INDEX. 



317 



25S-2G0; reparalion after injuries, '_'fiO ; affinities, 

 2G1 ; geograpliical aiul geological distriljution, 202 



Operculina incerta (D'Orb.^, 141 



OrhiaiUnn, genus, !)3-0!l ; its liistory, 03 ; external 

 characters, 94, !)j ; internal structure, !).")-!)/ ; affi- 

 nities, 98 ; geographical and geological distribu- 

 tion, 98 



Orbiculiua adunca, 93 



— angulata, 93 



— Malabarica, 97 



— orbiculus, 93 



Orlitoides, genus, 298-304 ; its history, 298 ; external 

 characters, 298, 299 ; internal structure, 299-302 ; 

 casts of, 300 ; canal-system of, 302 ; affinities, 303 ; 

 geological distribution, 304 



Orbitoidcs dispansus, 298 



— cphippium, 298 



— Fortisii, 300 



— Mantelli, 298, 300 



— Prattii, 298 

 Orbitohna, genus of Lamarck, 224 



— coucava (Lam.), 231 



— conica (D'Arch.), 231 



— gigantea (D'Orb.), 228 



— lenticularis (Blnm.), 231 



— vcsicularis (P. & J.), 224 



OrbifoUtes, g&nns,, 105-12G; its history, 105; external 

 characters, lOG; simple type, external characters, 

 107; internal structure, 107-110; animal, 110- 

 112 : — co»ipte.c type, external characters, 112-114; 

 internal structure, 114-118; animal, 115, IIC; 

 reparation of injuries, 118-120; varieties, 120- 

 123; monstrosities, 123 ; affinities, 124-12G; geo- 

 graphical and geological distribution, 12G; re- 

 production, 37, 38 



OibitoUtcs, macropora, 107 



— Jlalabarica (Cart.), 97 



— marginalis, 107 



OrLulina, genus, 176-178; its history, 17(); external 

 characters and internal structure ; 170, 177; sup- 

 posed relation to Globigeriua, 177, 178; affinities, 

 1/8 ; geographical and geological distribution, 

 178 ; formation of ova, 39 



Orders of Rhizopoda, 15-17 



Ortkocerina, genus, IGIJ; its history, ICG; external 

 characters and internal structure, ICG; affinities, 

 ICG ; geographical and geological distribution, IGC 



Ova, supposed, of Foraminifera, 3G, 39 



Ovttlites, genus, 179; its history, 179; external cha- 

 racters and internal structure, 179 ; affinities, 

 179; geological distribution, 180 



Ovulites clongata (Lam.), 179 



— niargaritula (Lam.), 178 



P. 



Pamphagus mutabilis (Bailey), 28 



Patellina, genus, 229-235 ; its history, 229 ; external 

 characters and internal structure, 230-234 ; affi- 

 nities, 234 ; geographical and geological distribu- 

 tion, 235 



Patellina concava, 231 



— Cooki, 233 



— corrugata, 230 



PeneropUs, genus, 84-93 ; its history, 84 ; external 

 characters, 84-80 ; internal structure, 8G ; varieties, 

 87-91; dendritine form, 88, 91; spiroline form, 

 88, 89 ; affinities, 91 ; geographical and geologi- 

 cal distribution, 92 



Perfok.\t.\, sub-order, Gl, 149 



Perforated shells of Foraminifera, 45, 4G 



Placentula pulvinata (Lam.), 210 



Plaffiopknjs, 20 



Placopsilina cenomana (D'Orb.), 143 



Plan of growth, value of as differential character, 48-55 



Plamrbulina, genus, 200, 2UG-209 ; its history, 199, 

 200 ; external characters and internal structure, 

 20C, 207; truneatuliue form, 207; varieties, 208, 

 209 ; affinities, 209 ; geographical and geological 

 distribution, 209 



Planorbulina farcta, 206 



— meditcrranensis, 206 



— retinaculata, 209 



— vulgaris, 208, 209 

 Planularia (Defr.), ICO 

 Planulina (D'Orb.), 200, 207 

 Podostoma, 25, 26 

 PoLYCYSTix.i, family, 21 



Pohjmorpltina, genus, 1G6-1G9; its history, 106-16/ ; 

 external characters and internal structure, 1G7, 

 168; affinities, 168, 169; geograpliical and geo- 

 logical distribution, 169 



Polyniorpliina lactea, 1G7 



— myristiformis, 1C7 

 Polymorphism of Foraminifera, 54, 55 

 Fulystomella, genus, 27C-288 ; its history, 276 : — 



P. crispa, external characters, 278 ; internal struc- 

 ture, 278, 279 : — P. cratkulata, external cha- 

 racters, 279, 280 ; internal structure, 280-285 ; 

 casts, 280, 283 ; canal-system, 283-285 ; relation 

 to P. crispa, 285, 2S6 ; nonionine sub-genus, 

 286 ; affinities, 287 ; geographical and geological 

 distribution, 287, 288 

 Polystomella gibba, 286 



— niacella, 286 



