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 spiracle in, 465 

 Tcenia ccenurus, 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; rejjetition 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 nirens, extra legs, 509 

 Tax idea, teeth, 233 

 Taxus 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 ; Canida?, 

 209—222; Felidaa, 223—226; 

 Viverridae, 227—231; Mus- 

 telidffi, 231 — 235 : Pinnipedia, 

 235—243 ; Ungulate, 243— 

 246 ; Marsupialia, 246 — 258 ; 



Selachians, 259—262; Bucci- 

 num, 262 

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

 sence and absence of, 269; 

 Homceotic Variation in, 272 

 Recapitulation, 265 

 Telephones, colour-variation, lividus, 43 

 division of pronotum, nigri- 

 cans, 455 

 double (?) antenna, lividus, 



rotuiulicollis, 551 

 double (?) leg, exeavatus, 



fuscus, 548 

 extra legs, rusticus, 502 

 " Telescope " Gold-fish, 453 

 Tellina, sinistral variety, 54 

 Tenebrio granarius, double (?) leg, 548 

 Tentacles of Molluscs united, Helix 

 hispida, 461; Limaxagres- 

 tis, 460 

 repeated, Patella vulgata, 279 

 bifid, Physa acuta, 280 

 of Holothurians, 435 

 Tenthredo solitaria, extra legs, 502 

 ignobilis, extra leg, 546 

 Terias, colour-variation, 52, 53 ; ane- 

 mone, heca.be, mandarina, mariesii, 52 ; 

 betheseba, constantia, jaegeri, 53 

 Terminal members of Series, variation 

 of, 79, 269, 271, 272, 407 

 teeth, 269, 272 ; digits, 407 

 Terrier, absence of premolar, 215 

 Testes, variation in number in Hirudo, 



165, 166 

 Tetraceros, horns not as in 4-horned 



Sheep, 285 

 Tetracrinus, normally 4-rayed, 5 -rayed 



and 3-rayed varieties, 437 

 Tetrops prausta, double (?) leg, 545 

 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 or- 

 gans, 435 

 Tiar ops poly diademata, specific character 



of, 426 

 Timarcha tenebricosa, extra antennae, 



522 

 Tomato, colour-variation, 47 

 Tonicia, variation in colour of scutes, 



308 

 Tongue, division of, 451 

 Toxotus, extra eye, 280 

 Transposition of viscera, 560 

 Triasters, symmetry of, 430; found in 

 bilaterally symmetrical areas of seg- 

 menting ovum, 464 

 Trichodes syriacus, double (?) leg, 547 

 Trichosurus vulpecula, premolars, 254 



