20 PLANTS FROM NEW CALEDONIA. 
CycLoTELLA MENEGHINIANA Kütz. Canala; in washings of Azolla from 
roadside ditch. 1359. 
TABELLARIACE. 
TABELLARIA FLOCCULOSA Kiitz., var. VENTRICOSA Grun. River Dumbea ; 
amongst filamentous alge. 809. Ouendjam Forest; in washings from 
Potamogeton in slowly running stream. 1986. 
DIATOMELLA BALFOURIANA Grey. Long. 9-l4 p ; lat. 3-45. (PI. 4. 
figs. 11-13.) River Dumbéa; amongst filamentous alge. 809. Mont 
Humboldt ; with Blue-green alge in rock pools. 1045a. The specimens 
agreed very well with the original figures of Greville(Ann. Mag. Nat. Hist. 
vol. xv. 1855, t. 9, figs. 10-13), but differed somewhat from those of later 
authors. For whereas this diatom is usually figured as linear-elliptie in the 
valve view, and slightly tumid in the middle, Greville’s figures show an 
exactly linear-elliptic valve view without any trace of a median swelling. 
The New Caledonian specimens also were oval to elliptic in the valve view 
according to the size of the individual, without any median tumidity. ‘The 
specimens further showed the presence in the valve view of a conspicuous 
median slit in the internal septum connecting longitudinally the three windows 
(Pl. 4. fig. 12). These slits do not seem to have been noted previously, yet 
it is strange that they should have been overlooked, since they are very con- 
spicuous in the valve view. The raphe is a mugh more delicate structure 
which could not be confused with the slit, which it overlies. The raphe is 
only seen when the valve, without the septum, is separated from the frustule 
(Pl. 4. fig. 11). The diatom was partieularly abundant in 1045 a. 
DENTICULA ELEGANS Kütz. Plaine des Lacs ; in shallow rain pools. 338. 
River Dumbéa: amongst filamentous alge in rock pools. 809. Mont 
Humboldt; amongst Blue-green algæ in rock pools. 1045a. River Ngoye ; 
amongst filamentous algæ in rock pools. 2411. 
FRAGILLARIACEZÆ. 
SYNEDRA ULNA Ehrenb. Ermitage stream ; in pools. 176. Mont Dore; 
in pool, littoral zone, at mouth of small stream. 852. Mont Canala ; 
amongst filamentous alge in sluggish stream. 1242. Canala ; in washings 
of Azolla and Lemna, and amongst other algæ in streams and pools. 1356, 
1357, 1359. Ouendjam Forest; in washings of Potamogeton from slowly 
running stream. 1986. 
S. acus Kütz. Canala ; in washings of Azolla in roadside ditch. 1359. 
Mont Dore ; in pool in littoral zone. 852. 
