560 



BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Pleurosigrna quadratum, 133. 



rhombeum, 138. 



rigens, 138, 181. 



rigidum, 138. 



robustum, 136. 



simile, 138. 



speciosum, 139. 



strigosum, 139. 



subrigidum, 139. 



suluense, 139, 181. 



transversale, 135. 



virginicum, 133. 

 plicata, Amphiprora, 17. 

 plicatile, Stcgopoma, 195, 198, 204. 

 plicatilis, Calycella, 204. 



Lafoea, 204. 

 plicatula, Navicula, 115, 116, 180. 

 Plococidaris, 260. 



verticillata, 260. 

 Plumella, 197. 

 Plumularia, 226. 



aglaophenoides, 199, 222, 224, 241. 



asyinmetrica, 226. 



buskii, 199, 221. 



camarata, 199, 225, 241. 



catharina, 224. 



cylindrica, 228. 



dendritica, 199, 223, 224, 226. 



divaricata, 232. 



effusa, 229. 



flabellata, 199, 223, 241. 



hargitti, 199, 224, 241. 



hians, 237. 



macgillivrayi, 231. 



microscopica, 227. 



phoenicea, 233. 

 Plumularidae, 196, 197, 199, 200, 221. 

 Plumularinae, 197. 

 Podocystis, 140. 



adriatica, 140. 



americana, 140. 



australica, 140. 



spathulata, 140. 

 Podosira, 83. 



maculata, 85. 

 Polychaetous annelids, additions to, in- 

 cluding one new genus and three 

 new species, 183. 



four new species, 313. 

 polychroa, Cochlostyla (Cochlodrvas), 



410. 

 polygibbum, Plagiogramma, 129, 131. 

 polymorpha, Biddulphia, 58. 



Clavicula, 59. 

 Polymyxus, 14. 



coronalis, 14. 



schleinitzii, 14. 

 Polynoidae, 183. 

 polysticta, Navicula, 98. 

 polyzonata, Amphora, 26. 

 polyzonias, Sertularella, 216. 

 Porocidaris elegans, 250. 

 Porpeia, 140. 



quadriceps, 140. 

 porracea, Cochlostyla, 457. 



Cochlostyla dryas, 457. 



Cochlostyla virgata, 457. 



Helicostyla, 457. 



porracea, Helicostyla (Prochilus) virgata, 



457. 

 porraceus, Bulimus, 455, 458. 

 portuosum, Triceratium, 166. 

 powellii, Navicula, 100. 

 praetexta, Navicula, 116. 

 praetextus, Coscinodiscus, 69. 

 praevalida, Amphora, 19, 26. 

 pretiosus, Aulacodiscus, 31, 176. 

 princeps, Asterolampra, 29. 



Bacteriastrum varians, 57. 



Chaetoceros (Bacteriastrum), 57, 

 177. 

 Prionocidaris, 256. 



baculosa, 258. 



baculosa annulifera, 257, 259, 307. 



bispinosa, 258, 307. 



bispinosa chinensis, 259. 



glandulosa, 256. 



verticillata, 260. 

 prisma, Pleurosigrna, 137, 181. 

 prismatica, Amphora, 26. 

 prismaticum, Dimeregramma, 74, 178. 

 pristiophora, Navicula, 116. 

 pristis, Idia, 199, 207, 217. 

 probabilis, Navicula, 7, 116. 

 probata, Grammatophora, 79, 178. 

 Prochilus (subg.), 454. 

 Prochilus calobapta, 457. 



calobaptus, 456. 



dryas, 456. 



partuloides, 462. 



virgata, 456. 



virgatus, 456. 

 prodiga, Navicula, 116. 

 producta, Laetmonice, 183. 

 propeplanus, Hyalodiscus, 84, 178. 

 proteus, Amphora, 26, 27. 

 pruinosus, Actinocyclus, 13. 

 Pseudo-Amphiprora, 96. 

 Pseudo-Auliscus, 146. 

 pseudo-clavata, Navicula, 116, 180. 

 Pseudo-Eunotia, 140. 



doliolus, 140, 181. 

 pseudomarginata, Cocconeis, 64. 

 Pseudo-Stictodiscus, 168. 



angulatus, 168. 

 Pseudo-Synedra, 86. 

 Pseudotriceratium, 162. 

 Psilocidaris, 244, 282, 285. 



echinulata, 283, 284 (fig.), 308, 310, 

 311. 

 Ptychostylus cepoides, 431. 

 pudens, Navicula, 7, 117, 180. 

 puella, Navicula, 8, 117. 

 pugio, Navicula, 117. 

 pulchella, Acryptolaria, 199, 210. 



Biddulphia, 44, 80, 81. 



Cryptolaria, 210. 



Mastogloia, 91. 



Triceratium cornutum, 44. 

 pulchellum, Triceratium, 44. 

 pulcherrima, Cochlostyla (Calocochlea), 

 381 



Nitzschia, 8, 128. 



Synedra, 159, 182. 

 pulchra, Amphora, 26, 176. 



Rutilaria, 143. 



