INDEX 



Acardia, 149-54 



Acardii: acephali, 153; acormi, 



152, 154; amorphi, 153, 154; 



completi, 151 

 Agametic non-axiate reproduction, 



213 

 Allolobophora foetida, 30; A. sub- 

 nib icunda, 31, 32; A. trap- 



ezoides, 30-32 

 Alternation of generations and 



twinning, 216, 217 

 Amblystoma, 194-200 

 Amphioxus, twinning in, 98, 99 

 Anadidymi: in birds, 83; in 



fishes, 43, 45, 46; in starfish 



larvae, 23, 24; in turtle, 95 

 Androvandus, U., 38 

 Arey, L. B., 130-32 

 Assheton, 108, 129 

 Autosite and parasite twins: in 



birds, 87, 88; in fishes, 45, 46; 



in man, 155; in starfishes, 26, 27 

 Axiate reproduction, 208-12 

 Axolotl, paedogenesis in, 214 



Barbieri, C, 42 



Barfurth, 98 



Bateson, W., 3, 94, 95, 193, 194, 



200-202 

 Bellamy, A. W., viii, 93 

 Bilaterality in echinoderm larvae, 



179-83 

 Blastotomy: physiological, 16; 



theory of twinning, 126 

 Bruch, 95 



Bryce-Teacher ovum, 128 

 Bryophyllum, 62 

 Budding: theory of twinning, 55, 



108-20; lateral, 211 



Chelonia, 95-97; breeding habits 

 of, 95, 96; minimal twinning in, 

 96-97 



Child, C. M., 61 



Concrescence theory, and inter- 

 pretation of twinning, 55-60 



Conjoined twins: classification of, 

 in fishes, 43, 44, 51-72; inter- 

 influences of, in man, 154-58; 

 mode of origin, in man, 121- 

 26 



Cosmobia: in birds, 82-84; in 

 man, 121, 122 



Coste, M., 38, 67 



Crowding, a cause of twinning in 

 Patiria, 15 



Cyclopia, 162, 191 



Cyclopian monster, 1 24 



Cyclostomata, 98 



Cyprinus aurakis, 191 



Dareste, C, 7, 73-78, 82, 125 

 Dasypus hybridus, i, 212 

 Dasypus novemcinctus texanus, 100, 



212 

 Davenport, C. B., 133, 134 



Determinate cleavage, relation to 

 twinning, 3, 4 



Detwiler, S. R., 205 



Dichotomy, a synonym for twin- 

 ning, I 



Diplopagi, 123 



Dizygotic twins, vii 



Dohrn, A., 98 



Double hands and feet in man, 



200-202 



Double limbs, experimental pro- 

 duction of, 194-200 



227 



