, to 

 pound.) See Gynoecium. 



Pith. See Medulla. 



Placold scale, 369 



Plan'Ula (diminutive of irAaivf, a wander- 

 ing about), the mouthless diploblastic 

 larva of a hydroid, 246 



Plant, definition of, 179 



Plants, classification of, 434 



{"las'ma (irAa<rfia, anything moulded), of 

 blood, 56 



Pla8mo'dlam(irAao'fia,anything moulded), 

 52-55 : comparison of with zygote, 5* 



PlastiO (irAatrrtKOf , formed by moulding) 

 prodUOtS, products of katabolism which 

 remain an in tegral part of the organism, 33 



Pleopod, 321 



Pleurobranchla (n-Aevpoi', side : ^payxia, 

 gills)- 337 



Pleuron (»rAf upd*", side), 320 



Podobranchla (irovt foot, /Spayx*" E>ll)) 335 

 Pod'omere (n-otit, a foot : M'pot> a part), a 



limb segment, 321 

 Polar cells, formation of, 259 

 Pollen grain (pollen, fine ffour), a name 



given to the microspore (g.v.) ol Phanero- 



grams. 

 Pollen-sac, a name given to the microspo- 



rangium (q.v.) of Phanerogams. 



Pollen-tube, 458, 475 



Pollination, 4<:8, 475 



POLYOORDHJS (b-oAvs, many : TdpStot, 

 King of Phrygia, inventor of the Gordian 

 knot): — Figures, 269, 271, 282, 284, 291, 

 293> 297 > 300 • occurrence and general 

 cnaracters, 268 : metameric segmenta- 

 tion, 270 : mode of feeding, 270 : enteric 

 canal, 270, 277 : cell-layers, 273 : 

 coelome, 270 : distribution of food, 278 : 

 blood-system, 279 : nephridia, 281 : 

 nervous system, 283 : differentiation of 

 definite organs and tissues, 288 : repro- 

 di;ction, 290: development and meta- 

 morphosis, 292 



Polymorph'lsm (woAvt, many : jbiopi^^, 

 form), existing under many forms, 249 



PoryplaSt(iroAvs, many:irAa<rr6s, formed, 

 modelled), the multicellular stage of the 

 embryo before the differentiation of cell- 

 layers or organs : — Hydroids, 246 : Star- 

 fish, 316 : Nfoss, 405 : Fern, 427 



POEPlTA(jrdpir>j,a brooch), 249: F jgure,25i 



