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 Protichnites, 85 Protolimulus eriensis, 140 figure, 140 Pseudoniscus, 20, 112 Pteraspis, 84, 357 (Palaeaspis) americana, 97 Pterichthys, 82 Pterinea, 99 subplana, 99 Pterygotidae, 129, 151, 329; fragments, figures, 417 Pterygotus, 14, 15, 17, 18, 20, 21, 23, 26, 27, 29, 31, 35, 36, 44, 50, 51, 55, 58, 59, 60, 61, 63, 64, 65, 67, 69, 70, 71, 76, 77, 82, 83, 88, 90, 91, 93, 95, 113, 114, 116, 117, 120, 124, 125, 126, 127, 128, 129, 130, 135, 142, 151, 157, 173, 202, 204, 233, 234, 243, 260, 261, 265, 272, 275, 284, 300, 314, 321, 329, 330, 331, 332, 333, 334, 339, 348–50, 357, 359, 366, 372, 374, 375, 376, 377, 379, 381, 383, 384, 401, 406, 419, 429; homology of lateral eye in, 36; morphology and formation of the chelicerae, 44; disjecta membra from the Frankfort shale, 383 sp., 89, 356, 358, 380 acuticaudatus, 16, 358, 359, 360, 362 anglicus, 46, 61, 63, 71, 95, 127, 204, 333, 348, 352, 356, 358, 364, 370, 372, 373, 383 figure, 348 atlanticus, 89, 151, 350, 356–58, 431 (Erettopterus) banksii, 330, 331, 376, 379, 381 barrandei, 373 figure, 373 (Erettopterus) bilobus, 16, 36, 46, 61, 63, 331, 333, 348, 350, 358, 360, 362, 364, 373, 376, 380 figure, 361 Pterygotus bohemicus, 373 buflaloensis, 16, 29, 30, 36, 38, 44, 46, 56, 89, 92, 117, 118, 151, 202, 204, 233, 241, 349, 353, 354, 358–71, 372, 373, 429, 430, 431 figures, 360, 366 chelicera, 385 cobbi, 15, 89, 92, 151, 349, 353, 359, 362, 364, 370, 371–74, 380, 381, 431 var. juvenis, 429–30, 431 figures, 429, 430 cummingsi, 15, 358, 359, 362, 371, 372 figure, 360 globicaudatus, 16, 201, 202, 204, 205, 359 figures, 202, 203 (Erettopterus) globiceps, 88, 115, 117, 123, 151, 349, 350, 374–78, 418, 419, 431 grandis, 89, 92, 151, 349, 350, 379–80, 431 ludensis, 113 macrocephalus, 359 macrophthalmus, 15, 36, 44, 46, 56, 89, 92, 114, 115, 117, 152, 333, 349, 350–56, 358, 362, 363, 364, 370, 371, 372, 373, 376, 380, 381, 429, 430, 431 minor, 406 monroensis, 20, 87, 152, 349, 380–81, 431 (Eusarcus) nasutus, 22, 86, 152, 349, 382, 412, 414, 416, 431 figures, 416 normanskillensis, 416–17, 431 figure, 416 osborni, 15, 331, 349, 350, 353, 354, 355, 359 osiliensis, 17, 46, 63, 64, 262, 333, 348, 352, 353, 356, 364, 366 otisius, 270 prolificus, 22, 86, 152, 349, 382–83, 384, 431