764 THE FRESH-WATER 
Traehelius ovum, 324. 
Trachelocerca olor, 324. 
Triarthra longiseta, 277, 300, 321. 400. 
Trichoptera, 334. 
Trichostomum tortuosum, 187. 
Trientalis europcea, 192. 
Triglochin pahistre, 177, 203, 204, 208, 
214. 
Trinema euchelys, 326. 
linear 326. 
Trochus, 355. 
TuUfex, 355. 
angustifolia, 178, 194, 238, 248, 
328. 
latifolia, 178, 193, 23 6, 217, 238, 240, 
244, 249, 258, 828. 
Ulota hutcMnsice, 329. 
Ulothrix,^ 194, 224. 
ceqitalis, 191. 
(cqualis, var. catccniformis, 191. 
f/Zva, 358. 
C/?iiO, 355, 368, 371. 
margaritifer, 296, 313. 
Vrococcus v/isignis, 333. 
Uroglena volvox, 327. 
Utricularia intermedia, 175. 195, 203, 204, 
211, 231, 328. 
vulgaris, 175, 195, 199, 204, 207, 209, 
214, 217, 248, 328. 
LOCHS OF SCOTLAND 
Vaccinimn myrtillus, 226. 
Valeriana officinalis, 173. 
Vanheurckia rhomboides, 281, 333. 
Vaucheria, 358. 
Veronica anagall is, 174, 214, 328. 
beccabunga, 17 i. 
scutellata, 174, 254, 255, 258. 
Viola palustris, 170. 
Volvox, 282. 
globator, 332. 
Vortex trimcatus, 319. 
Vorticella, 356. 
campanula, 325. 
Xanthidium, 358. 
aculeatum, 331. 
antilopeum, 279, 281, 331. 
armatum, 331. 
controversum, 279, 331. 
cristatum, 331. 
subhastiferum, 279, 331. 
subhastiferum, var. murrayi, 302. 
Zannichellia palustris, 195, 254, 328. 
palustris, var. brachystemon, 179, 250. 
Zostera marina, 357. 
Zygnema, 194, 198, 200, 208, 224, 358. 
vaucherii, 191, 203, 204, 211, 215, 330. 
Zygogonium, 194, 224. 
ericetorum, 191, 223. 
