478 



SUBJECT INDEX 



Neurocords, 54-55 



Nissl bodies, 50 



Non-metameric section of metasoma, 1 7 



Oligomerization, of non-metameric papil- 

 lae, 24 

 Oligomerization, of tentacles, 25-26 

 Oocytes, 100 

 Oogenesis, 100 

 Organogenesis, 109, 112 

 Orientation of body, 7-8 

 Oviducts, 98, 100 

 Ovifunnel, 101 

 Ovaries, 98 



Panic withdrawal, 55 



Papillae, 18 



Papillae, adhesive, 17 



Papillae, function, 17 



Papillae, genital, 20 



Papillae, histology, 45-49 



Papillae, metameric, 7 



Papillae, metamerism, of, 21-25 



Papillae, multicellular glands, 38, 40-41 



Papillae, postannular, 20 



Papillae, thickened, see Zone of thickened 

 papillae 



Parapodia, 17 



Parenchyma, 65 



Pericardium, 60, 74-76 



Peritoneal cells, 66 



Peritoneal epithelium, 59, 64, 71 



Peritoneum, 65, 72 



Photoreception, 126 



Phylogeny, 132, 140 



Pinnules, 31, 79, 80, 86, 87, 140, 141 



Pinnules, capillaries of, 73 



Pinnules, ontogeny, 83 



Plaques, 17, 20, 24-25, 36, 47-48 



Plaques, adhesive, 36 



Plaques, cuticular, 17 



Platelets, toothed, 18-19,37, see also Girdles 



Polychaetes, resemblance to, 8 



Polysaccharide in cuticle, 35 



Polysaccharides in gland cells, 33 



Polysaccharides in multicellular glands, 40 



Population density, 123 



Postannular section, 19-20 



Postembryonic development, 119 



Post-tentacular region, glands of, muscula- 

 ture, 40, 41, 43 



Preannular region, 17-18 



Preoral lobe, 1 1 



Pretentacular groove, 12 



Proboscis, 11 



Proboscis pores, 67 



Protocoele, 59, 63 



Protocoele, late embryology, 63 



Protosoma, 11-13, 25 



Protosoma and brain, 50 



Protosoma, coelom of, 59-63 



Protosoma, epidermis, 32 



Protosoma, innervation, 51-53 



Protocoelomoducts, see protosomal coelo- 

 moducts 



Protocoele and pericardium, 75 



Protosomal coelomoducts and excretion, 

 66-70, 71 



Proximal canals of coelomoducts, 67 



Pseudometamerism, see Metamerism secon- 

 dary 



Pulvilla, 25, 47-48 



Pyriform glands, 59 



Relationships, 132 



Renal sac, 71 



Reproduction, 90 



Reproductive system, see Genital system 



Respiration, 85 



Schlerotin, 122 



Segmentation, 11, 116 



Sense organs, 50, 58 



Sensory cells, 32, 58 



Shields, dorsal glandular, 20, 33, 41 



Siboga expedition, 3 



Size, 8-10 



Somatopleura, 59, 65, 66 



Sperm, 93 



Sperm sac, 90 



Spermatogenesis, 93 



Spermatogonia, 93 



Spermatophores, 96, 97 



Spermducts, 94 



Splanchnopleura, 64, 66 



Splanchnopleura, excretory function, 66 



Stomodaeum, 119 



Systematic position, 4, 5 



Teeth, 18-19 



Tentacle rudiments, 112, 115-116 



Tentacle, 103 



