SCIENTIFIC INDEX. eliii 
i Turbinids, 980, 939, 1043. 
oe eae Turbinites centrifugus, 1028. 
lambi, 7938, 812. Turbo striatum, 1058, 
oweni, 792, 793, 812. Turritella, 1021. 
planoconvexum, 791, 793, 812. Turritellide, 947, 1021. 
planodorsatum, 792, 793, 812. Turritoma, 959. 
sp. ?, 793, 812. Turritospira, 1013. 
Trochide, 930, 939, 1048, 1047. Ulrichia, 632, 650, 664, 667. 
Trochonema, 1045, 815, 939, 962, 989-991, 1043- marrii, 664. 
1047, 1052, 1053. nicholsoni, 664, 
altum, 1052. umbonata, 659. 
arctatum, 1054, 1047. Umbilicus of Gastropoda, 815. 
beachi, 1048, 1047. Umbones, 478. 
bellulum, 1050, 962, 989, 990, 1047, 1051. Unionide, 486. 
beloitense, 1048, 989, 1049. Univalvia, 817. 
eccentricum, 1049, 1050, 1051. 
fragile, 1050, 1051. 
madisonense, 1051, 1047, 1050. Vaginoceras, 765, 778. 
niota, 1052, 1047, Vanuxemia, 549, 486, 490, 534-536, 538, 539, 542— 
nitidum, 1053. 544, 550, 557, 560, 561, 563. 
obsoletum, 1064, 1047. abrupta, 560, 498, 558. 
pulchellum, 1045, 1046. cardinata, 559. 
retrorsum, 1051, 962, 989, 1047, 1050. crassa, 553, 551. 
robbinsi, 1053, 1047, 1054. decipiens, 562, 539, 544. 
Tugosum, 1049. dixonensis, 550, 551, 552, 554. 
salteri, 1053. var. insueta, 551. 
simile, 1047. gibbosa, 559, 561. 
subcrassum, 1051, 1050. hayniana, 657, 479*, 549, 558, 555-562. 
umbilicatum, 1047, 1045-1050. inconstans, 550, 551, 554, 555, 
var. canadense, 14348, 1050. media, 553 
latum, 1048. nana, 558-560. 
Trochonematide, 1043, 1044. niota, 560, 555, 561. 
Trochonemopsis, 1046, 1045. ; obtusifrons, 554. 551, 555, 556. 
tricarinata, 1046. rotundata, 552, 551-554. 
Trochus, 939, 930, 1043, 1047. sardesoni, 555. 
astraliformis, 939. suberecta, 553, 551, 552. 
cavus, 939. subrotunda, 559, 558. 
dalli, 939, 1047. terminalis, 556, 534, 557, 560. 
fulminatus, 939, 1047. umbonata, 556, 555. 
gothlandicus, 939. wortheni, 561. 
incisus, 939. Vertumia, 48%. 
lamellosus, 939, 1047. 
lundgreni, 939, 1047. 
mollis, 939, 1047. 
profundus, 939. 
stuxbergi, 939, 1047. 
wisbyensis, 939, 1047. 
Tropidiscus, 858. i 
Tropidodiscus, 852, 912. 
Tryblidium, 824, 820, 822, 825-828. 
acutum, 826. 
canadense, 828, 825, 829, 
conicum, 840, 825, 826, 838, 841, 
erato, 826. 
exsertum, 842. 
indianense, 834. 
modestum, 826 
Ovale, 825. 
Ovatum, 825. 
piliolum, 829, 826, 834. 
radiatum, 827, 824. 
reticulatum, 824. 
unguis, 821, 820*, 824, 825. 
valida, 832. 
Waagenia, 914, 
Waageniella, 914, 915. 
Warthia, $35, 856, 867, 868, 915. 
brevisinuata, 856. 
lata, 856 
polita, 855. 
Whiteavesia, 628. 
Whitella, 564, 478, 479, 483, 486, 535, 539, 565-567 
573-577. 
carinata, 568. 
compressa, 568, 570, 572. 
concentrica, 569, 570, 573. 
hindi, 535, 565, 568. 
megambona, 670, 535, 572. 
obliqua, 565, 568, 569, 574. 
ohioensis, 568, 570. 
plebeia, 535, 565. 
precipta, 574, 569. 
quadrangularis, 666, 535. 
rugatina, 569, 573. 
scofieldi, 571, 569-573. 
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