SCIENTIFIC INDEX. lxix 
sociale, 321. 
Orthopora, 309. 
Orthothetes, 413. 
Ostracoda, 122 186. 
Ostrea congesta, 53. 
Other Cretaceous fossils from Minn., 21. 
Otodus appendiculatus, 53. 
Ovicell, 98. 
Pachydictya, 145, 98, 106, 109, 141, 147, 148,155, 160. 
acuta, 155, 128, 146, 152, 153, 158, 159. 
alcyone, 146. 
arguta, 146. 
bifurcata, 147. 
conciliatriz, 160. 
crassa, 146. 
elegans, 164, 153, 155, 157. 
emaciata, 147. 
everetti, 146. 
farctus, 147. 
fenestelliformis, 152, 146. 
fimbriata, 152, 146, 155, 157. 
firma, 141, 146. 
foliata, 149, 146, 184, 303. 
frondosa, 103. 
gigantea, 156. 
hexagonalis, 146. 
magnipora, 146. 
obesa, 146. 
occidentalis, 151, 152, 146, 155, 157. 
pumila, 157, 146, 158, 159, 301. 
var. sublata, 158. 
robusta, 146. 
rudis, 147. 
rustica, 146. 
scitula, 147. 
splendens, 141, 146. 
triserialis, 159, 146, 160 
turgida, 146. 
Paleschara, 105, 109. 
Palescharide, 105. 
Palinurus, 5. 
Pasceolus, 68. 
dactylioides, 67. 
Paterina, 344, 361. 
Pedicle (ventral) valve, 335. 
Penniretepora, 106. 
Pentameride, 382, 337. 
Pentamerus, 378. 
galeatus, 378 
hemiplicatus, 382. 
Perforated diaphragms, 98. 
Permian, flora, 6, 2; limestone, 3. 
Peronopora, 106 216, 217, 222, 222, 228. 
Persea, 5. 
Petalotrypa, 107, 110. 
Petigopora, 107, 319. 
Petraia rustica, 93. 
Phacelopora, 105. 
Phaceloporid, 105. 
Pheenopora, 173, 106, 109, 145, 162, 163, 172. 176. 
bipunctata, 174. 
constellaria, 174. 
ensiformis, 174, 173. 
excellens, 174. 
expansa, 173, 166. 
explanata, 173, 174. 
fim briata, 174. 
incipiens, 174, 162, 172, 173. 
lindstreemi, 174. 
lonsdalei, 174, 173. 
magna, 174. 
multitidia, 174. 
multipora, 139, 140. 
punctata, 174. 
superba, 174. 
tenuis, 174. 
wilmingtonensis, 175, 172, 174. 
Phanerostomum atlanticum, 40. 
Pharetrones, 77. 
Pholidops, 376. 
trentonensis, 376. 
var. minor, 376, 377, 467. 
Phylactolemata, 105. 
Phyllites vanonex, 22. 
Phyllodictya, 141, 106, 142, 143, 147, 148. 
frondosa, 142, 141, 143, 184. 
varia, 144, 138, 140, 142-145. 
Phyllopora, 106, 208, 209. 
corticosa, 212. 
Phylloporina, 208, 103, 106, 207, 209, 213, 214. 
aspera, 208. 
asperato-striata, 208. 
beds, 129. 
clathrata, 211. 
corticosa, 212, 157, 159, 207, 214, 227, 264, 284. 
dawsoni, 208. 
granistriata, 210. 
halli, 207, 211. 
reticulata, 210, 208, 211. 
sublaxa, 209, 207. 
trentonensis, 208, 207, 210. 
Phylloporinide, 207, 99, 106, 109, 208. 
Pinacotrypa, 107, 110, 302. 
Pinnatopora, 106, 103, 110. 
Pinus hayesiana, 10. 
quenstedi, 22. 
species, 10, 9, 22. 
Placenticeras placenta, 52. 
Plesiomys, 420, 421. 
deflecta, 422. 
recta, 422. 
subquadrata, 429. 
Planorbulina ammonoides, 44. 
Plants, fossil, from Minn., 1-22. 
Planulina globigerina, 40. 
incurvata, 45. 
mauryanda, 40, 
megalopentas, 40. 
membranacea, 45. 
pachyderma, 41. 
pertusa, 40. 
porotetras, 40. 
repanda var. menardi, 45. 
subvar. pauperata, 45. 
stigma, 40. 
Platanus, 8, 5, 14. 
heeri, 14. 
primeva, 14, 9, 21, 22. 
