558 



BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Obba planulata varaderoana, 361, 363, 

 365. 



planulata verdensis, 361, 362, 370. 



sarcochroa, 343. 



sarcochroa ilogana, 355. 



sarcochroa sarcochroa, 356. 



subhorizontalis, 343, 355. 



subhorizontalis radeliffei, 355. 



subhorizontalis subhorizontalis, 355. 

 Obbina listen minor, 348. 



listen recurvata, 351. 



listen recurvata subscalaris, 351, 

 353. 



planulata, 33S. 



planulata marmorata, 339. 

 Obelia serrulata, 202. 



thornelyi, 198, 202. 

 obesa, Amphora, 25. 



Navicula, 62, 111, 179, 180. 



Nitzschia, 127. 



Stauroneis, 62, 111. 

 obesum, Plagiogramraa, 130. 



Pleurosigma, 131, 136, 181. 

 oblonga, Tropidoneis, 174. 

 oblongistriata, Surirella ceylanensis, 151. 

 obnubila, Cochlostyla (Chrysallis) nigri- 



ceps, 528, 530. 

 obscura, Mastogloia, 91. 

 obscurus, Actinocyclus, 13. 

 obtusa, Amphora, 22, 25. 

 obtusum, Pleurosigma, 136, 137, 181. 

 oceanica, Amphora obtusa, 25. 



Endictya, 76, 77. 



Grammatophora, 79. 

 oceanicum, Rhoicosigma, 143. 

 ocellata, Amphora, 25. 



Cocconeis, 63, 178. 



Navicula, 112, 180. 



Nitzschia, 17. 

 oculiformis, Mastogloia, 90. 

 oculus, Amphora, 25. 

 oculus-cati, Cocconeis, 63. 

 oculus-iridis, Coscinodiscus, 65, 69. 

 Odontella, 81. 

 Okedenia, 148. 



scopulorum, 148. 

 omphalanthus, Coscinodiscus, 65. 

 Omphalopsis, 129. 



australis, 129. 

 Onuphis branchiata, 313, 317, 318 (fig.). 



(Nothria) willemoesii, 319. 

 Ophiacantha sp., 270. 

 ophiocephala, Navicula, 112. 

 Opisthoporus, 323, 324 (fig.). 



biciliatus, 323, 327. 



quadrasi, 323-325. 



quadrasi busuangensis, 325. 



quadrasi palawanensis, 323, 326, 

 327. 



quadrasi quadrasi, 324, 325, 327. 



quadrasi subsp., 327. 



quadrasi turturinganus, 325, 326. 

 opulens, Dimeregramma, 74, 178. 

 orbicularis, Campylodiscus, 52. 

 orbitula, Bulimus, 418. 



Cochlostyla, 418, 419. 



Cochlostyla (Cochlodryas), 418. 



Helicostyla, 418, 419. 



orbitula, Helix, 418. 

 orbitulus, Cochlostyla, 419. 



Helicostylus, 418. 



Helix (Cochlostyla), 418. 

 oregonus, Aulacodiscus, 31. 

 orientalis, Aulacodiscus, 31. 



Surirella, 156, 182. 

 ornatus, Campylodiscus, 48, 53. 

 orotis, Helicostyla (Chrysallis) min- 



doroensis, 486. 

 Orthoneis, 87, 92. 

 Orthosira, 76. 



aspera, 90. 

 Orthostyla monozonus, 333. 



rufogaster, 334, 335. 

 Orthostylus (subg.), 434. 

 Orthostylus, 377, 378. 



floridus, 411. 



monozona, 333. 



rufogaster, 334. 

 Orthotropis, 173. 

 osborni, Cochlostyla (Chrysallis) rollei, 



488, 489. 

 oscitans, Navicula, 112. 

 os-pristis, Cocconeis, 63, 178. 

 ostrea, Auricula, 33. 

 Oswaldella, 197. 

 o'swaldii, Amphiprora, 17, 176. 



Navicula, 113. 

 ovalis, Amphora, 25. 

 ovata, Licmophora, 86. 



Mastogloia, 90, 179. 

 ovulum, Navicula, 107. 

 ovum-paschale, Mastogloia, 90. 

 Pachya dolium, 431. 

 pacifica, Antennopsis, 199, 228, 241. 



Navicula, 113. 



Surirella, 157. 

 pagbilaoensis, Obba gallinula, 344. 

 palawanensis, Opisthoporus quadrasi, 



323, 326, 327. 

 palliobasis, Cochlostyla (Chrysallis), 



486. 

 Palmeria, 80. 



paluana, Obba planulata, 361, 365. 

 paludosa, Amphiprora, 17. 

 pan, Bulimus, 462. 



Helix, 462. 

 pandura, Navicula, 97, 99, 105, 113. 

 panduriformis, Nitzschia, 125, 127. 

 papilio, Plagiogramraa, 130. 

 papilionacea, Helix, 361. 

 papillata, Biddulphia, 43. 

 parallaxis, Helicostyla (Chrysallis) min- 



doroensis, 517, 518. 

 parallela, Navicula, 115, 116. 

 parallelus, Stictodiscus, 150. 

 pardus, Trigonium, 170. 

 partistriata, Scoliopleura, 144, 181. 

 partita, Navicula, 113, 180. 

 partitum, Triceratium, 42. 

 Partula labrella, 455, 459. 

 partuloides, Bulimus, 462. 



Bulimus (Amphidromus), 462. 



Bulinus, 462. 



Cochlostyla, 462. 



Cochlostyla (Prochilus), 462. 



Helicostyla (Prochilus), 462. 



