294 



SUBJECT INDEX 



Maturation, 71-76; Plate II; see oocyte and 

 polar bodies; cytoplasmic maturation, 



75 



Maturity and size, 36 



Mechanical shocks, or stimulation, chro- 

 matophores, 159; cleavage, 161; cytolysis, 

 171; parthenogenesis, 198; susceptibility, 

 220; viscosity, 225 



Medicine, 11, 13, 20, 24 



Membranes and layers of egg, 83; Figs. 9, 

 10; list of diagrams, 85 



Mercuric chloride, chromatophores, 159; 

 cleavage, 164 



Merogones, see Hybrids, 184; homospermic, 

 184, Plate X, XVI, 12, 15; heterospermic, 

 184; parthenogenetic, 140-141, Plates XI 

 and XVI, 13 



Mespilia globulus, development, 18, 117; 

 gonads, 31; classification, 64; size of egg, 

 64; oogenesis, 71: chromosomes, 102; 

 see Compilation, Other Species 



Metabolism, see Respiration 



Metal salts, cleavage, 164 



Metamorphosis, 18, 19, 115-117; Plate VI; 

 Other Species, 18, 117 



Metaphase, 96; Plate XVI, 11, 12, 13 



Methylated xanthine, on cortical layer, 

 168 



Micromanipulation, fading of cleavage 

 figure, 104; cortical layer liquefied, 167; 

 hyaline layer, 183 



Micromeres, 76, 105-107, 138, 139, 158; 

 Plate VIII, 5, 6, 15, 16; pressure, 211 



Micropyle, 76, 82-83, 138 



Microsomes, 85, 160 



Mid-bodies, 101; in Rhomaliutn, 101 



Migration of sea urchins, 43 



Miquel's solution, 35, 113 



Mitochondria, see Compilation, 192; im- 

 mature egg, 71, 74; mature egg, size and 

 amount, 85; mature egg centrifuged, 

 125; stain, 126, Table 8; in sperm, 89 



Mitochondrial (granular) quarter-egg, 129; 

 Table 9; Fig. ^12, Plate VII; develop- 

 ment, 143 



Mitotic cycle, see Rhythms of susceptibility 



Mitotic figure, 96, 97; of whole and half 

 eggs, Plate XVI, 11-15; visibility, 103; 

 structure, 103; fading out, 103-104; iso- 

 lation, 104; anaesthetics, 151; hydro- 

 static and mechanical pressure, 151; 

 oxygen-lack, 151 

 Monaster, 96, Plate III, 5, Plate V, 3; with 

 anaesthetics, 151; chromatophores, 158 

 Morphine, cleavage, 164 

 Morphology, 14, 16, 30-34; literature, 31, 



34; Figs. 4, 6, 7, Plate I 

 Mosaics, 25 



Multi-astral and multi-nucleate eggs, 140, 



Plate X; 141, Plate XI; 143, 144 

 Mustard gas, see Nitrogen mustards 



Names for sea urchins, in English, Latin, 

 Greek, Italian, French, German, Spanish, 



3-7 



Naphthoquinones, cleavage, 164; respira- 

 tion, 215, 216 



Narcotics, see Anaesthetics 



Necrosin, cleavage, 164 



Nereis, periodicity, 57 



Nickel chloride, exogastrulation, 190 



Nitrogen, see Compilation, 193; in late 

 eggs, 149; in eggs, 166; pressure, 211 



Nitrogen mustards, micromeres, 106; cleav- 

 age, 164; phosphorus metabolism, 207; 

 respiration of eggs, 216; of sperm, 218; 

 rhythms, 220; viscosity, 225 



Nitrophenols and nitrocresols, see Phenols 



Nitrous oxide, cleavage, 164; nuclear divi- 

 sion without cell division, 193; pressure, 

 211 



Nitzschia closterium, 35, 113 



Nomenclature, 3-7 



Nuclear division without cell division, see 

 Compilation, 193 



Nucleases, 177 



Nucleic acid, see Nucleoproteins 



Nucleolini, 72, 73 



Nucleolus in immature egg, 72, 73; ultra- 

 violet, 72; RNA, 73; gravity and cen- 

 trifugal force, 74; density, 173; lipids, 

 189 



Nucleoproteins, see Compilation, 194-195; 

 see also Proteins and Phosphorus metab- 

 olism; RNA in nucleolus, 73; DNA in 

 nucleus, 81; DNA and RNA in sperm, 

 88, 89, 103; RNA in cortex of egg, 168 



Nucleus, size, 79, 81; aberrant size, 80; 

 structure, 81; dyes and stains, 81; ultra- 

 violet, 81; size in hypo- and hypertonic 

 sea water, 81, Table 11; Plate XIV; en- 

 largement and breaking of membrane, 

 96; Plates III 7, V 4, 5; density, 173; 

 viscosity, 224 



Ocular plates, 30; Fig. 6 



Oil, see Compilation, 195-196; see also 

 Lipids; in immature egg, 71, 74; itj ma- 

 ture egg, size and amount, 85; in cen- 

 trifuged egg, 125; Fig. 12; Plate VII; 

 stain, 126, Table 8 



Oil coalescence, 149, 196 



Oil companies, 20, 39 



Oil-protoplasm, see Oil coalescence 



Oil-water, see Oil coalescence 



Oocyte, growth and differentiation, 71; 



