Heterodictya, 163. 
gigantea, 166. 
Heterospongia, 78. 
subramosa, 79, 78. 
Heterotrypa, 267, 107, 269, 270, 273, 313. 
frondosa, 267, 103, 268. 
mammulata, 267. 
prolifica, 268. 
singularis, 268. 
ulvichi, 270. 
vaupeli, 313. 
Heterotrypidx, 267, 107, 109, 269, 274, 289. 
Hexactinellide, 55. 
Hindia, 79, 80 
inequalis, 80. 
parva, 79, 80. 
spheroidalis, 80. 
Hippothoa, 117. 
inflata, 117. 
Holobranchia, 105, 104. 
Homotrypa, 235, 106, 186, 214-216, 221, 
240, 265, 266, 272. 
collosa, 243, 222. 
curvata, 235, 244. 
exilis, 236, 216, 237, 239. 
flabellata, 103. 
insignis, 239, 240. 
intercalaris, 238*, 216, 235, 241. 
minnesotensis, 235, 215, 216, 237. 
var. montifera, 236. 
obliqua, 241, 243. 
separata, 237, 216, 235. 
similis, 242, 265, 301, 312. 
subramosa, 239, 216, 240. 
var. insignis, 240. 
tuberculata, 240*, 227, 284. 
Homotrypella, 228, 106, 215, 229, 235. 
gracilis, 233, 231. 
granulifera, 234, 233. 
instabilis, 229, 228, 230, 231, 234. 
intercalaris, 232. 
multiporata, 230, 234. 
. mundula, 232%, 234. 
ovata, 231, 215, 216, 239, 241. 
rustica, 234. 
similis, 215. 
subgracilis, 230. 
Hyalostelia smithii, 55, 72. 
Hydroida, 80. 
Hydrozoa, 81, 80. 
Hyolithes, 317. 
baconi, 317. 
Hypoxylezx, 3. 
Icthyorachis, 106, 110. 
Idiotrypa, 107, 290. 
Tlex, 5. 
TInoceramus, 53. 
erispii var, barabini, 53. 
Intrapora, 106, 110, 162. 
Intricaria, 208. 
clathrata, 211. 
reticulata, 210. 
Iron ores, Cretaceous, 54. 
SCIENTIFIC INDEX. 
bursiformis, 61. 
canadensis, 66. 
circularis, 65. 
cyathiformis, 65. 
hemisphericus, 66. 
iowensis, 64, 57, 65. 
jonesi, 65, 
koenigii, 64-66, 
squamifer, 66. 
subturbinatus, 66. 
synopsis of American species, 65. 
tessellatus, 66. 
Tsotrypa, 106, 110. 
Juglans, 8, 5, 19. 
debeyana, 19, 9. 
latifolia, 19. 
Jurassic, Bryozoa, 111, 121; flora, 3, 2. 
229, 998 
ety GOO, 
Kampylopegmata, 471, 473. 
Keuper, Calamariez, 2. 
Klitambonites, 377. 
Knorria, 2. 
Lagena, 35, 28. 
aspera, 36, 52. 
fayosa-punctata, 36, 52. 
hispida, 35, 52. 
jeffreysti, 35. 
parkeriana, 35. 
Lagenide, 35. 
Lageninw, 35. 
Laramie group, flora, 4. 
Lauracee, 5, 
Laurinex, 7. 
Laurophyllum reticulatum, 22. 
Laurus, 8, 5. 
nebrascensis, 15, 9, 22. 
plutonia, 14, 9, 15, 21, 22. 
proteifolia, 15. 
species, 22. 
Lead fossil, 59. 
Leguminosex, 5. 
Leguminosites, 21. 
species, 22, 9. 
Leioclema, 107, 98, 110, 111, 308, 313. 
Lenticulites complana, 46, 45. 
planulata, 46. 
Leperditia fabulites, 473. 
Lepidodendron, 6, 2. 
Lepidolites, 67, 57. 
dickhauti, 67. 
elongatus, 67. 
Lepidophloios, 2. 
Leptena, £09, 400, 410, 411, 413, 428. 
alternata, 404, 400, 405. 
aspera, 414, 415. 
camerata, 403, 404. 
charlottxz, 410, 411. 
deltoidea, 401, 394, 395, 403. 
incrassata, 401, 402, 410. 
minnesotensis, 414. 
Ischadites, 61, 57, 63-65, 67, 67, 72, 74. 
lxv 
