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 Old Red sandstones, 110 Olenellus, 128 Oneida county, 86, 89 Onondaga county, 89 Ontario, 87, 92 Ontogeny, 113–23 Onychopterus, 133, 150, 159, 212 kokomoensis, 91 See also Eurypterus Orange county, 6, 87, 105 Orbiculoidea, 99, 111 Oriskany creek, 421 Orthis clegantula, 100 Orthoceras, 99 Orthothetes interstriata, 180 Osborn, A. O., mentioned, 387 Ostracophora, 84 Otisville, 6, 49, 83, 84, 87, 104, 113, 124, 132, 168, 169, 417 Otisville basin, 8 Otsego county, 89 Owen, R., cited, 33, 72, 433

Packard, A. S., cited, 40, 120, 136, 433, 434, 435 Paedeumias, 128 Page, D., cited, 278, 432 Palaeophonoidae, 393 Palaeophonus, 141, 142, 143, 147, 387, 394, 396, 398, 399, 400 hunteri, 142, 143, 397 figure, 395 loudonensis, 397 nuncius, 143, 147, 301, 394, 397, 400 figures, 142, 395, 399 osborni, 387 Paradoxides, 122 Parker, G. H., cited, 41 Patten, W., cited, 35, 54, 82, 85, 86, 149, 436, 437, 438, 439 Paulmier, cited, 75 Peach, B. N., cited, 143, 314, 397, 434, 439 Pedipalpi, 141, 142 Penhallow, D. P., cited, 113, 436 Pennsylvania, 87, 88, 89, 90, 94, 95, 111 Peter Redpath Museum, acknowledgments to, 8 Phacops rana, 39 Phrynus, 66 Phyllocardia (Echinocaris), 311 Phylogeny of eurypterids, 124–35 Pitt, W. H., cited, 15, 91, 228, 349, 359, 362, 372, 434 Pittsford, 6, 105; section in old Erie canal, 102 Pittsford pool, 9 Pittsford shale, 20, 87, 91, 102, 106, 110, 161, 421 Pittsford-Shawangunk, 93 Plates, explanations of, 441–616 Platyonichus ocellatus, 51, 71, 75 oculosus, 72 Plectatnbonites sericeus, 325 Pocock, R. T., cited, 57, 142, 143, 388, 390, 394, 397, 398, 399, 438 Podolia, 95, 97 Poecilopoda, 147 Pohlman, Julius, cited, 16, 91, 108, 201, 202, 227, 349, 359, 360, 363, 379, 434, 435 Pores of doublures, 29 Portage beds, 18, 19, 89, 94 Portugal, 96 Portunidae, 75 Portunus, 75 Postabdomen, 68–71 Postoral appendages, 48 Potonié, cited, 111 Potosi limestone, 90 Potsdam rocks, 85 Proscorpionini, 388, 393 Proscorpius, 387, 394, 396, 398, 399 osborni, 143, 387–400 figures, 389 Prothelyphonus bohemicus, 142