460 



A HISTORY OF KECENT CEUSTACEA 



PLA 



depressa, squamosa, tomentosa, 



99 

 Plakarthrium typioum, 36 

 Planes minutus^ the gulfweed 



crab, 95, 99 

 Plastron, 52 

 Platyarthrus Hoffmannseggii, in 



ants' nests, 429 

 Platyaspis typioa, 309 

 Platybema, 233 ; explanation of 



the name, 234 ; planirostris, ru- 



gosum or ragosus, 235 

 Platycopa, a suborder of Ostra- 



coda, 10 

 Platygrapsus, 94 



Platymaia Wyville-thomsoni, 110 

 Platymera, 125 

 Platyoniohus, bipustulatus, iri- 



descens, oceUatus, 67 

 Platysacns, larval form of Ser- 



gestes, 221 

 Pleon, 45 

 Pleopods, 45 

 Pleoticus, 218 



Plesionika uniproduota, ophthal- 

 mic segment in, 34 

 Pleuracantha preoccupied, 380 

 Pleurobranchias, 134 

 Pleurocrypta, galatese, Hender- 



souii, porcellanae, strigosa, 410 

 Plenrogonium, 380 ; inerme, rubi- 



cundum, spinosissimum, 381 

 Pliny's opinion about Pinnotheres, 



100 

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

 Podascon Dellavallei, 401 

 Podobranohise, 134 

 Podooopa, a suborder of Ostracoda, 



10 

 Podophthalma, the order, 7 ; de- 

 fined, 51 

 Podophthalmidas 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 

 Polyoarpinea defined, 228 



PRO 



Polycheles,199 ; baccata, typhlops, 



200 

 Polyonyx, 171 

 Pomatocheles, 170 

 Pontocaris, 228 

 Pontonia, cnstos, 241 ; melea- 



grinse, 242 

 Pontoniidse defined, 241 

 Pontophilus spinosus, 226 ; lai-val 



forms of, 227 

 Pontostratiotes abyssicola, an 



abyssal oopepod, 20 

 Porcfllana, 47 ; longioornis, platy- 



cheles, 171, 172; Robertsoni, 



173 ; Creplinii, 406 

 Porcellanella, 171 

 PorcellanidEB, 47, 171 

 Porcellaninea defined, 171 

 Poroellanides, 171 

 Porcellio,cristatus,dilatatus,lsevis, 



lamellatus, Marioni, pictus, pro- 



vincialis, scaber, spinicornis, 



427 ; Isevis, scaber, extensive 



distribution of, 428 

 PoToujnne, the, Isopoda of, 321, 



326 

 Portumnus, 66 ; latipes, variega- 



tus, 67 

 Portunldae defined, 65 

 Portanion msenadis, 407 ; Frais- 



sei, Kossmanni, Moniezii, Sal- 



vatoris, 408 

 Portunus, arcuatus, corrngatus, 



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 

 Pregaediou, 282 



Priority, recognition of, advo- 

 cated, 203 

 Probopyrus, asoendens, Giardi, 



palsemoneticola, 416 

 Procletes, biangulatus, ElUoti, 254 

 Promysis, 267, 275 

 Propodus, alias propodite, hand, 



or sixth joint, 43 



