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 Dolichopterus otisius, 88, 149, 261, 270–72, 275, 418, 419, 431 siluriceps, 89, 92, 149, 228, 259, 261, 273–74, 431 stylonuroides, 88, 149, 259, 261, 275, 276–78, 431 testudineus, 89, 92, 149, 261, 274–76, 431 See also Eurypterus Drepanopterus, 18, 35, 44, 48, 49, 70, 76, 80, 81, 83, 94, 129, 132, 133, 134, 151, 207, 212, 261, 281, 282, 286, 287, 288, 300, 314–16, 318 lobatus, 207 longicaudatus, 87, 91, 151, 287, 316–20 pentlandicus, 207 figure, 315

Eastman, С R., cited, 84 Echinocaris, 18, 311 wrightiana, 311 Echinognathus, 129, 130, 149, 321–22, 328, 329, 384 clevelandi, 16, 21, 86, 98, 149, 287, 300, 321, 322–24, 328, 408, 431 Ectognaths, 51 Eichwald, cited, 171 Embolobranchiata, 137 Emmelezoe, 20 Encrinurus punctatus, 99 Endostoma, 56 Eoscorpioidae, 393 Eoscorpius, 391 Equisetides wrightiana, 311 wrightianus, 18 Erettopterus, 69, 70, 76, 128, 129, 130, 350, 376, 377, 379, 384. 410, 419 See also Pterygotus Eria, 95 Erie county, 80, 92 Etheridge, R., jr, cited, 217, 221, 434 Eurypterella, 150 ornata, 17, 89, 93, 150 Eurypterida, history of investigations, 13–22; relationship with Limulus, 14, 18, 19, 135; morphology, anatomy and terminology, 23–71; diagram of, 24; mode of life, 71–85; geological distribution and bionomic relations, 85–113, 431; biologic facies, 90–94; ontogeny, 113–23; phylogeny, 124–35; taxonomic relations, 135–49; resemblance to scorpions, 141; relationship to Crustacea, 148; possible ancestors of the earliest vertebrates, 149; synoptic table, 149–52; systematic account, 152–410; suborder Limulava, 406, 407 Eurypteridae, 130, 149, 152 Eurypterus, 17, 18, 20, 21, 23, 29, 30, 31, 32, 33, 34, 35, 36, 40, 41, 42, 43, 44, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 65, 66, 67, 68, 69, 70, 76, 77, 78, 79, 80, 81, 90, 91, 94, 95, 100, 101, 105, 106, 113, 117, 119, 120, 124, 125, 126, 127, 128, 129, 132, 143, 149, 155–61, 181, 182, 183, 192, 198, 199, 200, 204, 207, 209, 212, 214, 215, 217, 219, 221, 222, 227, 232, 233, 239, 240, 259, 260, 261, 265, 272, 285, 286, 288, 299, 300, 316, 322, 329, 330, 331, 332, 333, 334, 339, 340, 349, 363, 366, 384, 401, 404, 405 figures, 58, 62, 403 sp., 87 acrocephalus, 230 approximatus, 18, 90, 94, 149, 155, 161, 195–96, 221, 222, 431 figure, 222 beecheri, 17, 310 (Tylopterus) boylei, 17, 87, 98, 150, 155, 158, 159, 161, 216, 218, 431 figure, 217 brewsteri, 158, 195 cestrotus, 288