4.60 
PLA 
depressa, squamosa, tomentosa, 
99 
Plakarthrium typicum, 36 
Planes minutus, 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 o7 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 
Pleurobranchiez, 134 
Pleurocrypta, galatez, Hender- 
sonii, porcellane, strigosa, 410 
Pleurogonium, 380; inerme, rubi- 
cundum, spinosissimum, 381 
Pliny’s opinion about Pinnotheres, 
100 
Pocock, Mr. R. I., 184, 197 
Podascon Dellavallei, 401 
Podobranchiz, 134 
Podocopa, a suborder of Ostracoda, 
10 
Podophthalma, the order, 7; de- 
fined, 51 
Podophthalmidz defined, 71 
Podophthalmus vigil, battledore 
‘front’ of, 71 
Peecilostoma, a suborder of Cope- 
poda, 10 
Polperro, the geographical position 
of, 326 
Polybius Henslowii, a great abun- 
dance of, 68 
Polycarpinea defined, 228 
A HISTORY OF RECENT CRUSTACEA 
PRO 
Polycheles,199; baccata, typhlops, 
200 
Polyonyx, 171 
Pomatocheles, 170 
Pontocaris, 228 
Pontonia, custos, 241; 
grinz, 242 
Pontoniide defined, 241 
Pontophilus spinosus, 226; larval 
forms of, 227 
Pontostratiotes abyssicola, an 
abyssal copepod, 20 
Porcellana, 47 ; longicornis, platy- 
cheles, 171, 172; Robertsoni, 
173; Creplinii, 406 
Porcellanella, 171 
Porcellanidez, 47, 171 
Porcellaninea detined, 171 
Porcellanides, 171 
Porcellio,cristatus, dilatatus, levis, 
lamellatus, Marioni, pictus, pro- 
vincialis, scaber, spinicornis, 
427; levis, scaber, extensive 
distribution of, 428 
Porcupine, the, Isopoda of, 321, 
326 
Portumnus, 66; 
tus, 67 
Portunidz defined, 65 
Portunion menadis, 407 ; Frais- 
sei, Kossmanni, Moniezii, Sal- 
vatoris, 408 
Portunus, arcuatus, corrugatus, 
depurator, holsatus, marmoreus, 
puber, pusillus, tuberculatus, 66 
Potamobia, fluviatilis, pallipes, 
torrentium, 207 
Potamobiide defined, 206 
Potamonautes, 76 
Praniza, synonym of Gnathia, 237 
Praunus, 267 ; integer, 270; flexuo- 
sus, inermis, neglectus, 271 
Preguediou, 282 
melea- 
latipes, variega- 
Priority, recognition of, advo- 
cated, 203 
Probopyrus, ascendens, Giardi, 
palzmoneticola, 416 
Procletes, biangulatus, Ellioti, 254 
Promysis, 267, 275 
Propodus, alias propodite, hand, 
or sixth joint, 43 
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