INDEX OF GENERA. 



213 



Ogygia, 59, 71, 72. 

 Ogygiocaris, 60. 

 Oldhamia, 13, 195. 

 Olenellus, 61. 

 Olenus, 60, 199, 204. 

 Omphyma, 13, 195. 

 Onchus, 192. 

 Oncoceras, 175, 183. 

 Ophileta, 160. 

 Ophioceras, 174. 

 Orbiculoidea, 102. 

 Orbipora, 13. 

 Ormoceras, 175. 

 Orthis, 102, 201, 204. 

 Orthisina, 109. 

 Orthoceras, 175, 187. 

 Orthonota, 138, 202. 

 Ossiculum, 195. 



Pachyocrinus, 22. 

 Pachyphyllum, 13. 

 Pachyspongarium, 194 

 Palaearca, 139. 

 Palsaster, 28, 197. 

 Palffiasterina, 28. 

 Palsechinus, 28, 196. 

 Palseocoma, 28, 197. 

 Palaeochorcla, 1. 

 Palajocrinus, 22, 196. 

 Palaeocyclus, 13, 195. 

 Palaeocystites, 26, 197. 

 Palaeocuscus, 28. 

 Palffioraanon, 4, 194. 

 Palaeonereis, 30. 

 Palasophycus, 1, 194. 

 Palseophyllum, 13. 

 Palaeopyge, 61 . 

 Palaaotrochus, 2. 

 Panderia, 61. 

 Panderella, 6. 

 Parabolina, 61. 

 Paradoxides, 61, 199. 

 Parka, 192, 199. 

 Pasceolus, 19, 192. 

 Patella, 160, 168. 

 Pelliculites, 195. 

 Peltocaris, 76; 

 Peltura, 61. 

 Pemphigaspis, 61. 

 Pentamerus, 110, 202. 

 Pentremites, 22. 

 Periechocrinus, 22. 

 Petraia, 13, 195. 

 Petraster, 28. 

 Phacites, 14. 

 Phacops, 61, 72, 199. 

 Pharostoma, 64. 

 Phasianella, 160. 

 Phanopora, 85. 

 Phialocrinus, 22. 

 Phillipsia, 72. 

 Pholadomya, 202. 

 Pholidops, 112. 

 Phragmoceras, 183, 189. 

 Phragmotheca, 203. 

 Phycodes, 2. 

 Phyllodocites, 197. 

 Phyllograpsus, 200. 

 PhyUopora, 85. 

 Phytopsis, 2, 194. ' 

 Pileopsis, 150. 

 Pilidion, 161, 168. 

 Piloceras, 183. 

 Pisocrinus, 22. 

 Placoparia, 64, 71, 72. 

 Plasmopora, 14, 196. 

 Platyceras, 150. 

 Platychisma, 161. 

 Platycrinus, 22. 

 Platymetopus, 64. 



Platynotus, 65. 



Piatyostoma, 161. 



Platysolenites, 30. 



Platystrophia, 112. 



Plectrodus, 193. 



Plesiacoma, 65. 



Pleurocystites, 26. 



Pleurodictyum, 192. 



Pleurorhynchus, 132. 



Pleurotomaria, 161, 

 168. 



Pliomera, 65. 



Pluinulites, 197. 



Polytomurus, 65. 



Polyeres, 65, 192. 



Polymorphina, 6. 



Polyphemosis, 165. 



Polypora, 85. 



Polytoma, 65. 



Porambonites, 112. 

 Porcellia, 164, 168. 

 Porocrinus, 23. 

 Posidonomya, 129. 

 Poterioceras, 173. 

 Poteriocrinus, 22. 

 Primitia, 76, 200. 

 Proetus,65, 71,72, 199. 

 Propora, 14. 

 Prosopiscus, 66. 

 Protarea, 14, 196. 

 Protaster, 28, 197. 

 Protichnites, 76. 

 Protocrinus, 23. 

 Protocystites, 26. 

 Protospongia, 4. 

 Protovirgularia, 85. 

 Prunocystites, 26. 

 Psammobia, 141. 

 Psammodus, 193. 

 Psephidium, 30. 

 Pseudaxinus, 141. 

 Pseudocrania, 112. 

 Pseudocrinites, 26, 197. 

 Pseudoniscus, 76. 

 Psilocephalus, 66. 

 Pteraspis, 193. 

 Pterinaea, 129. 

 Pterocrinus, 23. 

 Pteropora, 85. 

 Pterotheca, 148, 203. 

 Pterygotus, 76. 

 Ptilodictya, 85. 

 Ptilograpsus, 84. 

 Ptychaspis, 66, 199. 

 Ptychophyllum, 14,196. 

 Ptychopyge, 66, 199. 

 Ptylopora, 86. 

 Pugiunculus, 203. 

 Pyritonema, 30. 

 Pyronomams, 141. 



Raphiophorus,, 66. 

 Eaphistoma, 164. 

 Eastrites, 84. 

 Receptaculites, 4. 

 Redonia, 141. 

 Remopleurides, 67. 

 Rennselaeria, 112. 

 Retepora, 87, 200. 

 Reticulites, 4. 

 Retiocrihus, 23, 196. 

 Retiograptus, 84. 

 Retiolites, 84, 201. 

 Retzia, 112, 202. 

 Rhabdaria, 4. 

 Rhabdinopora, 87. 

 Rhabdopora, 10. 

 Rhinopora, 14, 87, 200. 

 Rhodope, 67. 

 Rhyzophyllum, 14. 



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