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PLATE VII.<br />

Fig. 270. Pleurosigma Hippocampus, Win. Sm., p. 255.<br />

Fig. 271. Pleurosigma attenuatum, Wm. Sm., p. 255.<br />

Fig. 272. Pleurosigma Balticum, Wm. Sm., p. 255.<br />

Fig. 273. Pleurosigma Balticum, var. Brebissonii, p. 256.<br />

Fig. 274. Pleurosigma acuminatum (Kiitz), Grun., p. 256.<br />

Fig. 275. Pleurosigma strigilis, Wm. Sm., p. 256.<br />

Fig. 276. Pleurosigma Spencerii, Wm. Sm., var. Fig.<br />

Smithii, p. 257.<br />

277. Pleurosigma Spencerii, var Kiitzingii, p. 257.<br />

Fig. 278. Pleurosigma Spencerii, var. nodifera, p. 257.<br />

Fig. 279. Pleurosigma Spencerii, var. curvula, p. 258.<br />

Fig. 280. Pleurosigmai Parkeri, Harrison, p. 258.<br />

Fig. 281. Pleurosigma Fasciola, Wm. Sm., p. 258.<br />

Fig. 282. Pleurosigma macrum, Wm. Sm., p., 259.<br />

Fig. 283. Pleurosigma eximium (Thw\), H.V.H., p. 259.<br />

Fig. 284. Pleurosigma scalproides, Bab., p. 259.<br />

Fig. 285. Fig.<br />

Pleurosigma attenuatum, var. scalprum, p. 255.<br />

296. Fig. 297.<br />

Gomphonema constrictum, Ehr., p. 2?0.<br />

Gomphonema constrictum, var. capitatum, p. 270.<br />

Fig. 298. Gomphonema constrictum, var. curta, p. 270.<br />

Fig. 299. Gomphonema acuminatum, Ehr., p. 270.<br />

Fig. 300. Gomphonema acuminatum, var. coronatum, p. 271.<br />

Fig. 301. Gomphonema Augur, Ehr., p. 271.<br />

Fig. 302. Gomphonema Augur, var. Gautieri, H.V.H., p. 271.<br />

Fig. 303. Gomphonema montanum, Schumann, p. 271.<br />

Fig. 304. Gomphonema montanum, var. subclavatum, p. 272.<br />

Fig. 305. Gomphonema montanum, var. commutatum, p. 272.<br />

Fig. 306. Gomphonema parvulum, Kiitz, p. 272.<br />

Fig. 307. Fig. 308.<br />

Gomphonema parvulum, var. lanceolata, p. 272.<br />

Gomphonema parvulum, var. subcapitata, p. 272.<br />

Fig. 309. Gomphonema gracile, Ehr., p. 272.<br />

Fig. 310. Fig. 311.<br />

Fig. 312.<br />

Gomphonema gracile, var. dichotomum, p. 273.<br />

Gomphonema gracile, var. auritum, p. 273.<br />

Gomphonema micropus, Kiitz, p. 273.<br />

Fig. 313. Gomphonema intricatum, Kiitz, p. 273.<br />

Fig. 314. Gomphonema angustatum, Kiitz, p. 273.<br />

Fig. 315. Gomphonema olivaceum, Kiitz, p. 274.<br />

Fig. 316. Gomphonema olivaceum, var. vulgaris, p. 275.<br />

Fig. 317. Fig.<br />

Gomphonema exiguum, Kiitz, p. 275.^<br />

318. Gomphonema exiguum, var. minutissima, p. Fig. 319.<br />

275.<br />

Bhoicosphenia curvata (Kiitz), Grun., p. 275.<br />

Fig. 320. Bhoicosphenia curvata, var. marinum, p. 276.<br />

Fig. 321. Bhoicosphenia Van Heurckii, Grun., p. 276.

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