lxxii THE PALEONTOLOGY OF MINNESOTA. 
Rosalina asterites, 45. 
maorica, 44. 
marginata, £2. 
orbiculus, 44. 
weinkaupfii, 44. 
Rosiflore, 5, 
Rotalia ammonoides, 44. 
aspera, 41, 
canariensis, 45, 
capitata, 44. 
centralis. 41. 
densa, 41. 
globulosa, 41. 
laxa, 41. 
leptospira, 40. 
marginata, £2. 
pachyomphala, 41. 
paupercula, 45. 
perforata, 41. 
pertusa, 41. 
protacmoa, 41, 
quaterna, 41. 
rosa, 41. 
rudis, 40. 
senaria, 40. 
tracheotetras, 41. 
Rotalina cultrata, 45. 
inflata, 28. 
spinimargo, 45. 
Rotalin, 44. 
Saganella, 120. 
Salix, 8, 5,°15. 
proteifolia, 9, 21, 22. 
Sapindus, 8, 5. 
morrisoni, 19, 9, 22. 
Sassafras, 7, 5. 
Scalaripora, 106, 110. 
Scaphites nodosus var. quadrangularis, 53, 
Scenellopora, 107, 109, 121. 
Scenidium, 381, 377, 382. 
anthonensis, 381, 333, 473. 
halla, 381, 
Sceptropora, 106, 189, 191. 
Schizambon, 360, 359-362. 
dodgii, 361, 360, 362. 
fissus var. canadensis, 362, 359, 361. 
lockii, 362, 360. 
typicalis, 360, 361. 
Schizambonia, 360. 
Schizocrania, 369, 361, 371. 
filosa, 370, 371*. 
Schizotreta, 365, 364. 
conica, 265, 366. 
minutula, 366*. 
ovalis, 366. 
pelopea, 365, 334, 366. 
Selaginella, 3. 
Selenoides, 61. 
dowensis, 64. 
Selenopora, 107, 110. 
Semicoscinium, 106, 110, 212, 214. 
Senonian, lower, 4. 
Septa, 98. 
Septopora, 106, 110, 111. 
Sequoia brevifolia, 10. 
species, 22. 
winchelli, 10, 9, 22. 
Shale, preparation, 26. 
Sigillaria, 6, 2. 
Silurian, Brachiopoda of Lower, 332-474; Bryozoa 
of Lower, 96-332; Bryozoa of Upper, 109; Sponges, 
graptolites and corals of Lower, 55-95; land 
vegetation in middle, 1. 
Siphonotreta, 358, 359. 
minnesotensis, 358, 359, 362. 
scotica, 359. 
unguiculata, 358. 
Siphonotretide, 358, 363. 
Skenidium, 881. 
anthonensis, 381. 
halli, 381. 
Solenopora, 80. 
compacta, SO. 
spongoides, 80. 
Spatangus spines, 52. 
Spatiopora, 319, 102, 107, 321. 
areolata, 320. 
aspera, 319. 
iowensis, 321. 
labeculosa, 320, 321. 
lineata, 320. 
maculosa, 321, 320. 
var. incepta, 320. 
Spherospongia, 56, 64, 72; Tessellata, 58. 
Spheerulee hispide, 35, 
Sphenophyllum, 2. 
Sphragiopora, 106, 110, 111. 
Sphragioporide, 106. 
Spiniform, corallites, 98; tubuli, 98. 
Spirifer, 337, 454, 469. 
biforatus var. lynx 455. 
inequivalvis, 459. 
lynx, 457. 
sheppardi, 455, 457. 
Spiriferid, 469, 465, 470. 
Spiroplecta, 31, 28. 
americana, 31, 52. 
Spiropora, 123. 
regularis, 123. 
Sponge spicules, 52. 
Sponges, chapter on Lower Silurian, 55-95, 
Sporangites huronensis, 24. 
Stellipora, 107, 109, 290, 377. 
Stenocisma, 465. 
Stenopora, 107, 98, 111. 
Sterculia, 5. 
Stictopora, 106, 724, 128, 176. 
acuta, 155, 
basalis, 128. 
fidelis, 134, 135. 
labyrinthica, 144, 145. 
magna, 174, 
multifida, 174. 
mutabilis, 125, 
var. minor, 125, 127. 
paupera, 129, 130. 
shafferi, 176. 
Stictoporella, 179, 106, 110, 162, 163, 180, 185. 
