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 Pterygotus quadraticaudatus, 16, 204, 358, 359, 360, 362, 363 figures, 361 raniceps, 228, 229, 331 Pterygotus-Slimonia group, 383, 409

Quebec, 94

Rathbun, Mary J., cited, 75 Raymond, Percy E., acknowledgments to, 8 Redenbaugh, W. A., cited, 438 Reed, Mark E., acknowledgments to, 8 Retsof salt shaft, 108 Rochester formation, 93 Roemer, Ferd., cited, 432, 433 Rondout waterlime, 89, 93, 101 Ruedemann, Rudolf, acknowledgments to, 7; mentioned, 6, 8, 10; cited, 438 Russia, 99

Salina formation, 9, 15, 20, 99, 100, 102, 103, 105, 106, 107–11, 420 Salt formation, 93 Salter, J. W., cited, 14, 36, 45, 55, 63, 75, 95, 156, 331, 348, 350, 379, 405, 432, 433 Sarle, C. J., cited, 44, 65, 91, 102, 157, 297, 300, 329, 330, 331, 332, 333, 334, 335, 340, 380, 381, 438; mentioned, 6, 9, 20 Sauquoit, 9 Scales, 25–29 Schenectady, 84 Schenectady basin, 10 Schenectady county, 86, 90 Schenectady formation, 10, 411, 420 Schmidt, Fr., cited, 14, 17, 19, 29, 31, 45, 46, 47, 48, 56, 60, 61, 62, 64, 95, 135, 156, 157, 158, 171, 230, 231, 262, 348, 352, 435, 436, 438 Schneider, Philip F., mentioned, 194 Schoharie county, 86, 90 Schuchert, C., cited, 88, 91, 100, 438 Scorpio, 61, 66, 140, 141, 143 Scorpionidae, 125, 140 Scorpions, 125, 127, 147; embryology, 143; figures, 144, 145; relations to Merostomes, 137 Scottish faunas, 18, 84, 94 Scudder, S. H., cited, 387, 390, 393, 394, 395, 396, 435 Seemann, Fr., cited, 95, 438 Selaginites, 357 Semper, M., cited, 95, 230, 437 Seneca county, 89 Serrations and spines, 30 Seward, A. C., cited, 400, 439 Shawangunk grit, 6, 8, 20, 87, 88, 91, 93, 102, 105, 113, 161, 255, 257; age, 419; in Pennsylvania, eurypterids from, 417–20 Shawangunk series, section of, 104 Sidneyia inexpectans, 406–7 Siluric waterlime, 16 Silurus, defined, 273 Simpson, cited, 111 Slimonia, 18, 20, 23, 31, 36, 42, 44, 47, 51, 54, 55, 56, 58, 61, 64, 65, 67, 70, 71, 76, 77, 94, 120, 126, 128, 129, 130, 157, 272, 300, 330, 334, 383, 408 acuminata, 61 figures, 64, 131 Smith, Charles, mentioned, 245 Smithsonian Institution, acknowledgments to, 7 South Africa, 95 South America, 95 Sphenophyllum thorni, 112 Sphenothallus, 99 Spines, 30 Spirifer, 100 vanuxemi, 194