REPORT ON THE AMPIIIPODA. 



1733 



The three first abdominal segments have each a ganglion. 

 Close upon the last follows the little last ganglion corre- 

 sponding to three reduced and coalesced ganglia. The 

 ,liou having a constituent from each side of the body 

 is sometimes spoken of as the ganglion-pair or double- 

 ganglion. 132, 219, 260, 304, 364, 43S, 471, 489,567, 597, 

 1646. 



Garnell, 6, 7. 



Gasteruri {ya<m\p, abdomen, ovpd, tail), 83, 85. 



Gattung, 120. 



Genealogy, 134, 406, 423, 455, 479, 4S2, 526, 537. 



Genera, rejection of, 140, 144, 1S7, 229, 256, 270, 356, 516, 

 568, 5S2. 



tlenou (genu, a knee). See Carpopodite. 



Genu. See Isehiopodite. 



Geschlecht, 120. 



Gibbous (Latin gibbosus), protuberant, convex, hump-hacked. 



Gimnocefali (yvy.v6s, naked, KitpaK-fi, head), 145. 



Ginglymus (7/77X11,1105, a joint), a kind of articulation admit- 

 ting of only two motions, as in a hinge or the elbow -joint. 

 In the legs of the Arthropoda, as a rule only flexion and 

 extension of the joints are possible. Latreille, Le Regno 

 Animal, p. 1, 1S17, says of them, "Chaque article est 

 tubuleux, et contient, dans son interieur, les muscles de 

 I'aiticle suivant, qui se meut toujours par gynglyme, 

 c'est-a-dire dans un seul sens." 



Gland (glans, an acorn), "a cell or collection of cells, having 

 the power of secreting or separating some peculiar sub- 

 stance from the blood or animal fluids." Anal-gland, 

 505 ; antennary gland, 372, 4S1, 506, 510, 549 ; cement- 

 glands, 432, 496, 522, 1651 ; frontal-gland, 477, 478 ; 

 hand or leg-glands, 432, 4S3, 489, 496, 51S, 519, 1651 ; 

 liver-glands, 525 ; oil-glands, 548 ; renal-glands, 504, 

 506, 549, 552 ; salivary-glands, 4S9, 538 ; sexual-glands, 

 ovigerous and spermatic, 535. 



Gliedfussler. See Arthropoda, 544. 



Gnathapteres (yvdBos, jaw, Aptera, wingless), 65. 



Gnathopoda {yvdOos, jaw, Ws, a foot), 2S9, 332, 362, 394, 

 487, 516 ; a term proposed by Milne-Edwards, and in 

 1S56 adopted by Bate and Westwood for the appendages 

 of the first and second segments of the person. 

 Gerstaecker objects to the name because in numerous cases 

 he can find no connection between these limbs and the 

 taking up of food, while Clans retains it because in so 

 many cases there is such a connection. The equivalents 

 are — first and second pairs of anterior feet or legs, 81, 82, 

 84, 90, 100, 141, 179, 186 ; claws, 101 ; piedi-mani, 145, 

 150; Pedes thoracici primi et secundi pans, 211, 217, 

 284, 2S6 ; Mamis or hands, 220 ; first and second pairs 

 of feet, 286, 323, 326, 347, 351, 376, 397 ; Pedes trunci 

 primi et secundi paris, 360 ; pattes thoraciques, 3S3, 417 ; 

 quatrienie et cinquieme siagonopodes, 454 ; Handbeine, 

 427 ; first and second pereiopods, 516 ; second and third 

 pairs of appendages, 563. 



Gnathopoda, a name proposed by H. Woodward for the 

 Eutomostraca, "in allusion to the prevailing character 

 in the Eutomostraca, in which the head and mouth-organs 

 ■■we also mainly used in locomotion " (Encycl. Brit., art. 

 Crustacea, 1S78). 



Gnathopoda, = Arthropoda, 47-. 



Gnathopodes, Straus-Durekheini, 134. 



Greifhand, subchelate hand, 487, 537, 597. 



Greifzange, chelate hand, 4S7. 



Gynmobranches (yup.v6s, naked, fipdyx'a, breathing-organs), 

 " branchies exterieures, ou ineonnues," the character, 

 " branchies cachees ou ineonnues," found in Risso's defini- 

 tion in 1S16, was probably due to a slip of the pen, 96. 



Haltopoden (aWofia, I leap, ttovs, a foot), 1654. See Uropods. 



Handle, 93, 140, 155. See Basipodite. 



Hand. See Propodite. 



Heart, 1S4, 219, 280, 304, 338, 350, 364, 372, 383, 422, 471, 

 476, 480, 489, 505, 526, 549, 598. 



Hcdrioftalmos, 1632. 



Hedriopbthalma, 477. 



Hedriophthalmata, 473. 



Hepato-pancreas (rjirap, the liver, irdyKpeas, the sweetbread), 

 525, 1636. 



Heterobranohia (eVepor, other, Ppdyxia, breathing-organs), 131. 



Heteropa (erepoVous, with uneven feet, or ertpos, other, irovs, 

 foot, with the feet varied), the definition given by 

 Latreille does not well accord with the apparent meaning 

 of the name, 125, 126, 138. 



Histology (ioro's, a web or tissue, \6yos, discussion), "the 

 science which treats of the minute structure of the tissues 

 of plants, animals, etc.," 535. 



Homology (S/ioKoyia, agreement), conformity in the plan of 

 organisation, correspondence in type of structure; thus 

 the arm of a man is homologous with the foreleg of a 

 horse, the maxillipeds of an Amphipod with its gnatbo- 

 pods, and its gnathopods with the second and third 

 maxillipeds of a crayfish. Analogy, on the other hand, 

 is correspondence not in type but in function, as the legs 

 of an Amphipod and the legs of a horse are alike 

 denominated legs from analogy, because of their applica- 

 tion to similar purposes. 280, 289, 462, 473. 



Hiifte, 485. See Basipodite. 



Hiiftglied, 365. See Cokopodite. 



Hyperexapi (v-wip, over, ?{, six, n6Ses, feet), 125. 



Hypodermis, 503, 597, 1652. 



Hypopharynx {mo, under, <pdpvy%, the throat), the floor of the 

 throat, between the mouth-opening and the oesophagus. 



Hypostome (tW, under, ar6p.a, the mouth), the ventral piece 

 of the mouth, in which the two pairs of maxilla' are 

 socketed, and which supplies a fulcrum to the labium. 

 From its analogy to the os sphenoideum of vertebrates 

 Scliipilte (Naturh. Tidssk., ser. 3, Bd. iv. 1866) proposes 

 to call it the sphenoid plate. 



Imbricated (imbrex, a tile), said of plates overlapping one 

 her in order like tiles'on a roof. In the Amphipoda 

 the segments of the body overlap from before backwards, 

 ml when the hinder edges are notably raised the struc- 

 ture is said to be imbricated. 



Incubatory pouch, also called incubatory lamella;, appendices 

 flabelliformes, marsupial plates, marsupium, ovigerous 

 lamella?, oostegites, ovarial plates, scales (Schuppen). 

 These plates are developed in the female of the Gamma- 

 rina within the side-plates of the second, third, fourth, 

 (and occasionally the fifth) segments, between the 

 branchial vesicles and the body. They are generally 

 fringed with long hairs. When needed for use they fold 



