INDEX OF SUBJECTS. 



577 



Artiodactyla, polydactylism, 373; syn- 

 dactylism, 383 ; teeth, 245, 246 

 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 fluvidtilis, 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 

 Aster ias, variation of pedicellariae, 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-raved and 6-rayed specimens, 



440 

 Asteroidea, arms, 439-441 

 Ateles, teeth, 205, 206, 207 

 Atriopore, extra, in Ascidians, 456 

 Attelabus, division of pronotum, 455 

 Aulastoma 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?, 189 ; between 

 teeth, 213 



Balanocrinus, 4-rayed specimens, 436 



Balanoglossus, 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 

 Bdell08tQma t individual and specific 

 variations in number of 

 gill-sacs, 173, 174 

 cirrhatum, heptatrema, 

 heterotrema, hexatrema, 

 173; btichoffi,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 leg.-,, 544 ; sup- 

 posed double antennas, 51s ; 

 supposed double palpi, 551 

 Benibidium striatum, extra palpi, 524 

 Bettontjia, variation in molars, 258; 



cuniculus, lesueri, penicillata, 258 

 Bilateral asymmetry, Homceosis in cases 



of, 465 

 Bilateral Series, nature of. 88; Bieristic 



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 antennae <>f /•'<</•- 

 fieula, 414; in variation of 

 Radial Series, 427; in ab- 

 normal branching of Ante- 

 don, 438; in distribution of 

 triasters in segmenting egg, 

 464 ; in abnormal union of 

 blastomeres, 164 

 as found in manna and p< -. 



369, 403 

 influence on Secondary Sym- 

 metries doubtful, 5 7 

 Bipinnaria, extra water-pore, (66 

 Birds, spinal nerves, 129; digital Varia- 

 tion, 390, 396 

 Blaniulus, mod.' of increase in uum 



of segments, 93 

 Blaps, extra legs, 512; extra antennae, 

 attenuate, 522; double antenna, ehev- 

 rolati } cylindrica, similis, •">•"> 1 

 Blatta, variation in number ><( tarsal 

 joints, discussion of, 63; facts, 1 1 5 : 

 regeneration of tarsus with 4 joint-. 



116 



Blue, as variation of i. .1. 1 1 

 Boar, Wild, extra digits, 38 

 Bombinator, vertebra . 127 



37 



