546 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Crepidula, 291. 

 cruciata, Mastogloia, 88. 

 crucifix, Navicula, 119. 

 Cryptolaria pulchella, 210. 

 crystallina, Synedra, 159. 

 cucumeris, Amphora, 20, 176. 

 culcitella, Biddulphia, 37. 

 Cuming, Hugh, 374. 

 cuneata, Sceptroneis, 144, 159, 181. 



Surirella, 153. 



Synedra, 159. 

 cuneatella, Surirella, 153, 181. 

 cuneiformis, Hemidiscus, 80. 

 cupressina, Aglaophenia, 231. 

 curvatulus, Actinocycius, 12. 

 curvifacies, Surirella, 154. 

 curvirotunda, Cocconeis, 62. 

 curvisetum, Chaetoceros, 56. 

 curvitheca, Zygophylax, 196, 199, 212, 



241. 

 cuspidata, Biddulphia, 37. 



Navicula, 89, 99, 147. 

 cuticulare, Cochlostyla roissyana, 389. 

 cuticularis, Helicostyla (Calocochlea) 



roissyana, 389. 

 cuyoensis, Bulimus, 456. 



Cochlostyla (Prochilus), 455, 464, 

 465. 

 cyclamen, Triceratium, 34. 



Trigonium, 161. 

 cycloides, Biddulphia, 37, 177. 

 cyclophora, Cocconeis, 62. 

 cyclops, Navicula, 99, 179. 

 Cyclophoridae, 323. 

 Cyclotella, 71. 



crassilineata, 71, 178. 



striata, 71. 

 cylindrica, Nemertesia, 199, 227. 



Plumularia, 228. 

 Cymatogonia, 14. 

 Cymatoneis, 10, 59, 71. 



circumvallata, 71. 



definita, 72, 178. 



lacunata, 72, 178. 



sufflata, 72, 178. 



sulcata, 8, 71, 73, 122. 

 Cymatopleura, 9. 

 Cymbella, 73. 



ehrenbergii, 73. 



gastroides, 73. 

 cymbelloides, Amphora, 18. 

 cymbifera, Amphora, 20, 21. 

 Cyrtocidaris (subg.), 264, 283, 285. 

 Cystopleura, 9. 



daemelianus, Campylodiscus, 50. 

 daemon, Syringidium, 160. 

 danica, Achnanthes, 12. 

 danicum, Achnanthidium, 12. 

 davyana, Entogonia, 166. 

 debyi, Licmophora, 86, 178. 

 decora, Cochlostyla, 430. 



Cochlostyla (Cochlodryas), 430. 



Helicostyla, 430. 



Helix, 430. 

 decorum, Pleurosigma, 134, 139. 

 decorus, Acavus (Tachea), 430. 



Campylodiscus, 50, 54. 



decussatus, Actinocycius, 12, 176. 



definita, Cymatoneis, 72, 178. 



deflexa, Surirella, 154, 156. 



delecta, Navicula, 100, 180. 



delicatula, Auliscus caelatus, 32. 



delphinia, Amphora, 22. 



demesai, Cochlostyla (Chrysallis) cani- 



ceps, 520, 523. 

 demesana, Cochlostyla (Hypselostyla) 

 cincinniformis, 436, 438. 



Cochlostyla (Hypselostylus) cin- 

 niformis, 438. 



Helicostyla cincinniformis, 438. 

 denarius, Coscinodiscus, 71. 

 dendritica, Plumularia, 199, 223, 224, 



226. 

 densestriata, Navicula forcipata, 102. 

 densistriata, Navicula forcipata, 8. 

 dentatus, Campylodiscus, 51. 

 Denticella, 39. 



lauta, 16. 



marina, 73. 



staurophora, 130. 

 denticulatus, Coscinodiscus, 66. 

 Dentitheca, 197. 

 Desmoscyphus, 196. 



longitheca, 218. 

 devius, Coscinodiscus, 69. 

 diadema, Chaetoceros, 56, 159. 



Syndendrium, 159. 



Syringidium, 56. 

 diaphanum, Trigonium, 163, 169, 182. 

 Diatoms, marine, 1. 

 dichotoma, Amphora, 21, 176. 

 Dictyocladium, 215. 



aberrans, 195, 199, 214, 241. 

 Dictyoneis thumii, 108. 

 diducta, Amphora, 21. 

 didyma, Navicula, 101. 

 diffusa, Navicula, 8, 101. 

 digitalis, Diphasia, 199, 218. 



Sertularia, 218. 

 digito-radiata, Navicula, 111. 

 dimera, Cochlostyla, 406. 



Cochlostyla (Helicostyla), 405. 



Helicostyla, 405, 406. 



Helix, 405, 406. 

 Dimeregramma, 73. 



bilineatum, 73, 142, 178. 



fluens, 73, 178. 



inflatum, 73. 



minus, 74. 



nanum, 74. 



opulens, 74, 178. 



prismaticum, 74, 178. 

 dimorpha, Stegopoma, 198, 206, 241. 

 Diphasia, 220. 



digitalis, 199, 218. 



huerteli, 199, 218, 241. 



inornata, 199, 219, 241. 



kincaidi, 220. 

 Diploneis, 124. 



biseriata, 109, 110. 



borealis, 106. 



platessa, 123. 



vespa, 124. 

 diplosticta, Navicula, 101. 



Triceratium venulosum, 46. 



