INDEX OF SUBJECTS. 



577 



Artioclactyla, polydactylism, 373; syn- 



dactylism, 383 ; teeth, 245, 246 

 Ascidin plebcia, specimens having every 

 fourth vessel of branchial sac dilated, 

 172 



Aseidians, variation in branchial struct- 

 ures, 171, 172 ; extra atriopore, 456 

 Ass, canines, 245; molars, 246; absence 



of digital variation in, 360 

 Astaeusftuviatilis, 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 



.4. leptodactylus, extra dactylopodites, 



532 



A. piliiiKiinis and braziliensis, apparent 

 presence of female opening in males, 

 155 

 AaterUm, variation of pedicellarite, 429; 



arms, 439 

 with 8 rays and 3 madreporites, 



440 ; extra water-pore, 466 

 polaris, normally 6-rayed, 433 

 probleiii/i, tenuixpina, undergo 



fission, 433 

 Asterina, 4-rayed and 6-rayed specimens, 



440 



Asteroidea, arms, 439-441 

 Ateles, teeth, 205, 206, 207 

 Atriopore, extra, in Aseidians, 456 

 Atteltibus, division of prouotum, 455 

 Aulantonut (julo, asymmetrical variation 



in generative organs, 167 

 Aurelia aiirit/i, 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 



Jiiilnnocrinus, 4-rayed specimens, 436 



Balanofllossus, 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; vertebrae, 124; extra 



B. 



atrial opening, 465; axial duplicitv, 

 561 



Bdellostoma, individual and specific 

 variations in number of 

 gill sacs, 173, 174 

 cirrhatum, heptatrema, 

 hetcrotrema, hexatrema , 

 173; bischoffi,polytr>ema, 

 174 



Beech, fern-leaved, 25 

 Bees, hermaphrodite, 68 ; union of 

 eyes, 461 ; antenna modified as foot, 

 147 



Beetles, variation of horns, 38 ; an- 

 tennas, 411, 413; extra ap- 

 pendages in Secondary Sym- 

 metry, 475 ; legs, 483 ; an- 

 tennae, 513; palpi, 524; di- 

 vision of pronotum, 455 

 supposed double legs, 544 ; sup- 

 posed double antennas, 548 ; 

 supposed double palpi, 551 

 Beinbidiitm striatum, extra palpi, 524 

 Bettonrjiu, variation in molars, 258; 



cuniculus, 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 

 vertebrae, 128; in variation 

 of Annelids, 167 ; in varia- 

 tion of niamnia?, 183; in 

 variation of teeth, 267 ; in 

 cervical fistulas, 175; in 

 variation of ocelli, 292 ; in 

 variation of digits, 402; in 

 variation in antenna? of For- 

 jicula, 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, 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 antenna?, 

 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 



