INDEX OF SUBJECTS. 



591 



Symmetry, Secondary, preliminary ac- 

 count, 475; principles, 

 479 

 Scheme of relations of 

 parts in, 481; parts 

 repeated in, geometri- 

 cally peripheral to 

 points of origin, 557; 

 relation to Primary, 

 556, 557 

 in Insects, 475; Crus- 

 tacea, 525 ; Verte- 

 brates, 553 ; Batra- 

 chia, 554; Triton, 555 

 Syndactylism, Man, 355, 356; Pithecia, 

 356; Macacus, 356; Ox, 384—387; 

 Pig, 387—390 



Tadpole, extra Bpiracle in, 465 

 Tcenia coznurus, transposition of genera- 

 tive organs, 170 ; case of six 

 suckers and segments pris- 

 matic, 565 

 elliptica, asymmetrical arrange- 

 ment of genital pores, 170 



saginata, "intercalated 



seg- 



ments, 169; repetition of gene- 

 rative organs in proglottides, 

 169 ; two genital pores at the 

 same level, 170; consecutive 

 genital pores on same side, 

 170; bifurcation of chain, 566 

 solium, changes in position and 

 alternate arrangement of geni- 

 tal pores, 170 

 tenuicollis, bifurcation of chain, 

 566 

 Tail-fin, division of, in Gold-fish, 451 

 Tail-spine, division of, Limulus, 456; 



Scorpion, 457 

 Tapeworms, variations, 168 — 170; du- 

 plicity in, 565 

 Tarsus, in some beetles with only four 

 joints appearing, 25 ; variation in 

 number of joints, Blatta, 63, 415; 

 various numbers of joints in families 

 of Orthoptera, 415 

 Taurhina nireus, extra legs, 509 

 Taxidea, teeth, 233 

 Ta.vus baccata, colour-variation, 47 

 Teal, Garganey, division of digits, 392 

 Teeth, in undifferentiated series not 

 credited with individuality, 32 

 numerical Variation, 195 ; di- 

 vision of, 268 ; duplicate, 268 ; 

 statistics of Variation, 200, 

 209, 222, 235 

 relation of upper to lower, 196 

 of Primates, 199—208; Canidae, 

 209—222; Felidae, 223—226; 

 Viverridee, 227—231; Mus- 

 telidae, 231—235 : Pinnipedia, 

 235—243 ; Ungulata, 243— 

 246; Marsupialia, 246—258; 



Selachians, 259—262; 7.v 



a a in, 262 

 Teeth, terminal, least size of, 270; pn - 

 sence and absence of, 269; 

 Homteotic Variation in, 272 

 Recapitulation, 265 

 Telephorus, colour-variation, lividus, 43 

 division of pronotum, nigri- 

 cans, 455 

 double (?) antenna, lividus, 

 rotundicollis, 551 



double (?) leg, <.ff,ir,itii-. 



fuscus, 5 18 

 extra Legs, rusticus, 502 

 " Telescope " Gold-fish, 453 

 Tellina, sinistral variety. 54 

 Tenebrio granarius, double (?) leg, 548 

 Tentacles of Molluscs united, Helix 

 hispida, 461 ; Limazagn -• 

 tie, 460 

 repeated, Patella vulgata, 27$ 

 bifid, Phy8a acuta, 280 

 of Holothurians, 4.;~< 

 Tenthredo solitaria, extra legs, 502 

 ignobilis, extra leg, 546 

 Terias, colour-variation, 52, "»:5 ; am - 

 mone, hecabe, mandarina, mariesii, 52 ; 

 betheseba, constantia, jaegeri, 53 

 Terminal members of Series, variation 

 of, 79, 269, 271. 272. 407 

 teeth, 269, 272; digits, 107 

 Terrier, absence of premolar, 21"< 

 Testes, variation in number in Hirudo, 



165, 166 

 Tetraceros, horns not as in 4-horned 



Sheep, 285 

 Tetracrintu, normally 4-rayed, 5-r;r 



and 3 -rayed varieties, 137 

 Tetrops prceusta, double (?) It-}.'. ">1"> 

 Thoracopagous twins, transposition in. 



560 

 Thumb, variation in number of phalan- 

 ges, 324 

 double, 349 

 Thylacinus, teeth, 255 

 Thylacites pilosus, double (?) antenna, 



550 

 Thyonidium, variation in number of 01 



gans, 435 

 Tiaraps polydiademata, specific charad 



of, 426 

 Timarcha tenebricosa, extra anteni 



522 

 Tomato, colour-variation. 47 

 Tonicia, variation in colour of BOUfc 



308 

 Tongue, division ^i. L51 

 ToxotUS, extra « \. . 280 

 Transposition of viscera. 560 

 Triasters, symmetry of. ISO; found in 

 bilaterally symmetrica] areas "t" a 

 menting ovum, 164 

 Trichodet syriacus, double i?. 1 leg, 547 

 Trichosurus vulpecula, premolars, 254 



