460 



A HISTORY OF RECENT CEUSTACEA 



PLA 



depressa, squamosa, tomentosa, 

 99 



Plakarthrium typicum, 36 

 Planes rninutus, the gulfweed 



crab, 95, 99 

 Plastron, 52 

 Platyarthrus Hoffmannseggii, in 



ants' nests, 429 

 Platyaspis typica, 309 

 Platybema, 233 ; explanation of 

 the name, 234 ; planirostris, ru- 

 gosum or rugosus, 235 

 Platycopa, a suborder of Ostra- 



coda, 10 



Platygrapsus, 94 



Platymaia Wyville-thomsoni, 110 

 Platymera, 125 

 Platyonichus, bipustulatus, iri- 



descens, ocellatus, 67 

 Platysacus, larval form of Ser- 



gestes, 221 

 Pleon, 45 

 Pleopods, 45 

 Pleoticus, 218 



Plesionika uniproducta, ophthal- 

 mic segment in, 34 

 Pleuracantha preoccupied, 380 

 Pleurobranchias, 134 

 Pleurocrypta, galatete, Hender- 

 sonii, porcellanfe, strigosa, 410 

 Pleurogonium, 380 ; inerrne, rubi- 



cundum, spinosissirnum, 381 

 Pliny's opinion about Pinnotheres, 



100 



Pocock, Mr. R. I., 184, 197 

 Podascon Dellavallei, 401 

 Podobranchice, 134 

 Podocopa, a suborder of Ostracoda, 



10 



Podophthalma, the order, 7 ; de- 

 fined, 51 



Podophthalmidse defined, 71 

 Podophthalmus vigil, battledore 



'front' of, 71 

 Poecilostoma, a suborder of Cope- 



poda, 10 

 Polperro, the geographical position 



of, 326 



Polybius Henslowii, a great abun- 

 dance of, 68 

 Polycarpinea defined, 228 



PRO 



Polycheles,199 ; baccata, typhlops, 



200 



Polyonyx, 171 

 Pomatocheles, 170 

 Pontocaris, 228 

 Pontonia, custos, 241; melea- 



grinfe, 242 



PoutouiidEe denned, 241 

 Pontophilus spinosus, 226 ; larval 



forms of, 227 

 Pontostratiotes abyssicola, an 



abyssal copepod, 20 

 Porcellana, 47 ; longicornis, platy- 



cheles, 171, 172; Robertson!, 



173 ; Creplinii, 406 

 Porcellanella, 171 

 Porcellanidas, 47, 171 

 Porcellaninea defined, 171 

 Porcellanides, 171 

 Porcellio,cristatus, dilatatus, lasvis, 



lamellatus, Marioni, pictus, pro- 



vincialis, scaber, spinicornis, 



427 ; lasvis, scaber, extensive 



distribution of, 428 

 Porcupine, the, Isopoda of, 321, 



326 

 Portumnus, 66 ; latipes, variega- 



tus, 67 



Portunidte defined, 65 

 Portunion masnadis, 407 ; Frais- 



sei, Kossrnanni, Moniezii, Sal- 



vatoris, 408 

 Portunus, arcuatus, corrugatus, 



depurator, holsatus, marmoreus, 



puber, pusillus, tuberculatus, 66 

 Potamobia, fluviatilis, pallipes, 



torrentium, 207 

 Potamobiidas defined, 206 

 Potamonautes, 76 

 Praniza, synonym of Gnathia, 337 

 Praunus, 267 ; integer, 270; flexuo- 



sus, inermis, neglectus, 271 

 Preguediou, 282 



Priority, recognition of, advo- 

 cated, 203 

 Probopyrus, ascendens, Giardi, 



palajmoneticola, 416 

 Procletes, biangulatus, Bllioti, 254 

 Promysis, 267, 275 

 Propodus, alias propodite, hand, 

 or sixth joint, 43 



