INDEX 



087 



tion of, in Annelida, 321 ; in 



/'ictens, 120 ; iu Detitaliiiin, 328 ; in Ltrcis- 



.11- a. -'it, 337 ; in ailult Entoprocta, 386 ; in 



Echiuroidea, 163 ; in Palttdiiiu, 310 ; iu 



PuteRa, 293, 29? ; in Pdyyonlim, 134 ; 



in Xijiintcttlits, 380 

 Protozoa, 20, 30 

 1'rotozoaea larva of EitpJiaitsiit, 203 ; of 



Penaeus, 203 

 Pseudozoaea stage in development of Stomato- 



poda, 218 



Pulmonata, 291. 320 

 Pupa of Cirripedia, 202 ; of D'ntccic, 260 ; 



of Gah'i'iicella itli/ii, 268 ; of Holothuroidea, 



585 : of Siiri-i/tiitti, 202 ; of Si/ituj/fi/ 



t/iffitc.ta, 538 

 Pupal phase of development, definition of, 



28 ; interpretation of, 656 

 Pui-punt, 320 

 Pyloric caeca, formation of, iu A*ti.'rii/*, 



171 ; iu Afttt.-riiiii ijililmmi, 477 

 Pyloric gland, formation of, in Cimia. in- 



testinalis, 625 



Pyloric sac, formation of, in Asterias, 471 

 Pyrosoma,637, 639 ; development of, 632-635 



Quadrant of egg, definition of, 106 

 Quartettes of micromeres, definition of, 106 ; 

 formation of, in segmenting egg of Pat<-Iln, 

 293-295 ; in segmenting egg of Planocera, 

 106 : in segmenting egg of Polyyonlius, 

 133-139 



Radial canals of medusa of TV />/'/'' /'/f, 58 

 Radial cells in embryo of Polygordius, 135 

 Radial nerve-cords, formation of, in <>ji/iin- 



thri.<:frarjiUs, 498 

 Radial perihaemal canals, formation of, in 



Asteriiia gibbosa, 475 ; in Echinus escu- 



lentus, 515 ; in Ojihii.it/iri'- f'mi/i/is, 494, 



495 

 Radial plates, formation of, in Ainji/iinrn 



sfjiKimi.tta, 499 ; in A.ifi'rinn i/ihtiiisa, 479 

 Radial shields, formation of, in Ai/tji/ii/'rit 



fH/iitiiiititii, 499 



Radial water - vascular canals, formation of, 

 in Antedon i-osucr-c, 549, 556 ; in Ast'-rii'.*, 

 471 ; iu f.'ii.ciiiiKirin planci, 542; in Ophio- 

 lltri.i: fi-agilis, 492 ; in St/ii<ij>f</ i/ii/i/ufi/, 

 533, 539 



Radiating muscles, formation of, in J'ol;/- 

 i/in-t/ii/n iipj>t-iit./i'-n/iitii.i. 150 



Radius of embryo of Pa/i/i/un/ius, 135 



Radula-sac, formation of, in Loligo, 358, 

 363 ; in PaluiUiKi, 315 ; in I'ntell,', 301 



Rat, development of spermatozoa of, 7 



Rathken, medusa of, 59 



Recapitulation theory of development, 20- 

 25, 649 ; presuppositions of, 220 



Rectum, formation of, in Asteri"*, 171 ; in 

 Asterina yibbosa, 478 ; in embryo of 

 Pedicettina, 400 



Recurrent coil of intestine, formation of, in 

 csculentus, 520 



Reducing division, detinition of, ii 

 Regeneration of eye in Shrimps, 286 

 Jt'-iiift" renifornis, ili-vi-lippmunt of, 87 ; 



formation of skeleton of, 88 

 Reno - pericardia! canal, formation of, in 



Dreissensia, 346 ; in l.H<j, :i62 ; in 



Paludittn, 314 

 Retinula of compound eye, formation of, in 



Astacus,189; inDytiscus,27Q', iu Lin 



237 

 Retraction of polar-lobe in egg 



326 

 Retractor muscles of foot, formation of, in 



itivi.-i.-ii-ii.iiti, 342 ; of funnel, in /,//</., 



361 ; in lars-a of /V//.</c;-i////\ appendicu- 



fn/iis, 148 



, process of, in develoj)inent of 

 , 227 ; in development of Jin, /</,;./, 



259 ; in development of /'i-riji/iim-fn, 260 

 Rhabdites of Ynm/iii, 115 

 l.'habditis larva of Am-'/ri.i //(-y/'"'"' t ' 1 /'/"'/", 



447 ; of Nematoda, 454 

 Rhabdocoela, 102, 115 

 Rhabdocodida, 102 

 Rhabdome, formation of, iu eye of Affcfem/, 



233, 234 ; in compound eye of Ax/m-nti, 



189 ; in compound eye of Dytiscus, 276 

 Rhagon of Oscurella, 44 

 Jt/ti:m:ri/ti(.i, 559, 560 

 Rhyncobdellidae, 128, 161, 284 

 Ribs of Bertie, formation of. 92 

 Right anterior coelom of larva of Aster i <s 



467 ; of larva of />///, //<\ esculenttis, ">09 ; 

 of larva of Ophiothrix fragilis, 490 



Right hydrocoele, development of, in larva 

 of Asterias, 466 ; in larva of Asterinn 

 ififi, 474; in larvae of Echinus escu- 

 and Echinn.1 miJiiiris, 528; in 

 larva of Ophiothrix fragilis, 491 

 Right madreporic pore in larva of Axtrritix, 



465 



Right posterior coelom of embryo of A ntedon 

 rosacen, 547 ; of larva of Asterias, -l'!7, 



468 ; of larva of Eclii/tn.i esculentus, 509 ; 

 of larva of /;////////.< r',-n</i!i.i, 490 



Right ventral horn of left posterior coelom 

 in larva of Axtrriiis, 468; in larva of 

 Axt'-i -iiin i/i/ifnisii, 471 ; in larva of 7v7/ ////'.> 

 esculentus, 514 ; in larva of i>/,/n'n///ri.'- 

 fragilis, 494 



Ring muscles of larva of I'lJiii/m-dins <tfi- 

 pendiculatus, 148 



Ring-sinus, formation of, of larva of . I /'< //". 



71 



i;i]- ovum, definition of, 9 



Rosette-cells in embryo of l'<itrlln, 'J'. 1 1 : 



formation of, in embryo of 



133 

 Rosette plat' 1 , formation of. 



rosacea, 558 



l;.i-li-al spine of Ax/urns, 189; of'Proto/oa.a 



larva of Penaeiis, 203 

 Kotiu-ra, development of, 418-427 

 Rnfrle of spermatozoon, definition of. 7 



