SCIENTIFIC INDEX. 
angularis, 182, 180-184. 
var. intermedia, 183, 180, 184. 
basalis, 180. 
cribrosa, 184, 180-182, 185. 
dumosa, 181, 180, 182. 
exigua, see explanation to plate XIII. 
flabellata, 180. 
frondifera, 183, 151, 180, 184. 
interstincta, 180-182. 
proavia, 180. 
rigida, 180, 181, 182. 
undulata, 180. 
Stictoporide, 124. 
Stictotrypa, 106, 109, 162. 
Stigmaria, 2. 
Stomatopora, 115, 102, 107, 108, 116, 117, 119-121. 
dichotoma, 115. 
elongata, 117. 
inflata, 117, 115, 118, 119. 
proutana, 117, 109, 115, 116. 
tenuissima, 116, 117. 
turgida, 118, 116. 
Streblotrypa, 106, 110. 
Streblotrypide, 106. 
Streptelasma, $7, 88-90. 
breve, 92*. 
corniculum, 990, 87, 88, 93. 
crassa, 91, 90. 
expansa, 87. 
multilamellosa, 91, 90. 
parasiticum, 89*. 
parvula, 91, 90. 
profundum, 88, 87, 89, 90, 93, 255. 
rusticum, 93, 87. 
Streptelasmida, 87. 
Streptorhynchus americanus, 378. 
deflectum, 422. 
deltoidea, 403, 394. 
elongata, 390. 
filitexta, 385, 388. 
neglecta, 388. 
planumbona, 390. 
rectus, 422. 
subsuleatum, 398. 
subtenta, 389. 
Stricklandinia, 383. 
Stromatopora, 95. 
compacta, 80. 
Stromatotrypa, 301, 290, 302. 
ovata, 302, 321. 
Strophomena, 384,371, 389, 391, 398-400, 400,410,424. 
alternata, 405, 401, 402, 404. 
var. loxorhytis, 407. 
angulata, 405. 
anticostiensis, 405. 
billingsi, 8397*, 385, 395, 424. 
camerata, 403. 
cardinalis, 399, 385. 
convexd, 385, 387. 
deflecta, 422, 398. 
deltoidea, £03, 401. 
elongata, 390, 392. 
emaciata, 399, 385, 400. 
jilitexta, 385, 387, 388. 
fluctuosa, 395, 385, 392, 394, 396. 
Ixxili 
halli, 410. 
halliana, 385. 
hecuba, 385. 
incrassuta, 401, 403. 
incurvata, 385, 335*, 387-390, 392-394. 
inquassa, 403. 
kingi, £07. 
minnesotensis, 401. 
minor, 385. 
neglecta, 388, 385, 387, 393, 394, 
var. acuta, 388, 385, 389. 
nitens, 413, £10. 
nutans, 385, 392-394, 396, 397. 
planoconvexa, 385. 
planodorsata, 393, 385. 
planumbona, 390, 392. 
plicata, 393, 389. 
recta, £22, 397, 398, 424, 
rugosa, 390, 384, 385, 389-394, 386. 
var. subtenta, 393, 385, 389. 
scofieldi, 398, 385, 399, 400. 
septata, 390, 115, 385, 393. 
sericea, 414, 
sinuata, 399, 385. 
subtenta, 3889, 393, 
sulcata, 399, 385. 
thalia, 385. 
trentonensis, 389, 385, 390, 393, 394, 399, 400. 
trilobata, 395, 334, 385, 404. 
wnicostata, 411. 
vetusta, 389, 385. 
winchelli, 394, 393, 396. 
wisconsinensis, 389, 385, 393. 
Strophomenes rugosa, 390. 
Strophomenide, 384, 385. 
Strophonella deltoidea, 394, 403. 
Strotopora, 107, 110, 
Sub-Carboniferous, Bryozoa, 110; ferns, 6. 
Suessiina, 469. 
Sunflower coral, 59. 
Superficial aperture, 99. 
Synocladia, 106. 
Synopsis, American species of Ischadites, 65; 
American species of Receptaculites, 59. 
Syringopora, 84. 
Tabulex, 98. 
Treniodictya, 106, 110, 162. 
Teniopora, 106, 110. 
Tectulipora, 106, 110. 
Telotremata, 458. 
Terebinthinee, 5. 
Terebratellide, 472. 
Terebratula borealis, 380. 
lynx, 467, 
melonica, 472. 
Terebratulide, 471, 470, 472. 
Terebratulites biforatus, 454, 435. 
Terminology, Brachiopoda, 335; Bryozoa, 98. 
Tertiary, Bryozoa, 111; flora at base, 4; flora, 7. 
Testee pineiformis minuscule, 30 
Testce tuberose, 40. 
Tetracladina, 79. 
Tetractinellide, 73. 
