Monascidiae, 35 
Monocentridae, 656, 653 
Monocentris, 656 
Monocirrus, GSS 
Monogamy, 413 
Monopterus, 597; M. javanensis, head, 
skull, pectoral arch, vertebrae, 598 
Moon-eyes, 553 
Moon-fish, 579 
Morchelliun, 
88 
Mordacia, 426 
Morgan, 11 n., 20, 21 n., 31 n., 32 
Moringua, GOL 
Mormyridae, 549, 544, 164; larval gills, 
290 ; abdominal pores, 401 
Mormyrinae, 557 
Mormyrops, 551, 549 
Mormyrs, 551 
Mormyrus, 51; M. caballus, 649; electric 
organs, 365, 366, 401 
Morone, 659, 660 
Moseley, 95, 613, 702 n. 
Motella, 649, 288 
Mouth, position, size, and shape ; of Cyclo- 
stomata, 150; of Fishes, 153 f. 
Mozxostoma, 581 
Mud-Fish, 610 
Mugil, 640, 264; M. capito, 640 
Mugilidae, 640, 637, 256 ; gizzard, 260 
Miiller, H., 37 
Miiller, J., 19, 31, 112, 129 
Miiller, O. F., 36 
Miillerian duct, 398, 400, 404 
Mullets, Grey, 640; Red, 665 
Mullidae, 665, 654 
Mulloides, 665 
Mullus, 665 ; M. barbatus, 666; M. swr- 
mutletus, 666 ; pectoral arch, 666 
Muraena, 605 ; M,. helena, 600, 605 
Muraenesox, GO1 
Muraenichthys, GOL 
Muraenidae, G04, 163, 259 
Muraenolepididae, 649 
Muraenolepis, G49 
Murray, 613 
Muscular system, 350 
Mustelus, 448, 298; placenta, 434, 449 ; 
M. antarcticus, radialia of the dorsal fin, 
234; vascular system, 316, 317, 330, 
331, 334; placenta, 435; IM. Jaevis, 
449 ; M. vulgaris, 449 
Myletes, 576 
Myleus, 576 
Myliobatidae, 465 ; teeth, 251 
Myliobatis, 465, 466; M. aquila, 465, 
466 
Miylostoma, 537 
Myocoele, 397, 398 
Myocomma, 117 
Myomyrus, 551 
Myotome, 117, 133 
. 
8&8; M. argus, stomach, 
Myriacanthidae, {68 
Myriacanthus, 468 ; M. granulatus, 468 
Myripristis, 656 
Myroconger, GOS 
Myrophis, GO1 
Myrus, GOL 
Myxine, 422, 147; external characters, 
151; thread-cells, 182; vertebral 
column, 197; teeth, 248; liver, 273; 
pancreas, 273; gill-sacs, 281 : blood 
corpuscles, 341; brain, 372; auditory 
organ, 387, 388; pituitary involution, 
391; degenerate eyes, 394, 395; pro- 
nephros, 399, 400; genital pore, 403 ; 
distribution, 422; habits, 422; lher- 
maphroditism, 423; MM. g/utinosa, 151, 
422, 423 
Myxinidae, 422 
Myxinoides, 427 f. 
Myzus, 640 
Nandidae, 648, 653 
Nandus, 658 
Nannaethiops, 576 
Nannobrachium, 611 
Nannocampus, 634, 635 
Nannocharax, 576 
Nanoglanis, 588 
Nanognathus, 576 
Nanostomus, 676 
Nansenia, 506, 565 
Narcetes, 570 
Narcine, 464 
Naseus, 668 
Naucrates, 677 ; N. ductor, 677 
Nealotus, 679 
Neatherina, 639 
Nebris, 663 
Nedystoma, 588 
Needle-Fish, 634 
Nemachilus, 582 
Nematabramis, 582 
Nematistius, 677 
Nematogenys, 588, 587 
Nematonotus, 611 
Nemichthyidae, 603 
Nemichthys, G05 
Nemopteryx, 648 
Neobola, 582 
Neoborus, 576 
Neobythitis, 712 
Neoceratodus, 508, 259, 291; skull, 231 ; 
pectoral fin, 244 ; gills, 285, 286 ; lung, 
291, 299, 300; vascular system, 523, 
324, 329, 338; grunting sounds, 363 ; 
brain, 377; abdominal pores, 401 ; 
Miillerian ducts in the male, 407 ; dis- 
tribution and habits, 508, 512; spawn- 
ing, 510; eggs, 510; young, 510, a 
relations with other Dipnoi, 518, 519; 
N. forsteri, 508, 509 
Neochanna, GUS 
