SUBJECT INDEX 



293 



Hedgehog, 3, 4, 5, 13; Fig. 1 



Heliocidaris crassispina, development, 18; 

 sex determination, 49; classification, 65- 

 66; egg size, 66 



Helium, pressure on cleavage, 211 



Hemiaster (Abatus), sex dimorphism, 48; 

 brood pouch, 52; classification, 67; egg 

 size, 67 



Heparin, cleavage, 164, 165; fertilization 

 membrane, 181; viscosity, 225 



Herissojx, 3, 4 



Hermaphrodites, 50-51; list, 51 



Hipponoe, see Tripneustes 



Historical, 8-19; embryology, 17 



Holothuroidea, 14 



Homogenates, methods of preparation, 

 122-124; centrifuged, composition of 

 layers, 122; Table 7; chromatopliores, 

 159; cytochrome oxidase, 171 



Hyaline layer, see Compilation, 182-183; 

 83; Fig. 10; 96, 97; centrifuged off, 145; 

 Plate XVI, 6; in Ca-free sea water, 155, 

 183; Plate XVI, 9; with KCl, 209 



Hyaloplasmic layer, see Hyaline layer 



Hybrids, see Compilation, 184-185; arm 

 skeleton, 110 



Hydrocarbons, carcinogenic, cleavage, 161 



Hydrogen ion concentration, see Compila- 

 tion, 185-186 



Hydrostatic pressure, see Pressure, hydro- 

 static 



Hypo-hypertonic sea water, germinal vesi- 

 cle, 75, 81; nucleus, 81; centrifuging, 

 131, Table 11, Plate XIV; amoebocytes, 

 150; amoeboid eggs, 151; chromato- 

 phores, 159, twins, 223 



Hypsiechinus coronatus, brood protecting, 

 52; classification, 64 



Immature eggs, electrical method, 49; oc- 

 currence, 52; see oocyte 

 Impedance, electrical, 175, 176 

 Infrared light, see Compilation, 187 

 Injury substances, parthenogenesis, 200; 



permeability, 205; viscosity, 226 

 Ink, made from sand dollar shells, 25 

 Interambulacral plates, see Ambulacral 



plates 

 Interfacial tension, see Oil coalescence 



and tension at the surface 

 Intravitam dyes, see Vital dyes 

 lodoacetate, lodoacetic acid, on plutei, 



112; carbohydrates, 157; cleavage, 164; 



respiration, 216 

 lodosobenzoic acid, chromatophores, 159; 



fertilization membrane, 181 

 Iron in eggs, 166 



Jelly layer, see Compilation, 187-188; in 

 immature egg, 72; in mature egg, 82, 

 83; Plate XVI, 3; Figs. 9, 10; destroyed, 

 82; stain, 82; Table 8 



Jewelry, 26 



Jewstones, Judeo de incr, lapides judaici, 

 4. 20, 24 



Koehler's window technique, 55 



Laminaria, 35 



Lamps, 25 



Lantern, see Aristotle's lantern 



Late eggs, 54 



Latin, 3 



Layers (surface) of egg, 83; Figs. 9, 10; 

 list of diagrams, 85; in centrifuge tubes, 

 129, Plate VII, 10; centrifuged eggs, see 

 stratification 



Lentulus, supper of, 22 



Leucocytes, see Compilation, 188-189 



Lich mophora, 1 1 3 



Life, duration in Echinus esculentus, 37 



Lipids, see Compilation, 189; see also Oil 



Lithium, see Compilation, 190 



Lobsters, 41 



Lipophanerosis, 195 



Locomotion, 45, 46; Reaumur, 46; by lan- 

 tern, 46 



Longevity of egg, see Compilation under 

 Ageing, 149; see also chloral hydrate, 

 153; Ca, 156; KCN, 169; oxygen-lack, 

 197; of sperm, amino acids, etc., 91-92; 

 KCN, 170; of fertilization membrane, 

 180 



Low oxygen tension, see Oxygen-lack 



Lunar periodicity, 10, 11, 13, 56-57 



Lytechinus anamesus, sex dimorphism, 48; 

 classification, 65; egg size, 65 



Lytechinus pictus, sex dimorphism, 48; 

 classification, 65; egg size, 65; sperm, 89 



Lytechinus (Toxopneustes) variegatus, 

 white, 9; decorates itself, 11, 44; fossil, 

 21; reaction to light, 43; locomotion, 45; 

 renewed ovaries, 55; classification, 2 sub- 

 species, 65; egg size, 65; oocyte, 72, 73; 

 number of sperm, 94; development, 95; 

 first cleavage, 99, 101; sperm tail, 100; 

 mid-bodies, 102; chromosomes, 102; blas- 

 tocoel, 109; jelly, 188; lithium, 190; 

 many references in Compilation, mostly 

 under Other Species after each topic 



Madreporic plate, 30, Plate I and Fig. 6 

 Magnesium, see Compilation, 191 

 Malonic acid, cleavage, 164 

 Malononitrile, cleavage, 164; phosphorus 

 metabolism, 207 



