INDEX 



ccxlv 



platychora, Apedogyria, PI, 5 ; PI. 4, fig. 8, p. 22 

 (Lioceras bradfordense) ; Suppl., PI. 11, fig. 

 33 ; p. lx 

 Platygraphoceras, Suppl., p. xciii ; apertum, 

 carbatinum, compactum, latum, sp. 



Platygraphoceras, from Graplioceras, xcv ; classi- 

 fication, cxcviii 



Platygyral, iii, cxcvii 



platystomum, Stcphanoceras, 312 



plectile, Lioceras, Suppl., PI. 9, figs. 10-12, p. 

 xxxix 



Pleuroceras, 286, 287, 288, 295, 300, 301, 314; 

 hawskerense, pseudocostatum, * spinatum, 

 subspinatum, vittatum ; allied to Sonninia, 

 110; prior use of name for a genus of Gastero- 

 poda, Haug's note, 288 ; and Amaltheus, 

 separation of characters of, 288 ; spp. of, com- 

 pared to Zurcheria, 295 ; from Sonninia, 314 



Pleydellia, Suppl,, p. cxxxvii ; aalensis, fluens, 

 comata, leura, mactra, sp., subcompta 



Pleydellia, from Walkeria, cxxxix ; classification, 

 cxcviii 



plicata, Sonninia, PI. 97, figs. 6 8 ; Figs, in text, 

 18, p. 388 ; 44, p. 415 ; 70, p. 443 ; p. 415 



plicata, Terebratula, 7, 43 



plicatellum, Lioceras, Suppl., PI. 8, figs. 10-12 ; 

 PI. 9, figs. 7-9 ; p. xxxviii 



plicatum, Cypholioceras, Suppl., PI. 8, figs. 7-9, 

 p. xlv ; and ? PI. 14, figs. 5,6, p. 54 (Lioceras 

 opalinum var. comptum) ; p. cxxx 



Plottii, Clypeus, 7 



Podagrosi, 109, x 



Pcecilomorphus, p. 115 ; Suppl., p. cxciii ; cy- 

 cloides, macer, mercati 



Poecilomorphus, classification, cxcviii 



Pcecilomorphy, acme of, cxcix 



polita, Darellia ?, PI. 16, figs. 3-6, p. 92 (Hyper- 

 lioceras Walkeri) ; Suppl., PL 18, fig. 31 ; p. 

 cxiv 



polyacanthum, Hammatoceras (Sonninia), 453 



polyacanthus, Ammonites, remarks upon, propor- 

 tions of, 376 ; Sonninia, 375, 376 



Poly genetic, specimens, 257 ; forms, how dis- 

 tinguished, xcviii 



Polygyral, ii 



Polymorphidae, 231, 266, 267, 269 ; revision, clxix ; 

 resume of, 281 ; genealogy of (Table V), 282, 

 293 ; radial lines, cxcvi ; classification, cxcviii 



Polymorphism, 243 



Polymorphites, p. 267 ; Bronni, confusus, norma, 



peregrinus, polymorplms, p. costatus, p. line- 



atus, senescens, vernosae, zitteli 

 Polymorphites, from allies, 267 ; classification, 



cxcviii 

 polymorplms, Polymorphites, 161, 232, 234, 266, 



267, 283, 284, 289 

 polymorplms costatus, Polymorphites, 267, 283 

 polymorplms lineatus, Ammonites, 289 ; Poly- 

 morphites, 232, 267, 283 

 Polyphyletic origin of similar peripheries, cxv 

 Polyplectus, p. 214 ; Suppl., p. clvii ; discoides 

 Polyplectus, classification, cxcviii 

 Polyzoa, 43 



Port-en-Bessin, strata of, ccvi 

 Portree, lxx 



Posidonomya Bronni, zone of, 50 

 Post-nodate stage ((Ecotraustes), cxcv 

 *praestabilis, Amaltheus, PI. 49, fig. 3 ; nudus, 



Amaltheus 

 prajstabilis, Amaltheus, 287 



Prefiguration, morphological, 315 ; morphic, cciii 

 Primary ribs, 16 

 primordialis, Ammonites, 35, 55 

 prisca, Dumortieria, PI. 37, figs. 9-11, p. 236 ; p. 



clxxii 

 prisca, Dumortieria, clxxiii 

 Prisca style of ribbing, clxxxiv 

 procera, Chemnitzia, 164 

 procerus, Perisphinctes, 272 

 Progression, in development, 289 ; of ventral area, 



299 

 Progressive decline, of rostration, lxxx ; of costa- 



tion, umbilicus, compression, lxxxix 

 projecta, Braunsina, Suppl., PI. 20, figs. 7-9 ; p. c 

 propinquans, Ammonites, 143 ; Sonninia, 450 

 Proportional triangles, cxcvii 

 Prorsicostate (series, Pontannesia), cxci 

 Prorsiradiate, iii 

 Prorsiradius, iii 

 Prorsutn, iii 

 Prosiphonata, 126 

 proximum, Harpoceras, 158 

 Prussia, Grammoceras in, 169 

 psamminum, Catulloceras, PI. xli, figs. 7, 8, p. 248 



(Dumortieria radians) ; Suppl., p. clxxi 

 pseudocostatum, Pleuroceras, 287, 291, 295 



