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 Limulus, 23, 25, 26, 27, 29, 30, 33, 34, 35, 39, 42, 43, 44, 47. 48, 50, 51, 54, 56, 57, 60, 61, 62, 66, 70, 71, 76, 77, 79, 82, 85, 105, 113, 118, 119, 120, 121, 122, 123, 125, 127, 128, 135, 136, 137, 138, 139, 140, 141, 143, 144, 145, 146, 147, 149, 172, 173, 304, 305, 306, 308, 350, 366, 394, 398, 410; figures, 121; account of habits, 72; homology of lateral eye in, 36; longitudinal section, 33; relations of eurypterids to, 14, 18, 19, 135; transverse section through the head, 32 longispina, 57 polyphemus, 157, 377 figure, 43 walchi, 34 Lindström, G., cited, 136, 143, 397, 400, 435 Lingula, 99, 106, 111 Livingston county, 108 Livonia salt shaft, 108 Lloyd, W. A., cited, 72, 73 Lockport limestone, 87, 421 Lockport-Noblesville formation, 93 Lockwood, Rev. S., cited, 72 Logan, Sir William, cited, 85, 350, 356, 433 Lucina (Ilionia) prisca, 100 Ludlow beds of Scotland, 16 Luther, D. D., mentioned, 9, 10, 108 Lyell, cited, 107

McCoy, F., cited, 95, 432, 437 McMurrich, J. P., cited, 61 Macrochirus kämpferi, 45 Macrura, 410 Madison county, 89 Manlius limestone, 19, 89, 93, 101, 161 Mansfield, J. F., cited, 434 Martin, D. S., mentioned, 16; cited 434 Martin, J. C., mentioned, 417 Maryland, 87, 88 Matthew, G. F., cited 17, 436 Matuta, 75 Medina-Richmond shales, 93 Meek, cited, 17, 219, 222, 223, 225, 433 Megalograptus, 130, 151, 324, 384 welchi, 21, 87, 98, 151, 324, 325–29, 431 Meristina didyma, 100 Merostomata, 82, 136, 137, 138, 147, 148, 149, 152, 348, 385, 386, 407 Mesonacidae, 128 Mesonacis, 128 Metastoma, 56, 68–71 Metschnikoff, cited, 143, 144 Miller, Hugh, cited, 107 Missouri, 85 Mitchill, S. L., cited, 13, 432 Mohawk valley, 6, 99 Monroe county, 6, 20, 87 Monroe limestone, 89 Montana, 85, 98 Morganville, 32 Morphology, 23 Museum of Comparative Zoology, acknowledgments to, 8

Neolimulus, 112 New Brunswick, 89, 93, 94, 95 Newberry, J. S., mentioned, 273 Newlin, mentioned, 245 Niagaran, 103 Nicholson, H. A., cited, 436 Nieszkowski, J. cited, 14, 17, 19, 26, 31, 135, 155, 156, 432 Normanskill beds, 420; eurypterids from, 411–17 Nova Scotia, 87, 95

Ochsenius, cited, 107 Odontocephalus, 291 Oesel beds, 95, 97, 99, 100, 102 Ohio, 87, 89