INDEX OF SUBJECTS. 



577 



Artiodactyla, polydactylism, 373; syn- 

 dactylism, 383 *; teeth, 245, 24G 

 Ascidia plebeia, specimens having every 

 fourth vessel of branchial sac dilated, 

 172 

 Ascidians, variation in branchial struct- 

 ures, 171, 172; extra atriopore, 456 

 Ass, canines, 245 ; molars, 246 ; absence 



of digital variation in, 360 

 Astaeus fluviatilis, colour-variation, 44 

 variation in number 

 of oviducal open- 

 ings, 84, 152 

 absence of male open- 

 ing, 154 

 absence of oviducal 



opening, 152, 153 

 absence of opening 

 from green gland, 

 154 

 extra chela?, 529, 537 

 extra processes from 

 chela?, 536 

 ■ repetition of exopod- 

 ite of antenna, 538 

 A. leptodactylus, extra dactylopodites, 



532 

 A. pilimanus and braziliensis, apparent 

 presence of female opening in males, 

 155 

 Asterias, variation of pedicellaria?, 429; 

 arms, 439 

 with 8 rays and 3 madreporites, 



440 ; extra water-pore, 466 

 polaris, normally 6-rayed, 433 

 problema, tenuispina, undergo 

 fission, 433 

 Asterina, 4-rayed and 6-rayed specimens, 



440 

 Asteroidea, arms, 439-441 

 Ateles, teeth, 205, 206, 207 

 Atriopore, extra, in Ascidians, 456 

 Attelabus, division of pronotum, 455 

 Aulas to ma gulo, asymmetrical variation 



in generative organs, 167 

 Aurelia aurita, Meristic Variation of, 



426; statistics as to, 428 

 Auricles, cervical, in Man, 177 ; in Pig, 

 179; in Sheep and Goats, 180; are 

 repetitions of ears, 180 



Baer, von, Law of, 8; its proper scope, 

 9; probably not applicable to cases 

 of Discontinuous Meristic Variation, 

 571 



Balance between mamma 3 , 189 ; between 

 teeth, 213 



Balanacrinus, 4-rayed specimens, 436 



Bulanoglossus, two methods of develop- 

 ment, 9 ; number of gill-slits, 174 ; 

 extra proboscis-pore, 466 ; supposed 

 relation to Chordata, 86 



Batrachia, extra limbs, 554; spinal 

 nerves, 141; vertebra?, 124; extra 



B. 



atrial opening, 465; axial duplicitv, 

 561 

 Bdellostoma, individual and specific 

 variations in number of 

 gill-sacs, 173, 174 

 cirrhatum, kept at renin, 

 heterotrema, hexatrema . 

 173; bischotfh,polytrema, 

 174 

 Beech, fern-leaved, 25 

 Bees, hermaphrodite, 68 ; union of 

 eyes, 461 ; antenna modified as foot, 

 147 

 Beetles, variation of horns, 38; an- 

 tenna, 411, 413 ; extra ap- 

 pendages in Secondary Sym- 

 metry, 475 ; legs, 483 ; "an- 

 tenna?, 513; palpi, 524; di- 

 vision of pronotum, 455 

 supposed double legs, 544 ; sup- 

 posed double antenna?, 54s ; 

 supposed double palpi, 551 

 Bembidium striatum, extra palpi, 524 

 Bettongia, variation in molars, 258 ; 



cunieulus, lesueri, penicillata, 258 

 Bilateral asymmetry, Homceosis in cases 



of, 465 

 Bilateral Series, nature of, 88; Meristic 



Variation of, 448 

 Bilateral Symmetry, 19 ; in variation of 

 vertebra, 128; in variation 

 of Annelids, 167 ; in varia- 

 tion of mamma?, 183; in 

 variation of teeth, 267; in 

 cervical fistula?, 175; in 

 variation of ocelli, 292; in 

 variation of digits, 402; in 

 variation in antenna? of For- 

 ficula, 414; in variation of 

 Eadial Series, 427 ; in ab- 

 normal branching of Ante- 

 don, 438; in distribution of 

 triasters in segmenting egg, 

 464 ; in abnormal union of 

 blastomeres, 464 

 as found in manus and pes, 



369, 403 

 influence on Secondary Sym- 

 metries doubtful, 557 

 Bipinnaria, extra water-pore, 466 

 Birds, spinal nerves, 129 ; digital Varia- 

 tion, 390, 396 

 Blaniulus, mode of increase in number 



of segments, 93 

 Blaps, extra legs, 512; extra antennae, 

 attenuata, 522; double antenna, chev- 

 rolati, cylindrica, similis, 551 

 Blatta, variation in number of tarsal 

 joints, discussion of, 63 ; facts, 415 ; 

 regeneration of tarsus with 4 joints, 

 416 

 Blue, as variation of red, 44 

 Boar, Wild, extra digits, 383 

 Bombinator, vertebra?, 127 



37 



