580 



INDEX OF SUBJECTS. 



Cow, variation in number of teats, 188 



Crab, extra parts of appendages, 527 — 

 536 ; variation in segmentation of ab- 

 domen, 95 



Crateronyx, extra wing, 285 



Crayfish, variation in number of gene- 

 rative openings, 152 ; repetition of 

 parts of chelae, 529, 532, 537; extra 

 parts in antennas, 538 



Cribrella, abnormal branching of an arm, 

 440 



Crinoids, radial joints, 421; variation in 

 number of rays, 435 ; 4-rayed varieties, 

 436 ; 6-rayed varieties, 437 ; 3-rayed 

 and 5-rayed varieties of a 4-rayed 

 form, 437; variation in number of 

 canals in stems, 438; abnormal 

 branching, 438 



Crista, division of embryos, 556 



Crossarchus, teeth, 227—231 ; zebra, 230, 

 231 



Crustacea, theory of descent of Yerte- 

 brata from, 29 ; of salt lakes, 100 ; 

 Secondary Symmetry in, 525; Homce- 

 osis in, 149 



Cryptohypnus riparivx, extra legs, 509 



Cryptophagus scanicus, dentatus, double 

 (?) antenna, 550 



Ctenodrilus, double tail, 565 



Cucumaria planei, with six radii, 433; 

 double monster, 566 

 aciculi, double monster, 566 



Cnon, one lower molar absent, 209 



Cupressocrinus, imperfect variation to 

 4-rayed state, 437 ; variation in num- 

 ber of canals in stalk, 438 



Curve of Frequency of Variations, 37, 64 



Cuvierian organs, variation in number of, 

 435 



Cj'clopia, 458 



Cygnus olor, cervical vertebras, 33 ; colour- 

 variation of young, 44 ; atratus, 

 brachial plexus, 130 



Cyllo leda, variability of ocelli, 289 



Cyncelurus, teeth, 222, 224 



Cynocephalus jyorcarius, extra molar, 204 



Cyprinus carpio, bulldog-headed varie- 

 ties^?; hungaricus, ditto, 58; auratus, 

 division of fins, 451 



Cyprus, 4-horned sheep, 285 



Cypselus, brachial plexus, 131 



Cystophora cristata, premolars, 238; 

 molars, 243 



Dachshund, hallux in, 401 ; duplicity of 



hallux and pollex, 401 

 Dactylopodites. extra, 528 

 Dactylopsila, premolars, 255 

 Darwin's solution of problem of Species, 



5; views on Reversion, 77; on sudden 



Variation in eye-spots, 289 

 Dasyuridas, incisors, 247 

 Daayurua, incisors, 247 ; premolars, 255 ; 

 molars, 256 



Dasyurus, viverrinus, variation in molars,. 

 256 

 maculatus, molars, 256 

 Deilephila euphorbia*, colours of larvae, 



305; hippophaes, 305 

 Dendarus hybridus, extra antennas, 523 

 Descent, Doctrine of, assumed to be 



true, 4 

 Diaptomus, colour-variation of eggs, 



44 

 Dicotyles torqaatus, incisors, 245 

 Didolphyidae, incisors, 246 

 Didelphys, teeth, 246, 258 

 Digits, Variation of 



Mammals. Capreolus, 374 ; Cat, 



313; Cervus, 379; Dogs, 401; 



Erinaceus, 397; Elephas, 397; 



Goat, 377; Herpestidas, 346; 



Horse, 360; Hylobates, 346; 



Macacus, 340; Man, 324; Mule, 



360, 370; Ox, 374, 383; Pig, 



381, 387; Sheep, 373, 380 



Birds. Anas, 392; Aquila, 393; 



Archibuteo, 392; Buteo, 393; 



Fowl,390;La/'us,393; Pheasant, 



393; Rissa, 396; Turkey, 393 



Reptiles. Chalcides, 395 ; Cis- 



tudo, 396 



Reduction in number, Man, 355, 



358 ; Artiodactyla, 383 

 Union of, Ox, 383; Pig, 387 ; Man, 355 

 Variation in, associated with other 



variations, 399 

 Inheritance of Variation in, 398 

 Recapitulation of evidence, 400 

 Dimorphic condition, its relation to the 



monomorphic condition, 37 

 Dimorphism in Spinal nerves, 138; in 

 position of generative openings in 

 Pachydrilus, 165, 168 ; in secondary 

 sexual characters, 38 

 Diopatra, abnormal repetition, 159 

 Discoidea (Echinid), 4-rayed specimen, 



442 

 Discontinuity of Species, 5 



in Variation, a possibility, 

 17 ; suggestion as to its 

 nature, 68, 568 

 in chemical processes, ] 6, 



48, 72 

 in colour-variation, 43, 48, 

 72; in colour-patterns, 

 48 

 in states of matter, 16 

 of Meristic Variation per- 

 haps mechanical, 70 

 of Substantive Variation 

 perhaps in part chemi- 

 cal, 71 

 in the Variation of spinal 



nerves, 145 

 in the Variation of the 

 generative organs of 

 Annelids, 168 



