SUBJECT INDEX 



297 



Sperm aster, 96 



Sperm extracts, agglutination, 92; cleav- 

 age, 165; enzymes, 177; parthenogenesis, 

 200 



Sperm head, size and stain, 87; chromo- 

 somes, DNA, 88, 103; rotation, 95 



Sperm middle piece, 87, 88; stain, 88; 

 isolation, 89 



Sperm tail, 87, 89 



Sphaerechinus granulans, as food, 22; ma- 

 ture, 36; phototaxis, 43; decorates itself, 

 44; sex dimorphism, 48; hermaphrodites, 

 51; lunar periodicity, 56; classification, 

 66; egg size, 66; first cleavage, 99; many 

 references in Compilation, mostly under 

 Other Species after each topic 



Spines, use, 9, 46; number, 16; fossil, 20; 

 size and shape, 27, 28, 32; pigment, 28; 

 tubercles, 30 



Staff elei, 17, 18 



Stored eggs (in aquarium), 54 



Storm forecast by pebbles on sea urchin, 

 11, 12, 13; Fig. 3 



Stratification, in immature egg, 74, 76; 

 Plate II, 13-15; and polarity, 76, 128, 

 138; mature egg, 125, 126; Fig. 12; Plate 

 VII; staining, 125-126; Table 8; other 

 eggs, 127; with different forces, 131; 

 Plate XIII; in hypo-hypertonic sea 

 water, 131; Plate XIV; in different salts, 

 132; Plate XV; effect of temperature, 

 pressure, radiation, 133 



Streak stage, 96, Plate III. 6, 7; Plate V, 4 



Strongylocentrotus drobachiensis , as food, 

 23, 25; albinos, 29; rock boring, 39; 

 hermaphrodite, 51; general, 59; egg, 59, 

 65; centrifuged egg, 59, 60, 127; clas- 

 sification, 65; blastocoel, 109; many ref- 

 erences in Compilation, mostly under 

 Other Species after each topic 



Strongylocentrotus franciscanus, as food, 

 23; classification and egg size, 65; first 

 cleavage, 99; see Compilation, Other 

 Species 



Strongylocentrotus intermedius, classifica- 

 tion, 65; chromosomes, 102 



Strongylocentrotus (Hemicentrotus) pul- 

 cherrimus, development, 18, 117; plates 

 and size, 31; decorates itself, 44; sex 

 dimorphism, 48; classification and egg 

 size, 65; refertilization, 107; fertilization 

 after parthenogenesis, 108; see Part IV, 

 Other Species 



Strongylocentrotus purpuratus, as food, 23; 

 rock-boring, steel-boring, 39; classifica- 

 tion and egg size, 65; forced shedding, 

 55; echinochrome on sperm, 91; KCN 



on sperm, 91; number of sperm, 94; first 

 cleavage, 99; lecithin, 189; lithium, 190; 

 many references in Compilation, mostly 

 under Other Species after each topic 



Strontium, on chromatophores, 159 



Structure of unfertilized egg, 81; Plate III, 

 1 and Plate V, 1 



Sugar (sucrose), see Carbohydrate; amount 

 for centrifuging, 121, 196; amoeboid eggs, 

 150; chromatophores, 159; cleavage, 165; 

 parthenogenesis, 200 



Sulphanilamide, cleavage, 165 



Sulphide, sodium, cleavage, 165; on cyto- 

 chrome oxidase, 171 



Sulphydryl group (PCMB, 91), sperm 

 motility, 91; polyspermy, 209 



Sulphur, S*^, cleavage, 166 



Supersonic sound waves, see Ultrasonic 

 waves 



Superstition, see Storm forecast 



Surface forces, see Tension at the surface 



Surface layers of egg, see Layers 



Surface precipitation reaction, anaesthet- 

 ics, 151; calcium, 155; chromatophores, 

 >59; Mg, 191; KCl. 209 



Surface tension, see Tension at the surface 



Susceptibility, see Rhythms of 



Swimming rate, sperm of Arbacia and 

 other species, human sperm, Paramoe- 

 cium, gastrula, man, 90 



Teeth, 9, 30, 32, 33 



Telophase, 96 



Temnopleurus plates and size, 31; sex 

 ratio, 47; sex dimorphism, 47; classifica- 

 tion, 64; egg size, 64 



Temperature, cleavage figure, 104; stratifi- 

 cation and breaking, 133; amoebocytes, 

 150; carbamate narcosis, 153; chroma- 

 tophores, 159; cleavage, 161, 163; cya- 

 nides, 169; cytolysis, 171; nuclear and 

 cell division, 193; parthenogenesis, 198; 

 phosphorus metabolism, 207; pressure, 

 211; respiration and cleavage, 217; 

 rhythms, 219; viscosity, 225; Tables 3, 



4. 19 

 Tension at the surface. Surface forces. 



Surface tension, see Compilation, 222- 



223 

 Tertiary, 20 

 Test, size and shape, 27-28, 36; Plate I; 



Figs. 6, 7; increase in size, 30-31, 37-38; 



pigment, 28 

 Testis, see Gonad 

 Tetrapygus niger (Echinus niger, Arbacia 



niger, 5; classification, 64 

 Theobromine and Theophylline, cleavage, 



166 



