748 



INDEX 



Xeolebms, 570 



-XcopcnipheHs, 657 



A^copercis^ 705 



Xcoscopelus, 611 



Neosilu-rus^ 5SS 



Nepliridia, of Amphioxus, 125 



Nephrostomes, 398 ; j^ersisteut, 401 



Neplirotome, 397, 398 



Xcrophis, 634, 635 



Nerve eminences, 383 



Xervous system, of Chordata, 4 ; of Heuii- 

 chordata, 9, 25, 30 ; of Tunicata, 53, 

 58, 66 ; of Amphiaxus, 127 f., 13> ; of 

 Fishes, 367 f. 



Xcsiarchus, 679 



Nesting habits of Sticlflebacks, 630 



Nests of Fishes, 414 f., 427, 500, 501, 614, 

 515, 517 ; of Arius, 593 ; of Doras and 

 (Jallichthys, 592 ; of GoUus, 690 ; of 

 Gymnarchus, 552 ; of Heterotis^ 558 ; of 

 Spmachia, 631 



Nettastoma, 601 



Settenchelys, 601 



NettopihicMhys, 601 



Neural gland, 52 



Neurenteric canal, 57, 131, 133 



Neuronieres, 195 n. 



Nenropore, 10, 58, 59 



Nilhechte, 550 



Nilsson, 715 



AHphon, 659 



Nishikawa, 685 n. 



Noll, 584 n. 



Nomeus, 6JfS ; iV. gronmii, 643 



Norman, 23 



Notacanthidae, OBJ/. 



Nntacanthtis, 625 ; X. bonapartii, 625 



Xotagogus, ^98 



Notidanidae, 44^, 279 ; persistent neiol]ro- 

 stomes, 401 



XdtiiJnnus, 44s, 345; spiral valve, 267; 

 ^V. rinrn'i's, branchial clefts, 277 ; 

 skull, 222 ; X. griseus, branchial clefts, 

 277 



Notochord, 3 ; of Enteropneusta, 14 ; of 

 Cephalodiscus^ 24, 25 ; of Rhahdopleurc, 

 27 ; of Actinotrocha, 28 ; of Tunicata, 

 57, 60, 61; of Amphioxus, 119, 118, 

 119, 132 ; of Fishes, 193 f 



XnhyhiiiUliirin, 5SS 



Xutoglanis, 588 



Xotogoneus, 572 



Notopteridae, 554, 644, 303, 389, 405 



Xotopterus, 555, 153, 305, 306 ; N. afei; 



skeleton, 554 ; X. chitala, 555 

 Xutothenia, 706 

 Nototheniidae, 706, 704 

 Xntnrus, 588, 590 

 Xnvacula^ 67S 



Nucleus, of Thaliacea, 101, 105 

 Xic-ia, 5S2 

 Nuryc, 97 



Oar-Fish, 716, 163 



Oblata, 664 



Ocelli, 53 



Octacnemidae, lOS, 101 



Oclacnemus, 109, 101 ; O. hythius, 109 ; 



0. patagoniensis, 109 

 Odax, 674 

 Odaxothrissa, 563 

 Odontaspis, 451 

 Odonteus, 67S 

 Odontonectes, 660 

 Odontostomus, 611, 613 

 Oenoscopus, 545 

 Oesophageo-cutaneous duct, 281 

 Oikoplasts, 66 

 Oikopleura, 68, 67, 69 ; transverse section, 



67 ; longitudinal section, 68 ; O. ccpho- 



cerca, 66 ; 0. dioica, 70 ; 0. fahdlum, 



transverse section, 69 

 Olfactory organs, 165, 390 f., 391, 392 

 Olfactory pit, 129 

 Oligopleuridae, 545, 544 

 Oligoplejt'nis, 545 

 Oligorus, 659 

 Oligosarcus, 575 

 Oligntrema, 78, 111 u. 

 Olt, 584 n. 

 Olyra, 588 



Omble Chevalier, 567 

 Oriiiodon, 611 

 Oiiiosiidis, 611 

 Onccyrhynchus, 566 

 Oneirodes, 710 ; 0. eschrichtii, 174 

 Onii.'!, 64s ; coloration of larvae, 175 

 Oozooid, 84, 91, 93 

 Opah, 628, 164 



Operculum, 25, 155, 278, 282, 283 

 Ophickthys, 601 

 Ophidiidae, 713, 651, 702, 704, 163, 



361 

 Ophidium, 713, 361 ; air-bladder, 302 

 Ophiohlennius, 709 

 Ophiocephalidae, 644, 637, 163, 293, 361 ; 



distribution, 645 

 Ophi<ii-eph(diis, 645 ; labyrinthiform organ, 



293 ; 0. maruHus, 361 ; 0. gacJiua, 



361 

 Ophiodon, 696 ; 0. elongatus, skull, 692 

 Opisthoccntrus, 709 

 Opisthognathns, 661 

 Opisthomi, 716 f., 651, 306 

 Opisthomyi-.on, 691 

 Opisthonema, 563 

 Opisthoproctus soleatus, telescopic eyes, 



395 

 Opisthopteryx, 611 

 Opostomias, 571 ; 0. iiikrip)ius, photo- 



phores, 178, 179, 181 

 Opsanus, 711 

 Oljsarlichtln/s, 582 

 Oral hood, 116, 119, 136 

 Oreinus, 582 



