REPORT ON THE AMPHIFODA. 



1735 



Mosaic vision, in which as in mosaic work the view of an 

 object is obtained by the combination of many small 

 pieces, this according to Johannes Miiller being the mode 

 of sight resulting from the structure of the compound 

 eyes of the Arthropoda, 139, 483, 490, 495, 1635. 



Muscles, 489, 503, 1636, 1647. 



Muticus (ante-classical form of mutilus, curtailed, docked), 

 a word used by the early writers apparently not in 

 accordance with its meaning ; Latreille, Hist. Nat. , t. iv. 

 p, 13 (An. X), thus describes the "pattes mutiques" in 

 the Millepieds, "Leurs pattes sont composees d'articles 

 diminuant insensiblement de grandeur, ce qui leur donne 

 une forme conique; l'article qui les termine est d'une 

 matiere plus dure, cornee ou ecailleuse, va en pointe plus 

 on moins arquee, et sert de crochet ; niais on observe ici 

 que ce crochet, par la diminution graduelle des articles 

 de la patte, en est une suite, et que ce n'est pas un corps 

 surajoute brusquement, de meme que les petits ongles 

 des tarses des autres insectes. On remarque une 

 semblable configuration dans les tetraceres et les 

 crustaces, dont les pattes ne sont pas en nageoires.'' 23, 

 26, 29, 44, 51, 96, 126. 



Myeloid substance (/uueXds, marrow), 4S9, 567. 



Myogene (fivs, muscle), muscle-producing, 1647. 



Nackendriise, 504. 



Nackenorgan, 477. 



Natatorii pedes, appendices natatorii, natatory feet, i piedi 

 natatori, 102, 116, 150, 154, 198, 286. See Pleopods. 



Nektopoden (ptjkto j, swimming, novs, foot), 1654. See Pleopods. 



Nervous system, 132, 153, 154, 304, 364, 504, 567, 597. See 

 Brain, Commissure, Ganglion. 



Neusteri (vevffrijp, a swimmer), 37. See Pleopods and Uropods. 



Nidifica, nest-makers, 290, 307. 



Normalia, 290, 360. 



Nuclei of Semper, 490, 495, 597. 



(Esophagus {oi<ro(pdyos, the swallow or gullet), 154, 304, 321, 

 489. 



Olfactory, cylinders, filaments, organs, setse, organa cyliudri- 

 formia, papilles olfactoires, Kiechhaare, Riechzapfeu, 

 Spiirfaden, 154, 304, 324, 349, 448, 457, 481, 510, 515, 

 548, 552, 597, 1648. 



Olfactory denticle or tubercle (so-called), 290, 372,'481. 



Oostegites (£>6v, an egg, (rreya, I protect), 553. See Incubatory 

 pouch. 



Ostia, ostioles, of the heart, 489, 549. See Heart. 



Otoliths (ois, Ws, an ear, \l8os, a stone), 405, 473, 553, 597. 



Ovaries, 320, 471, 490. 



Palma. ' ' By palma (palm of the hand) we mean the part of 

 the margin of the hand against which the finger closes " 

 (Dana, U.S. Explor. Exped., vol. xiii. p. 855). Some- 

 times, however, the palm is defined by some process of 

 the hand, which the finger either passes beyond or does 

 not reach; Costa uses the expression "the unguicular 

 palm." 



Palpi, a term used by Scopoli for the upper antennae, 24, 25 ; 

 applied by Fabricius to various parts of the mouth- 

 organs, 43, Olivier using the word antennules as an 

 equivalent, 57 ; by Milne-Edwards the name palp was 

 given to that part of the limb which he afterwards called 

 the exopodite, 153, 154 ; in writings on the Amphipoda 



the term is usually and exclusively applied to what is 

 presumably the endopodite of the mandibles, first 

 maxilla;, and maxillipeds ; Bate and Westwood, vol. i. 

 p. xiv, observe "The mandibles are no exception to 

 the fact that all appendages are but modified legs. In 

 all Crustacea, we think that it can readily be demon- 

 strated that the mandible consists of the first three joints 

 being closely anchylosed. The small appendage, that 

 generally consists of three freely articulated joints, 

 represents the fourth, fifth, and sixth joints ; the 

 seventh, or dactylos, being seldom present. An 

 homological examination of the genera Nclalia and 

 Pontia, with JJomarus, together with the homotypical 

 parts in other appendages in the same animals, we think 

 will readily confirm this opinion ; " Milne-Edwards had 

 earlier taken the same view, 154 ; Huxley, The Crayfish, 

 p. 171, says of the mandible, "The endopodite is repre- 

 sented by the three-jointed palp;" Claus, Die Platy- 

 sceliden, p. 9, appears to take a different view, for 

 he says, "Spence Bate und Westwood betrachten 

 merkwiirdigweise den Kautheil der Mandibel bei den 

 Amphipoden als aus drei verschmolzenen Gliedern 

 hervorgegangen und fiihren den Taster auf das 4., 

 5. und 6. Glied der Extremitat zuriick, deren Dactylus 

 selten erhalten sei. Es bedarf wohl keiner weiteren 

 Ausfuhrung, dass diese Ansicht eine willkurliche ist 

 und durch keine Thatsache gestiitzt wird." 



Paragnathen, Paragnatha, Paragnathi {irapa, beside, yvidos, 

 a jaw), 477, 488, 553. See Labium. 



Parasites, 149, 317, 427, 490, 566, 579, 714, 1137, 1630. 



Parasitic Amphipoda, 137, 392, 436, 464, 579, 1630. 



Pata-quijadas, maxillipeds, 231. 



Pedestria, 24. 



Pedipalpi. See Maxillipeds. 



Peduncle, in the Amphipoda applied to the basal portion of the 

 antenna;, pleopods, and uropods. 



Peraon, pereion ("from ireptuoa, to walk about, pereion, part 

 which supports the walking legs," Spence Bate, Brit. 

 Assoc. Report, 1855, p. 27), normally consisting of seven 

 segments to which the two pairs of gnathopods and five 

 pairs of peraopods are attached ; the equivalents are — 

 body, thorax, truncus {thorax and abdomen), Mittelleib. 

 Rumpf, Brust. 



Perrcopoda, pereiopoda, pedes ambulatorii, the five pairs of 

 appendages that follow the gnathopods. The term is 

 occasionally extended to include the gnathopods, and 

 is then equivalent to — pattes thoraciques, Brustfiisse, 

 Thoracalbeine, Fusspaaren. 



Pericardium (irepi, round, KapSia, the heart), 516, 526. 



Pericerebral ring, 526. 



Perio;sophageal collar, 526. 



Perirenal riug, 526. 



Permian, the geological system between the Carboniferous and 

 the Triassic, 300. 



Phosphorescentia, 75, 76, 87, 108, 123, 194, 275, 327. 



Phylogenie, 537. See Genealogy. 



Phytibranchia {<pwr6v, a plant, $piyxia, breathing-organs), 99, 

 125, 138. 



Piedi mascellari, pedes maxillares, palpi maxillares, applied 

 erroneously to the lower antenna;, 145, 152, 239, 346, 347. 



