INDEX 
Every reference is to the page: words in italics are names of genera or species ; figures 
in italics indicate that the reference relates to systematic position ; figures in thick 
type refer to an illustration ; f. = and in following page or pages ; n. = note. 
Abbott, 193 n. 
Abcona, 670 
Abdominal pores, 401 f. 
Abramis, 582 
Abyssascidia, 78 
Acanthaphritis, TO6 
Acanthias, 455, 298; vertebral column, 
198; uterine nutrition, 4384; <A. vul- 
garis, 264, 455 ; pectoral fin, 243 
Acanthicus, 595 
Acanthistius, 659 
Acanthocepola, 662 
Acanthoclinus, TO9 
Acanthocybium, 67. 
Acanthodei, 440 f., 148 
Acanthoderma, 724 
Acanthodes, 442; A. wardi, 441 
Acanthodidae, 447 
Acanthodopsis, 442 
Acanthonus, 712 
Acanthophthalmus, 582 
Acanthopleurus, 723 
Acanthopoma, 589 
Acanthopterygii, 650 f., 159, 306, 543 ; 
diagram showing relationships of groups, 
651 
Acanthuridae, 668, 357, 651, 652, 654 
Acanthurus, 668 ; A. chirurgus, 357 
Acara, 672 
Accessory respiratory organs, 292 
Acentronura, 634 
Acentrophorus, 498 
Aceratias, 719 
Acerina, 659 ; A. cernua, 659 
Acestra, 595 ; A. gladius, 595 
Acestrorhamphus, 573 
Acestrorhynchus, 575 
Achilognathus, 582 
Achiropsis, 687 
Achirus, 687 
Acipenser, 492, 149, 262, 264, 273, 274, 
276, 82, 348; ribs, 201; lymph 
follicles, 261 ; spiral valve, 268 ; gills, 
283, 284 ; air-bladder, 298, 299; vas- 
cular system, 319, 322, 328, 334; 
spleen, 343; gonoducts of female, 400, 
405 ; distribution, habits, and food, 493 ; 
breeding, 494; economic value, 494 ; 
A. huso, 494; A. rhynchaeus, pectoral 
fin, 243 ; A. ruthenus, 493 ; scales, 187, 
188 ; brain, 376; micropyles, 411 ; 
larva, 494; A. sturio, 493, 494; verte- 
bral column, 200; supra-renals, 346 ; 
micropyles, 411 
Acipenseridae, 486, 489, 495 
Acipenseroidei = Chondrostei, g.v. 
Acrania, 1/3 
Acrartete, 636 n. 
Acrochordonichthys, 588 
Acrodus, 445 
Acrogaster, GAG 
Acrognathus, G11 
Acropoma, G59 
Acropomatidae, 659, 654 
Acrotus, G44 
Actinistia, 477 n. 
Actinopterygii, 476 
Actinotrocha, 28 f., 29 
Acysis, 58S 
Adipose fins, 163 
Aegaeonichthys, 719 
Aelurichthys, 5SS 
Aethalion, 546 
Aetheolepis, 498 3 scales, 187 
Aetheospondyli, 497 
‘ 
Aétobatis, 465, 466 ; spines, 177 
Agassiz, 558 n., 685 n., 720 n. 
Ageniosus, 589 ; A. valenciennesi, 589 
Agnathostomata, 745 ; characters of, 147 
Agoniates, 575 
Agonidae, 700, 694 
Ayonopsis, 700 
