460 



A HISTOEY OF RECENT CRUSTACEA 



PLA 



depressa, squamosa, tomentosa, 



99 

 Plakarthrium typicum, 36 

 Planes minutus, the gulfweed 



crab, 9o, 99 

 Plastron, 52 

 Platj^arthrus 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 VVyville-thomsoni, 110 

 Platymera, 425 

 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 

 PleurobranchiiB, 134 

 Pleurocrypta, galatese, Hender- 



sonii, porcellanffi, strigosa, 410 

 Pleurogonium, 380 ; inerme, rubi- 



cundum, spinosissimum, 381 

 Pliny's opinion about Pinnotheres, 



100 

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

 Podascon Dellavallei, 401 

 Podobranchiae, 134 

 Podocopa, a suborder of Ostracoda, 



10 

 Podophthalma, the order, 7 ; de- 

 fined, 51 

 PodophthalmidEe defined, 71 

 PodophLhalmus 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, 



£00 

 Polyonyx, 171 

 Pomatocheles, 170 

 Pontocaris, 228 

 Pontonia, custos, 241 ; melea- 



grinae, 242 

 PontoniidfB defined, 241 

 Pontophilus spinosus, 226 ; larval 



forms of, 227 

 Pontostratiotes abyssicola, an 



abyssal copepod, 20 

 Porct-llana, 47 ; longicornis, platy- 



cheles, 171, 172; Robertsoni, 



173; Creplinii, 406 

 Porcellanella, 171 

 Porcellanidie, 47, 171 

 Porcellaninea defined, 171 

 Porcellanides, 171 

 Porcellio,cristatus,dilatatus,l£evis, 



lamellatus, Marioni, pictus, pro- 



vincialis, scaber, spinicornis, 



427 ; laevis, scaber, extensive 



distribution of, 428 

 Porciqnne, the, Isopoda of, 321, 



326 

 Portumnus, 66 ; latipes, variega- 



tus, 67 

 Portunidse defined. 65 

 Portunion mtenadis, 407 ; Frais- 



sei, Kossmanni, Moniezii, Sal- 



vatoris, 408 

 Portunus, arcuatus, corrugatus, 



depurator, holsatus, marmoreus, 



puber, pusillus^ tuberculatus, 66 

 Potamobia, fluviatilis, pallipes, 



torrentium, 207 

 Potamobiid^e 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, 



palgemoneticola, 416 

 Procletes, biangulatus, EUioti, 254 

 Promysis, 267, 275 

 Propodus, alias propodite, hand, 



or sixth joint, 43 



