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 Spirorbis, 111 Strabops, 31, 35, 68, 69, 86, 119, 120, 122, 123, 124, 125, 126, 127, 128, 129, 130, 140, 148, 151, 152, 186, 322, 410 thacheri, 19, 85, 98, 124, 151, '152–55, 431 figure, 153 Strabops stage, 123, 124 Strauss-Durkheim, cited, 136 Streptelasma rusticum, 325 Stylonurus (Ctenopterus) 18, 20, 21, 23, 30, 31, 33, 34, 35, 43, 44, 48, 49, 50, 51, 58, 59, 65, 69, 70, 76, 80, 81, 83, 84, 88, 90, 94, 110, 113, 116, 120, 126, 128, 129, 130, 132, 133, 134, 151, 212, 230, 259, 260, 261, 262, 278–88, 286, 297, 300, 312, 316, 318, 321, 322, 329, 384 sp., 18, 88, 151, 312–14, 419 beecheri, 89, 94, 151, 288, 292, 310–11, 431 figure, 310 bembycoides, 288 cestrotus, 33, 49, 88, 151, 279, 280, 282, 284, 285, 286, 287, 288–91, 292, 294, 297, 312, 314, 431 elegans, 50, 279, 280, 282, 285, 286, 287 figure, 280 ensiformis, 288 excelsior, 16, 17, 19, 43, 81, 89, 94, 95, 113, 134, 151, 278, 279, 282, 284, 285, 286, 287, 288, 291, 292–95, 306, 313, 378, 408, 431 figures, 293, 294 lacoanus, 19, 292 limbatus, 22, 86, 151, 288, 295–97, 431 lobatus, 288 logani, 50, 278, 279, 282, 284, 285, 286, 287, 292 figure, 281 Stylonurus longicaudatus, 288, 431 macrophthalmus, 278, 279, 280, 282, 285, 286, 287, 318 figure, 283 megalops, 288, 295, 302 modestus, 415, 431 figure, 415 multispinosus, 20, 87, 151, 286, 287, 297–300, 431 myops, 34, 88, 116, 117, 118, 119, 123, 136, 151, 260, 288, 295, 296, 300–9, 312, 313, 418, 419, 431 ornatus, 282, 286, 287 pentlandicus, 288 powriei, 278, 279, 280, 287, 292, 302 figure, 348 scabrosus, 287 scoticus, 50, 70, 279, 285, 287, 295, 302, 303, 3l3 simonsoni, 230 symondsi, 278, 288 wrightiana, 311 wrightianus, 89, 94, 311–12, 431 figures, 312 Swimming feet, 71 Swimming legs, 51

Table of Eurypterida, 149–52 Tail, 68–71 Tarsopterus, 287 Taxonomic relations of eurypterids, 135–49 Terminology, 23 Thelypbonidae, 125 Thelyphonus, 61, 62, 66, 141, 142 Thorell, T., cited, 136, 138, 143, 388, 390, 391, 393, 394, 397, 400, 435 Triartbrus becki, 11 Trilobites, 147, 148 Twenhofel, W. H., cited, 439