INDEX OF SUBJECTS. 



589 



Piijfinug, brachial plexus, 130 



Pug, breeds of, 57; teetb, 221 



Purpura lapillKa, colour-variation, 48 



Putoriiia, teeth, 231, 234 



Py;i<rra anastomosis, extra wing, 284 



Pygidium, division of, iuMelolontha, 456 



Pygomelian geese, 401 



Pyrameis cardui, aberrations of, 49, 52; 



var. kershaivi, 49, 52; var. eli/mi, 50, -51 

 Pyrodea speciosit*, extra legs, 496 

 Pi/thon, imperfect division of vertebrae, 



103, 105 



Kadial joints of Crinoids, 421 

 Kadial Series, Meristic Variation in, 60; 

 evidence, 422; in Echinodermata, 432 

 Radii, variations in number, Holo- 

 thurioidea, 433 ; Crinoidea, 435 ; As- 

 teroidea, 439; Echiuoidea, 441 ; Ophi- 

 uroidea, 433, 447 

 Eadius, absence of, 360 

 Radulas of Bucciniim, 262 

 Raiidae, eye-spots, 302; extra fin, 540; 

 division of tin into lobes, 540; separa- 

 tion of fin from head, 540 

 Rana, vertebra;, 124, 126; double foot, 

 540; spinal nerves, 142; extra lirnbs, 554 

 Eanzania bertolonii, extra legs, 510 

 Raspberry, yellow variety, 47 

 Eed, variations of, 44 48; as variation 



from blue, 44 

 Eenal arteries, 277 

 Repetition of Parts, association of these 



phenomena, 21 

 Repetition, Linear, Bilateral or Eadial, 



distinctions between, 88 

 Units of, 556 



Eeptilia, vertebrae, 103, 123 

 Reversion, hypothesis made in order to 

 escape recognition of Discontinuity in 

 Variation, 76 



Rhafiium inorda.r, double (?) leg, 548 

 Rliea, brachial plexus, 130 

 Rhinopter.a, teeth, 259 261, javanica, 



261, jussieui, 259 

 Phizocrinus, 6-rayed specimen, 437 

 Rhizotrogus, extra legs, (csticalis, 510; 



ca-staiit'us, 512 

 extra antenna?, cequinoc- 



ti/ilis, 517 

 division of metasternal 



plates, 456 



Rhombus, pigmentation of blind side, 

 467471; leevis, 467, 468, 

 470; iiia.rimiis, 467, 470 

 variations in scales, 468 

 Rhynchitex fjermauicus, double (?) an- 

 tenna, 550 

 Rhyttirhinus, supposed case of extra 



eye, 281 

 Ribs, division of, in Man, 105 



cervical, in Man, 108, 112, 115; in 

 Dog, 122; Bradypodidae, 119; on 

 6th vertebra in Man, 108 



Eibs, variations in dorso-lumbar region, 

 Man, 109 116; Anthropoid Apes, 

 116118; Bradypodidai, 121; 

 Fell*, 122; Canix, 122; Gulictin, 

 123: Halich&rus, 123 ; eleven in 

 Siamese Twins, 5IJO 



Rissa, variations of hallux in the genus, 

 396, 397 



Roebuck, horns, 286 ; polydactylism, 

 374, 379 ; union of horns, 460 



Rubitx idteus, colour-variation, 47 



Rupictipra trui/iix, horns. 28(5 



liutela fasciuta, extra legs, 512 



Sacculinu, effect of, on segmentation of 



Carcinus and other Crabs, 95 

 St Bernard dog, duplicity of hallux in, 



401 

 Salinity, doubtful relation of variations 



of Crustacea to changes in, 100 

 Salmo fario, salar, truttn, 58 

 Salmon, bulldog-headed variety , 58 ; axial 



duplicity, 563 



Salnuiciiui, double tail, 564 

 Salt lakes, Crustacea of, 96, 100 

 Samia cecropia, extra wing, 283 

 Sand-canals, repetition of, in Asterias, 



440 

 Saperda carcharias, extra antenna arising 



from head, 551 

 Sarcophilus, teeth, 255 

 Sarsia, Meristic Variation in, 424 ; with 

 six segments, 424 ; with five segments, 

 425 



Saturnia carpiiii, repetition of eye-spots 

 in wings, 26; extra wing, 282; varia- 

 tion of eye-spots, 289, 301, 302 ; 

 colours of larvae, 306 

 Satyrus hyperanthus, eye-spots, 294 

 Sawfly, extra legs, 502, 546 

 Scales of Pilchard, 274 ; of Gasterosteus, 



276; of Snakes, 276 

 Scarites pyracmon, extra legs, 500 

 Scheme, shewing the relations of parts in 



Secondary Symmetry, 481 

 Scolopendra, number of segments, 94 

 Scorpion, double poison-spine, 457 ; 



double tail, 565 



Scraptia fusca, extra antenna?, 523 

 Seals, variations in dentition, 235 

 Segmentation, metameric, not in kind 

 distinct from other forms 

 of Repetition, 28 ; two 

 ways by which a full seg- 

 mentation may have been 

 achieved in phylogenv, 

 86 



of Arthropoda, variation 

 in, 91 ; imperfect in An- 

 nelids, 156 ; spiral in 

 Annelids, 157 ; variation 

 of in Cestoda, 168, 170 

 of mamma, 191 

 of ovum, variations in, 463 



