INDEX OF SUBJECTS. 



581 



Discontinuity iu the Variation of digits, 



407 

 in Meristic Variation of 



Radial Series, 423 

 partly dependent upon 



Symmetry, 568 

 Discontinuous Variation, use of the term, 



15 



Disease, analogy with Variation, 74 

 Ditonnm tricwpidatus, double (?) an- 

 tenna, 550 



Division of organs, a process of repro- 

 duction, 193 



of teeth, 268; of mamma?, 193; 

 of digits, 349, 369; of ten- 

 tacles, 280 ; of radius of 

 Echinid, 446; median, 454 

 Dog, cervical rib, 122 ; hairless, 57 ; bull- 

 dog, 210, 221; digits, 401; nipples, 

 189 



teeth, 209222 ; incisors, 210 ; 

 canines, 211 ; premolars, 213, 

 215; molars, 220; deficiencies in 

 Esquimaux, 215; in Inca, 216 

 Dog-whelk, colour-variation, 48 

 Domestication, variability falsely ascrib- 

 ed to, 266, 401 

 Donacia bidnns, Variation in antennae, 



413 



Dorcadion rutipes, extra legs, 512 

 Dorking Fowl, digital variations, 390 



395 

 Dorocidaris papillata, variation in pedi- 



cellariae, 429 

 Double-foot, Artiodactyles, 378 ; Frog, 



540; Macacus, 340; Man, 337, 338 

 Double-hand, 325, 331 

 Double Monsters, 559 

 Double-thumb, 349 

 Dromceolus barnabita, extra antenna?, 



523 



Duck, no variation in number of digits 

 recorded, 401 ; cases of absence of 

 webs between toes, 401 

 Duplicity of single members of series not 

 distinct from other modes 

 of addition, 193, 407 

 of appendages, 406 ; in Arthro- 

 poda, 539; in Vertebrata, 

 539 



axial, 559 

 Dutch pug, 57 



Dyschirius f/lobulostis, extra legs, 512 

 Dytitscus majginalis, extra legs, 512 



Eagle, extra digits, 393 



Ears, repetitious of, known as cervical 

 auricles, 180 



Earthworms, variation of generative 

 organs, 159 ; of segmentation, 157 ; 

 asymmetrical arrangement of genera- 

 tive organs, 160, 161 ; table of arrange- 

 ment of ovaries, 162; duplicity of 

 head, 565, of tail, 565 



Earwig, variation of forceps, 40 ; of 

 antennary joints, 413 



Echinuconus, 4-rayed specimen, 441 ; 

 alleged case of 3 rays, 441 



Echinodermata, Meristic Variation in, 

 432; variations of pedicellariae, 429; 

 duplicity, 



Echinoidea, Meristic Variation of, 441 ; 

 4-rayed specimens, 441; partial dis- 

 appearance of a ray, 443 ; partial 

 duplicity of a ray, 446; 6-rayed speci- 

 men, 445; pedicellariae, 429; variation 

 in number of genital pores, 446 ; sym- 

 metrical reduction of two rays, 443 



Echinus nielu, partial reduction of an 

 ambulacrum, 443 



Echinus sphcera, partial reduction of an 

 iuterambulacrum, 445 



Ectrodactylism, Man, 355, 358 



Elate r murinus, extra antennas, 522 ; 

 rariubilis, extra leg, 547 ; hirtus, 

 double (?) antenna, 551 



Eledune, supernumerary hectocotylus, 

 473 



Eleodes pilosa, double (?) antenna, 551 



ElepJtas, tusks, 244; hoofs, 397 



Elytra, said to have been replaced by 

 legs in Prionus, 148 



Embryology, as a method of investigating 

 problems of Descent, 7 



Emperor moth, ocelli absent, 289, 301; 

 colour- variations of larva, 306 



Emu fowls, 55 



Enchytraeidse, generative openings, 165 



Encrinus, variation in number of radial 

 joints, 421 ; 4-rayed calyces, 436 ; 

 radius bearing only one arm, 438 



Enema pan, extra legs, 512 



Entoniscians, alter segmentation of 

 some crabs but not of all, 95 



Enhydris, incisors, 211 



Epiglottis, division of, 451 



Epipodites, variation of in Hippohjte, 

 151 



Epistome (of Beetle), division of, 454 



Erebia blandina, ocelli, 289 



Erinaceus, variation in hallux, 397 



Eriphia apinij'rons, extra chela?, 528 



Eros minutux, extra legs, 487 



Eso.r hichts, bulldog-headed, 58 



Esquimaux Dog, absence of first pre- 

 molars, 214, 215, 221 



Euchloe, pigments of, 72 



Eugeniacrinu.1, 4-rayed specimens, 436 



Euprepia purpurea, extra palpi (alleged), 

 524 



Eurycephalitis m<i.rillosus, extra legs, 487 



Euscorpius, double tail, 565 



Eye of Palinurus developed as antenna, 

 150 



Eye colour of Man, 43 



Eye-spots, 288 ; Variation as a whole, 

 291 ; outer zones first to appear, 291 ; 

 analogy with chemical phenomena, 



