638 



NDEX 



Radial perihaemal vessel, 550; 561, 



563, 567, 580 

 Radial spiral cleavage, 248 

 Radial symmetry, 557; of Coelente- 



rata, 123, 125, 130, 159; of Echino- 



dermata, 123, 546, 557 

 Radial water vessel, see Water 



vascular system 

 Radii of Echinodermata, 547 ; 570, 



573 



Radiolaria, 71 ; 36, 38 



Radula, 484 ; 47 1 , 476, 477, 489, 490, 

 492, 494, 495, 496, 499, 519 



Radula sac, 484 



Receptaculum seminis, see Sperma- 

 theca 



Rectal caeca, 560 



Rectum, see Alimentary canal 



Reduction division, 23, 32, 83 



Regeneration, in Crustacea, 303 ; in 

 Turbellaria, 188 



Regular sea urchins, see Endocyclica 



Relation of Protozoa to the Environ- 

 ment, 35 



Relicts, 352 



Renal openings (apertures, papi liar) 

 of Mollusca, 47 1 , 476, 483 , 490, 517 



Renopericardial openings (aper- 

 tures, canals), 483; 499, 518 



Repeated fission of Protozoa*, 24; 

 40, 48, 51 



Reproduction, of Metazoa, see 

 Asexual reproduction. Sexual re- 

 production; of Protozoa, see Fis- 

 sion 



Reproductive aperture, see Genera- 

 tive organs 



Reproductive organs, see Generative 

 organs 



Reserve materials, 15 



Respiration, of Arthropoda, 278 ; of 

 Crustacea, 3 1 1 ; of Cyclops, 334 ; of 

 Lamellibranchiata, 503 ; of Proto- 

 zoa, 16; of Tubicolous Polychaeta, 

 235. See also Respiratory move- 

 ments. Respiratory organs 

 Respiratory movements, of Aphro- 

 dite, 233; of Arachnida, 445; of 

 Branchiopoda, 387; of Carcimis, 

 366 ; of Crustacea, 3 1 1 ; of Cyclops, 

 334; of Insecta, 392; of Mysis, 

 353; of Pulmonata, 482; of 

 Tubicolous Polychaeta, 237 ; of 

 Tnhifex, 260 



Respiratory organs, of Arachnida, 

 445 ; of Arthropoda, 278 ; of 

 Branchiopoda, 317; of Chaeto- 

 poda, 230 ; of Crustacea, 311; of 

 Echinodermata, 552; of Holothu- 

 roidea, 575 ; of Lamellibranchiata, 

 503 ; of Ligia, 355. See also Gills, 

 Lungs, Tracheae 



Respiratory trees, 553, 575 



Resting eggs, 213. See also Winter 

 eggs 



Resting phase of Phytomastigina, 42 



Rete mirabile, 575 



Retinaculum, 429 



Retinulae, 274, 277 



Retractor muscle(s), of penis, 486 ; 

 of proboscis, 205; of stomach; 

 560; of tentacles, 573 



Retral processes, 71 



Retropharyngeal band, 594 



Rhahdammina , 7 1 ; 8 



R. ahyssorum, 9 



Rhabdites, 178 



Rhabditis, 215; 216, 217, 220, 221 



Rhabditoid larva, 221 



Rhabdocoelida, 189 



Rhabdoliths, 46 



Rhabdom, 277 ; 274 



Rhabdomeres, 274; 276 



Rhabdopleura , 590; 583, 585 



R. normani, 589 



Rhipicephalus, 465 



Rhipidoglossa, 489 



Rhizocephala, 343 



Rhizochrysis, 44 ; 46 



Rhizocrinus, 582; 581 



Rhizomastigina, 56 ; 63 



Rhizoplasts, 11 



Rhizopoda, see Sarcodina 



Rhizopodia, 11 



Rhizostoma, 156 



Rhizostomeae, 156 



Rhombifera, 582 



Rhyacophila, 427 



Rhynchobdellidae, 267; 263, 264 



Rhynchocoel, 205 

 Rhynchodaeum, 207 

 Rhynchodemus terrestris, 190 

 Ring canal of Polyzoa, 530 

 Rings (Nervous, Water vascular, 

 etc.) of Echinodermata, 547; 550. 

 See also Nervous system. Water 

 vascular system, etc. 

 Ripe proglottis, 199; 201 



