828 



INDEX OF GENERA. 



Pleurorima, 645 

 Pleurotoma, 800 

 Pleurotomariidse, 627 

 Pleurotomidse, 800 

 Plicatula, 508 

 Poletimita, 667 

 Polorthus, 578 

 Polygyra, 822 

 Polypora, 148 

 Polyzoa, 107 

 Porcellia, 627 

 Porifera, 13 

 Potamides, 749, 750 

 Prasopora, 129 

 Prionodesmacea, 375 

 Prismodictya, 15 

 Prismopora, 162 

 Proboscina, 118 

 Productella, 240 

 Productus, 243 

 Prothyris, 377 

 Protocardia, 560 

 Protorthis, 211 

 Protospirialis, 671 

 Protowarthia, 611 

 Protozoa, 7 

 Protremata, 209 

 Pseudolathyrus, 778 

 Pseudomonotis, 450 

 Psiloconcha, 386 

 Pteria, 445 

 Pterinea, 419 

 Pterinopecten, 492 

 Pterocerella, 755 

 Pterochaenia, 428 

 Pteronites, 446 

 Ptilodictya, 155 

 Ptilograptus, 27 

 Ptilopora, 151 

 Ptomatis, 624 

 Ptychodesma, 455 

 Ptychomya, 542 

 Ptychophyllum, 62 

 Ptychopteria, 449 

 Pugnax, 295 

 Pugnellus, 755 

 Pulmonata, 811 

 Pupa, 820 

 Pupadae, 820 

 Purpuridae, 787 

 Pycnomphalus, 672 

 Pycnostylus, 61 

 Pyramidellidae, 709 

 Pyramidula, 822 

 Pyrgulifera, 741 

 Pyropsis, 765 

 Pyrula, 760 



Radiolaria, 12 

 Radiolites, 552 

 Rafinesquina, 211 

 Raphistoma, 627 



Raphistomina, 629 

 Receptaculites, 18 

 Rensselaeria, 300 

 Reptaria, 120 

 Requienia, 546 

 Reteporidra, 147 

 Reticularia, 337 

 Retiolites, 34 

 Retzia, 344 

 Rhinidictya, 158 

 Rhinoclavis, 749 

 Rhipidomella, 262 

 Rhombopora, 153 

 Rhombotrypa, 131 

 Rhopalonaria, 116 

 Rhynchonella, 297 

 Rhynchopora, 297 

 Rhynchospira, 344 

 Rhynchotrema, 281 

 Rhynchotreta, 282 

 Rhytimya, 526 

 Rhytophorus, 814 

 Rimella, 757 

 Ringicula, 808 

 Ringiculidae, 807 

 Ringinella, 808 

 Rissoidae, 722 

 Rissoina, 722 

 Roemerella, 205 

 Romingeria, 79 

 Rostellites, 792 



Saffordia, 384 

 Salpingostoma. 614 

 Sanguinolites, 376 

 Saxicava, 575 

 Scala, 710 

 Scalaria, 710 

 Scalariidse, 710 

 Scalaripora, 163 

 Scalaspira, 785 

 Scalites, 630 

 Scaphandridae, 810 

 Scaphopoda, 578 

 Scenella, 608 

 Scenidium, 270 

 Schizobolus, 203 

 Schizocrania, 202 

 Schizodesma, 573 

 Schizodus, 482 

 Schizolopha, 637 

 Schizophoria, 267 

 Schizoporella, 170 

 Schizotreta, 205 

 Schuchertella, 228 

 Seila, 749 

 Semele, 568 

 Sernicoscinium, 143 

 Seminula, 354 

 Septastrsea, 100 

 Sieberella, 278 

 Sigaretus, 715 



Siliqua, 569 

 Siliquaria, 738 

 Siphonalia, 762 

 Siphonariidae, 811 

 Siphonodentaliidse, 581 

 Solariidae, 711 

 Solarium, 711 

 Solemya, 375 

 Soleniscus, 699 

 Solenospira, 653 

 Solyma, 570 

 Sphaerium, 544 

 Sphaerodoma, 701 

 Sphenotus, 524 

 Spirifer, 315 

 Spiriferina, 314 

 Spiroraphe, 645 

 Sponges, 13 

 Staurograptus, 27 

 Stenochisma, 288 

 Stenopora, 134 

 Stenotheca, 607 

 Stereolasma, 56 

 Sthenorhytes, 711 

 Stictoporella, 157 

 Stictotrypa, 166 

 Stomatopora, 118 

 Straparollina, 653 

 Straparollus, 654 

 Streblotrypa, 155 

 Strepsidura, 770 

 Streptaxis, 695 

 Streptelasma, 54 

 Streptolathyrus, 777 

 Striatopora, 94 

 Stricklandinia, 274 

 Stromatocoerium, 46 

 Stromatopora, 44 

 Stromatoporella, 42 

 Stromatoporoidea, 34 

 Stromatotrypa, 137 

 Strombidae, 755 

 Strombodes, 70 

 Strombus, 757 

 Strophalosia, 239 

 Stropheodonta, 212 

 Strophomena, 222 

 Strophonella, 220 

 Strophostylidae, 676 

 Strophostylus, 677 

 Styliferina, 747 

 Stylodictyon, 41 

 Subulites, 696 

 Subulitidae, 696 

 Surcula, 800, 802, 803 

 Sycotypus, 769 

 Synaptophyllum, 73 

 Syncyclonema, 507 

 Syntrophia, 270 

 Syringopora, 82 

 Syringostroma, 44, 45 

 Syringothyris, 341 



