INDEX AND GLOSSARY 



405 



PileUS (ptlcus, a cap), Agaricus, 189 



Pinna (pinna, a feather), of leaf, 348 



Pistil (pistilliiw, a pestle, from pinso, to 

 pound). See Gynoecium. 



Plan'ula (diminutive of irAaros, a wander- 

 ing about), the mouthless diploblastic 

 larva of a hydroid, 247 



Plant, definition of, 174 



Plants, classification of, 174 



Plas'ma (Tr\da-y.a, anything moulded), of 

 blood, 56 



Plasmod'ium (7rA.acr/u.a, any thing moulded), 

 52-55 : comparison of with zygote, 54 



Plastic (TrAao-Ttxos, formed by moulding) 

 products, products of katabolism which 

 remain an integral part of the organism, 



Pod'omere (TTOU?, a foot : juepos, a part), a 

 limb-segment, 310 



Polar cells, formation of, 258 



Pollen grain (pollen, fine flour), a name 

 given to the microspore of Phanero- 

 gams. 



Pollen-sac, a name given to the microspo- 

 rangium of Phanerogams. 



Pollen-tube, 373, 379 



Pollina'tion, 373, 379 



POLYGORD'IUS (TTOA.V?, many : TopSio?, 

 King of Phrygia, inventor of the Gordian 

 knot) : Figures, 268, 270, 281, 283, 290, 

 292, 294, 296, 299 : occurrence and gene- 

 ral characters, 267, 269 : metameric seg- 

 mentation, 267-269 : mode of feeding, 

 269 : enteric canal, 269, 273 : cell-layers, 

 272-274 : ccelome, 269, 273 : distribution 

 of food, 277 : blood-system, 278 : nephri- 

 dia, 280 : nervous system, 282 : differen- 

 tiation of definite organs, 287 : and tissues, 

 288 : reproduction, 289 : development and 

 metamorphosis, 295-302 



Polymorphism (TTOA.V?, many : fj-optfrri, 

 form), existing under many forms, 

 249 



Pol'yplast (TTOA.VS, many: irAaaTog, formed, 

 modelled), the multicellular stage of the 

 embryo before the differentiation of cell- 

 layers or organs : Hydroids, 245 : Moss, 

 333 : Fern, 355 



PORPITA (TTOPTTTJ, a brooch), 250 : (Figure), 



251 



Primor'dial utricle, 194, 208 



Proctodae'um (n-pwKTos, the anus : 6Sai6s, 

 belonging to a way), an ectodermal 

 pouch which unites with the enteron and 

 forms the posterior end of the enteric 

 canal, its external aperture being the 

 permanent anus, 294 



Pro-embryo, chara, 217 (Figure) 



Pro-nucleus, female, 258 : male, 259 : 

 conjugation of male and female, 259 



Pl'OStom'ium (wpo, before : OTOJAKH-, a little 

 mouth), the first or pre-oral segment in 

 worms, &c., 267, 292 



PROTAMCEBA (jrpwTos, first : a/ 

 changing), 9 (Figure). 



Prothal'lus (Trpo, before : 0aXA6s, a twig), 

 the gamobium of vascular plants : Fern, 

 351 : dimorphism of in Equisetum, 363 : 

 reduction of in Salvinia, 366 ; Selagi- 

 nella, 367, 368, and Gymnosperms, 372, 

 373 : retarded development of in Angio- 

 sperms, 377 



Prothallus, secondary, Selaginella, 368 



Prot'eids( 7rpo>T09, first), composition of, 5 



ProtiSt'a (TTPCOTICTTO?, the first of all), the 

 lowest organisms intermediate between 

 the lowest undoubted animals and plants, 

 1 80 



ProtOCOC'CUS (TTpwros, first : KOK/CO?, berry). 

 See Hffimatococcus. 



PROTOMYXA (TrpdjTos, first :/xi!fa, mucus): 

 Figure, 50 : occurrence and general cha- 

 acters, 49 : life-history, 51 : animal or 

 plant? 179 



Protonem'a(7rpu)ro?, first : frj/xa, a thread), 

 Moss, 332, 335 _ 



Prot'oplasm (Trpwros, first : n\dcriJ.a, any- 

 thing moulded), composition of, 5 : pro- 

 perties of, 5-7 : micro-chemical tests for, 

 7, 8 : minute structure of, 62, 63 : con- 

 tinuity of in Fern, 346 : in Polygordius, 

 288_ : intra- and extra-capsular, Radio- 

 laria, 151 



Protozoa, the, 304 



Prox'imal (proximus, nearest), the end 

 nearest the point of attachment or or- 

 ganic base, e.g. in the stalk of Vorticella, 

 124 



Pseud 'opod ((/>ev6^?, false : 7rou5, foot), 

 described, 4 : comparison of with cilium, 

 34, 52 : in columnar epithelium, 59 : in 

 endoderm cells of Hydra, 228 



PteriS. See Ferns. 



Punctum vegetationis. See Growing 

 point. 



Putrefac'tion (putrefacio, to make rotten), 

 nature of, 81 : a process of fermentation, 

 90 : conditions of temperature, moisture, 

 &c., 91, 92 



Putres'cent (putresco, to grow rotten) 

 solution, characters of, 37, 81 



Putres'cible infusion, sterilization of, 96- 

 100 



Pyren'oid (nvpriv, the stone of stone-fruit : 

 elfio?, form), a small mass of proteid 

 material invested by starch, 27 



Radial symmetry, starfish, 305 



RADIOLAR IA (radiits, a spoke or ray): 



Figures, 150, 151 : occurrence and general 



characters, 150 : central capsule, 150 : 



intra- and extra-capsular protoplasm. 



