INDEX TO REPORT, PART I., ON THE IRISH DIATOMACEA. 
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The Families, Sub-families, and Genera are printed in Small Capitals, the Species 
in ordinary type. Synonyms are marked with an asterisk. 
abrupta, 293. 
ACHLAMYDIA, 3387. 
acicularis, 304. 
ACTINOCYCLUS, 268. 
ANTINOPTYCHUS, 266. 
acrospheeria, 346. 
acuminata, 305. 
acuta, 407. 
acuta,* 282. 
acutiuscula, 408. 
adriaticum, 319. 
zequalis, 282. 
vestiva, 384. 
affinis (Syn.), 311. 
affinis (Nav.), 367. 
affinis,* 367. 
alpina, 342. 
alternans, 278. 
ambigua, 360. 
amblyoceros, 278. 
americana, 301. 
amphicephala, 299. 
amphiceros, 296. 
amphigomphus, 367. 
AMPHIPLEURA, 281, 320. 
AMPHIPLEUREM®, 320. 
amphirhynchus, 307. 
amphisbeena, 363. 
AMPHITETRAS, 276. 
anglica, 414. 
anglicus, 270. 
angulosa, 364. 
angusta, 300. 
angustata, 415. 
anomalum, 287. 
antediluyiana, 275. 
antiqua, 267. 
apiculata Nae 327. 
apiculata (Nav.), 349. 
apiculata,* 376, 416. 
apis, 400. 
ARACHNoOIDIscus, 265. 
archeriana, 398. 
arcuatum, 318. 
arcus, 311. 
arenaria (Orth.), 251. 
arenaria tN av.), 411. 
areolata, 268. 
argus, 269. 
arraniensis, 395. 
ASTERIONELLA, 281. 
atmospherica,* 259. 
Avxacopiscus, 270. 
AULACOSEIRA.* 254. 
Avtiscus, 270. 
aurea,* 283. 
aurichalcia, 251. 
aurita, 274. 
bacillum, 351. 
baculus, 297. 
bayleyii, 275. 
balfouriana, 316. 
barbatula, 310. 
barkeriana, 362. 
BERKELEYA, 331. 
biceps, 302. 
biceps,* 352. 
biccapitata, 352. 
Bippupuis, 272. 
biddulphia,* 275. 
biddulphianum,* 275. 
BIppULPHIER, 271. 
binodis, 416. 
boeckii (Breb.), 338. 
boeckii (Nav.), 348. 
bombus, 401. 
borealis, 345. 
borrerii, 246. 
BREBISSONIA, 337. 
brebissonii, 350. 
