738 INDEX 
Dareste, 721 Dipterus, 506, 519; D. valenciennesi, 
Darters, 659 506 
Dascyllus, 672 
Dasyatis sabina, 464 
Dasyscopelus, 611 
Datnioides, 658 
Dawydoff, 16 n. 
Day, 569 n., 593 n. 
Deal-Fish, 715 S 
Delhez, 551 = 
Deltodus, 445 
Deltoptychius, 445 
Demersal, 408 
Dendrodoa, 76 
Dentex, G64 
Dentition, 247 f. ; dentinal tissues, 249 ; 
fixation of teeth, 249; succession and 
replacement, 250; shape, 251; sexual 
differences, 251; pharyngeal teeth, 251 ; 
Cyclostomata, 247; Petromyzon, 248 ; 
Fishes, 248 f.; Scylliwm, 249; Car- 
charias, 250 
Dercetidae, 623, 622 
Dercetis, 623 
Derepodichthys, 712 
Derichthys, GOL 
Dermal denticles, 183 f. ; structure and 
development, 183, 184, 185 
Diagramma, G64 
Dibranchus, 72 
Dicerobatis, 465 
Dicrotus, 679 
Didemnidae, 86, 82, 110 
Didemnum, S7 
Didymaspis, 530 
Dinichthys, 537, 149 
Dinolestes, G59 
Dinoperca, 659 
Diodon, 726, 163, 354, 361; scales, 191 ; 
teeth, 251; D. geometricus, 726; D. 
hystria, 364 
Diodontidae, 726, 722 
Diphycereal, 159 
Diplacanthidae, 447 
Diplacanthopoma, 712, 718 
Diplacanthus, 441 
Diplesium, 659 
Diplocrepis, 7O9 
Diplomystes, 588, 587 
Diplomystus, 563 
Diplophos, 571 
Diplophysa, 582 
Diplopterus, 477 
Diplosoma, 87 ; section, 87 
Diplosomatidae, 87, 110 
Diplosomoides lacazii, larva, 78 
Diplospondylic, 198 
Diplurus, 481, 161 
Dipneusti—see Dipnoi ; 
Dipnoi (Dipneusti), 505 f., 149 ; distribu- 
tion, 512 
Dipterodon, 665 
Diptychus, 582 
Disartete, 636 n. 
Discocephali, 697 f., 651, 652 
Discognathus, 582 
Discopyge, 464 
Distaplia, 85; D. magnilarva, larva, 78 
Distichodontinae, 576 
Distichodus, 576; D. niloticus, mouth, 
577 
Distoma, 85 
Distomatidae, 85, 81, 82, 83, 86, 110; 
reproductive organs, 56; ascidiozooid, 
82; transverse section, 86 
Ditrema, G70; D. temminckii, 670 ~ 
Dog- Fishes, 446 
Dolchinia, 96,100; D. mirabilis, 100 
Dolichoglossus, 17, 5, 13; D. kowalevskit, 
6, 7, 9, 20; D. otagoensis, 11 
Dolichorhynchus, 137 ; D. indicus, 137 
Doliolidae, 96, 39, 110 
Doliolum, 96, 37,3; structure, 96;  life- 
history, 97, 98 ; occurrence, 99 ; bud- 
ding, 973; polymorphism, 98; VD. 
nationalis, 99 ; D. tritonis, 96, 99 
Dollo, 518 
Dolopichthys, 719 
Dolphins, 681 
Doradinae, 58S 
Dorado, 578 
Doras, 588, 590, 592, 363; intestinal 
respiration, 292;  stridulation, 357 ; 
elastic-spring-apparatus, 359 ; D. imacu- 
latus, air-bladder, 303; nature of 
sounds, 362 
Dorsal lamina, 45, 47, 52, 101, 105 
Dorsal pore, 18, 19, 31 
Dorsal tubercle, 52, 79 
Doryichthys, 634, 635 
Doumea, 588 
Doydixodon, G64 
Draconetta, 706 
Dragonet, 707 
Drasche, 38 
Drepanaspidae, 525, 530 
Drepanaspis gemiindenensis, 526, 
525, 526 
Drepane, 668 
Drepanidae, 668, 654 
Drum, 663, 304, 362 
Ductor, 677 
Dufosse, 355 
Dussumieria, 563, 563 
Dybowski, 697 un. 
Dysichthys, 596 
Dysomma, 603 
Dysommatopsis, 603 
530, 
Eagle Rays, 465 
Echeneididae, 697 
| Echeneis, 691 ; cephalic sucker, 161 
