80 



INDEX 



Scolex, 53. 



Scolopendra, 56. 



Secretion, in metazoa, 17; in Parame- 



cium, 14. 



Segmentation, of frog's egg, 42. 

 Seminal receptacles, of earthworm, 27, 



30, 34. 



Seminal vesicles, of earthworm, 27, 34. 

 Sepia, 55. 



Septum, in Cephalopoda, 70; in earth- 

 worm, 27, 29; in segmented muscle, 



16. 



Setae, 54; of earthworm, 26, 54. 

 Sheath, of Bugula, 30. 

 Shoulder girdle, 47; of man, 47; of pigeon, 



48. 



Silurian, 71. 

 Siphon, 63, 64, 71. 

 Siphonops, 58. 

 Siren, 58. 

 Sistrurus, 59. 

 Skull, of fossil horses, 73. 

 Solen, 54. 

 Somatic cells, in earthworm, 29, 30; in 



Hydra, 25, 26; in Pleodorina, 24; in 



Volvox, 24, 25;,number of cfrrc>mGS>>mes f 



42. 



Somite, of earth worm, 2ft r * u < 

 Species, 61. ;\ ; ',/' vH t < 

 Spermary, in Hydra, 26. 

 Spermatid, 40. 

 Spermatocyte, primary, 40; secondary, 



40. 



Spermatogonium, 40. 

 Spermatozoa, maturation of, 40; of As- 



caris, 41; of Hydra, 26; of Obelia, 31, 



36; of Volvox, 24, 25. 

 Sphenodon, 59. 



Spinal cord, of frog embryo, 43. 

 Spindle, in mitosis, 20. 

 Spindle fibers, 22. 

 Spiracle, of frog tadpole, 44. 

 Spireme, coarse, 20, 21; fine, 20, 21. 

 Spongin, 52. 



Spore, of Monocystis, 33. 

 Spore formation, in Monocystis, 33. 

 Squamata, 59. 

 Squamosal, 60. 

 Stalk, of Carchesium and Zoothamnium, 



23. 



State monographs, 61. 

 Stimuli, 16, 66. 

 Stratum corneum of frog skin, 8. 



Striations, in muscle, 16. 

 Subepithelial cells, in Hydra, 25. 

 Subumbrella, of Obelia, 31. 

 Sucker, of frog tadpole, 43; of leech, 54; 



of tapeworm, 53. 

 Summary, 3. 

 Supplies, 1. 

 Suture, in cephalopod shell, 70-72; in 



turtle skull, 60. 

 Synapsis, in Ascaris, 41. 

 Systematic treatises, 60. 



Tadpole, of frog, 43. 



Tail, of frog tadpole, 43. 



Tapeworm, 53. 



Tarsals, 47; of frog, 48; of man, 47. 



Tarso-metatarsus, of pigeon, 49. 



Taxonomy, 51. 



Teeth, of fossil horses, 73. 



Telophase, 20, 22. 



Tentacles, of Gonionemus, 52; of Hydra, 



33; of Obelia, 30. 

 Terrigenous bottoms, 62. 

 Testis, of frog, 37; of Hydra, 26. 

 Testudinata, 58, 59. 

 Testudinidse, 60. 

 Tetrad, in Ascaris, 41. 

 Thamnophis, 59; T. butleri, 67; T. radix, 



67. 



Thermotaxis, 66. 

 Thigmotaxis, 66. 

 Tibia, 47; of man, 47. 

 Tibio-fibula, of frog, 48. 

 Tibio-tarsus, of pigeon, 49. 

 Tissues, 16. 

 Triassic, 71. 

 Trichinella, 54. 

 Trimerotropis maritima, maturation of 



spermatozoa in, 40. 

 Trionychidse, 60. 

 Triploblastic, 53. 

 Triton, 58. 

 Tube-feet, 54. 

 Typhlosole, of earthworm, 29. 



Ulna, 47; of man, 47; of pigeon, 48. 

 Unsegmented egg, of frog, 42. 

 Ureter, of frog, 37. 



Uterus, of Ascaris, 21; of frog, 37; of 

 mammal, 38. 



Vacuoles, food, in Amoeba, 11; food, in 

 Paramecium, 15; in Hydra, 10; pul- 



