44 Index to Desors Synopsis. 



Periaster, 382 : aeqiiifissus, altissimus, bucardium, bucklandi, canaliculatus, com- 

 planatus, conicus, clatus, expansus, fourneli, herklotsi, inaequalis, inflatus, 

 latisulcatus, leymerii, obesus, oblongus, passyaiuis, rana, spatangoïdes, 

 subglobosus, suborl)icularis, subquadratus, texanus, undulatus, verticalis. 



Pericosmus, 396 : aequalis, altus, asperulatus, brevisulcatus, distinctus, edwardsii, 

 elatus, granulosus, latus, parvus, planulatus, pomum, rotundatus, scuti- 

 formis. 



Perischodomus, 157 : biserialis. 



Phymechinus, 133 : mirabilis. 



Phymosoma, 102 : beaumonti, carantonianum, circinatum, corollare, delamarrei, 

 dimidiatum, girumnense, granulosum, heberti, koenigii, loryi, magnificum, 

 neocomiense, nummuliticum, paucituberculatum, perfectum, princeps, rcgularc, 

 rugosum, saxatile, sulcatum, texanum. 



Pileus, 167 : hemisphaericus. 



Plagionotus, 405 : pectoralis. 



Plotia, 50 (1855). ^ ^^\ ' 



Podophora, 132. v 



Polycidaris, 437 : multiceps. 



Polycyphus, 117: arenatus, benettiae, buchii, corallinus, deslongchampsii, dis- 

 tinctus, nodulus, nodulosus, normannus, stellatus, textilis. 



Porocidaris, 46 : schmidelii, serraria, serrata, veronensis. 



Prenaster, 401 : alpinus, birostratus, elongatus, helveticus, jutieri, per- 

 plexus, sorigneti, sowerbyi, subacutus. 



Psammechinus, 118: alutaceus, caillaudi, catenatus, charlesworthii, duciei, 

 fallax, gravesii, henslovii, homocyphus, hyselyi, michelottii, miliaris. 

 minimus, mirabilis, monilis, montmollini, parvus, rathieri, romanus, ruffini, 

 serresii, spadae, tenuis, theveneti, woodwardii. 



Pseudodiadema, 63 : aequale, affine, annulare, aroviente, bailyi, bakeriae, benettiae, 

 blancheti, blanggianuin, bourgueti, brongniarti, bruntrutanum, carinella, 

 carthusianum, complanatum, depressum, diatretum, drogiacum, foucardi, 

 frasii, granulare, grasii, guerangeri, hemisphaericum, homostigma, inflata 

 lybicum var., inaequale, kleinii, langii, lenticulatum, lucae, lusseri, lybicum, 

 macrostoma, mamillanum, mamilatum, michelini, miliare, neglectum, neoco- 

 miense, nysti, orbignyanum, ornatum, parkinsoni, pentagonum, periqueti, 

 picteti, pingue, piniforme, placenta, planissimum, princeps, prisciniacense, pul- 

 chellum, radiatum, rathieri, raulini, repellini, rhodani, roemeri, rotulare, ruppellii, 

 sismondae, subangulare, subcomplanatum, superbum, tenue, tetragramma, 

 tetrasticha, texanum, textum, triseriale, uniforme, vagans, verneuilli, versipora, 

 waldense, wrightii. 



Pseudopedina, 490 : divionensis, nodoti. 



Pygaster, 164 : conoideus, costellatus, depressus, dilatatus, edwardseus, gresslyi, 

 koechlini, laganoïdes, macrocyphus, morrisii, patelliformis, pileus, pumilus, 

 semisulcatus, tenuis, trigeri, truncatus, umbrella. 



Pygaulus, 251 : affinis, columbaris, cylindricus, depressus, desmoulinii, expansus, 

 macropygus, morloti, ovatus, pulvinatus, sentisianus, studeri, subaequalis, 

 subinferus, toucasanus, zonatus. 



l'ygorhynchus, 297 : brongniarti, coUombi, crassus, cuvieri, delbosii, depressa 

 crassus var., dcsmoulinsii, desnoyersii, desorii, clatus, gouldii, grignonensis, 

 heptagonus, inflata scutella var., jamaicensis, latus, linkii, morrisii, 

 mortonis, obovatus, planatus, rostratus, scutella, sopitianus, subcarinatus, 

 subcylindricus, subrotundus, testudo, tumidus, vassalli, wrightii. 



Pygurus, 309 : acutus, apicalis, blumenbachii, coarctatus, columbianus, conicus, 

 depressus, emarginatus, faujasii, florealis, fragilis, fungiformis, geometricus, 

 hausmanni, icaunensis, jurensis, lampas, marmonti, meyeri, michelini, 

 miner, montmollini, morloti, nasulus, obovatus, orbiculatus, orbignyanus, 

 oviformis, pentagonalis, productus, pulvinatus, ricordeanus, rog^erianus, 

 rostratus, tenuis, trilobus. 

 Pyrina, 190 : ataciana, bargesana, campichcana, castanea, cylindrica, depressa, 

 depressa pygaea var., dcsmoulinsii, echinonea, freuchcnii, goldfussii, incisa, 

 inflata, laevis, montainvillensis, nucleus, orbignyana, ovalis, ovata, ovulum, 

 paumardi, petrocoriensis, pygaea, raphaeli, rotula, toucasana. 



Rabdocidaris, seu Rhabdocidaris, 39 : blainvillei, copeoïdes, crassa, crenata, cris- 

 tata, gigantea, guttata, junonis, maxima, megalacantha, mitrata, moraldina, 



