1736 



THE VOYAGE OF H.M.S. CHALLENGE!:. 



Piezognatlia (mefa, I press, yva6os, a jaw), 450. 



Pinnulie pediformes, 58. See Pleopods and Uropods. 



Plaxolia (? from ir\a.£, anything fiat and broad), 87, 88. 



Plaxomia, 110. See Plaxolia. 



Pleon ("from n\4a, navigo ; pleon, part which supports the 

 swimming legs," Spence Bate, Brit. Assoc. Report, 1S55, 

 p. 27), all that part of an Amphipod which is behind 

 the perffion. Equivalents are — abdomen, post-abdomen, 

 467; Hinterleib, Schwanz, 181 ; Bovallius restricts the 

 name to the first three segments of the original group, 

 those namely which carry the pleopods, 558. 



Pleopods, abdominal feet, swimming feet, fausses pattcs 

 natatoires, Nektopoden, Schwimmbeine, Schwimmfvisse, 

 pedes spurii natatorii, pleopoda; sometimes applied to 

 all the appendages of the pleon, but more usually re- 

 stricted to the first three pairs, the. three following being 

 called uropoda, 182, 350, 372. They have also been 

 called fausses pattes branchiales. 417. 



Polygnates, 79. 



Polygnathes (iroAvs, many, yvdSos, jaw), 65. 



Polygonata (perhaps from iroAvs, many, and yvaSos, jaw), 64. 



Polymeria (iroAvs, many, pepos, part), 149. 



Procellaria glacialis, the Arctic Petrel, 116, 117. 



Proctodeum, 478. 



Propodite, the sixth (fifth free) joint of the leg. The 

 equivalents are — hand, fifth joint, sixth joint, jambe, 

 main, tarse, metatarse, Hand, Afterhand, Fuss-stuck, 

 maims, pseudomanus, tarsus, metatarsus, metacarpus, 

 propodos, propodus, propus. 93, 104, 140, 155, 290, 532, 

 536. 



Prothorax, the first of the three segments of the insect thorax, 

 homologous with the segment which bears the maxilli- 

 peds in the Aniphipoda. 



Protognathes (irpwros, first, yya8os, a jaw). See Mandibles. 



Protopodite, the basal part of an appendage, comprising the 

 coxopodite and basipodite, to the extremity of which 

 the endopodite and exopodite are attached. See under 

 Endopodite and Peduncle. 



Pyloric (iru\o>pcfs, a gate-keeper), applied to that end of the 

 stomach which is connected with the intestine, 482. 



Punktsubstanz, 489, 567. 



Rectaldruseu, 504. 



Retiuula, 495. 



Retrally, ? from retro, behind, or a misprint for ventrally, 221. 



Rhabdom {papSos, a rod), 495, 1638, 1652. 



Riechzapfen. See Olfactory Organs. 



Rostrum, rostral spine, Riissel, the sometimes strongly pro- 

 duced centre of the head's frontal margin, 467, 497. 



Ruderhaare, Ruderborsten, hairs or seta? of motive value, 477, 

 1245, 1254. 



Salivary gland, 538. 



Saltatorii pedes. See Uropods. 



Schalendruse, 481. 



Schenkel, 485, 491, 1607. See Basipodite and Meropodite. 



Schienbein. See Meropodite. 



Schienenglieder, 485. 



Schlundmagen (Schlund, throat, Magen, stomach), 489. 



Schwanz. See Pleon. 



Scuds, 435. 



Seestengel, sea-stalk, 32. 



Segment. See Annulus. 



Semper'sche Kerne. See Nuclei of Semper. 



Sensitive capsules, 457, 480. 



Sessiliocles ; Lamarck says, "J'ai donne le nom de erustacis 

 sessiliocles aux animaux du second ordre, pareequ'ils out 

 les yeux fixes et sessiles," 66. 



Sessilioclia, 88. 



Seta, sometimes used in Latin, and the earlier English, descrip- 

 tions for the antenuary flagellum, the antenna- with 

 accessory flagellum being cajied bisetse ; the term has 

 been also applied to the rami of the pleopods ; but in 

 later usage it is confined to the more or less hair-like 

 processes of the cuticle, which are developed in various 

 forms, and probably with very varied functions, in 

 different parts of the body, 457, 480, 481, 504 ; Huxley, 

 The Crayfish, pp. 197, 19S, explains their nature and 

 origin. 



Sexes and sexual appendages, 284, 350, 364, 406, 408, 417, 457, 

 542, 548, 597. 



Siagonopodes {aiayav, the jawbone, irois, a foot), 454. See 

 Maxilhe, Maxillipeds, Gnathopods. 



Sinnesborsten, sensitive seta;, 1254. 



Sinus, abdominla, dorsal, pericardiac, ventral, 4S9, 506, 507, 

 526, 527. 



Size of Amphipods, 198, 461, 467, 468, 497, 557. 



Somiologie (aw/j.a, body, \6yos, discussion), 87. 



Somite (<r«/ta, body), 463, 655. See Annulus. 



Somobiques (a-aijua, body, fSlos, life), 88. 



Spermatogenesis, 520, 563, 1638. 



Stemmata, simple eyes, 92, 104, 154, 199, 306, 553, 1652. In 

 Ampclisca the four eyes ordinarily observed are ex- 

 ternally simple, but internally their structure is com- 

 plicated ; Delia Valle speaks of a third pair of rudi- 

 mentary eyes in some species, which may perhaps be 

 properly described as Stemmata. 



Stenotherm (o-tcco's, narrow, Oep/xy, heat), 421. 



Sternum (a-repvov, the breast or chest), the ventral portion of a 

 segment or somite. 



Stomodrcum, 478. 



Strudelorgane, instruments for exciting a current or eddying 

 of water, 477. 



Stylets, abdominal, caudal, posterior. See Uropods. 



Subchelate, subcheliferous, 80, subcheliform. "By a sub- 

 chelate hand is meant one in which the finger folds 

 upon the hand, but in which the inferior angle of the 

 palm is not produced into an antagonistic thumb " 

 (Brit. Sess. Crust., vol. i. p. 51). Complexly sub- 

 chelate. " By this term I mean, whenever the chelate 

 character depends upon other joints than the propodos " 

 (Brit. Mus. Catal. Amph. Crust , p. 262). 



Submoniliform, 101. See Moniliform. 



Subulate, awl-shaped. 



Sugeskaaler, suckers. See Calceolus. 



Swimming, 167, 168, 274, 527, 57S. 



Syncerebrum, 567. 



Synistata (awiaTrini, I unite), 40, 62, 63. 



Systole (<ri/ffToAi), a contracting), 506. 



Tactile bristles, 481, 504. 



Tanaidffi, 201, 527, 544, 549, 554, 587. 

 I Tanaidea, 576, 579. 



