New British Freshwater Algae. By William West. 
15 
vexis, ventre leviter convexis ; apicibus incrassatis et acurni- 
natis ; contentum cellularum viride granulatum. 
Long. cell. 15 ft; lat. cell. 7 ft. 
„ 17 ft; „ 7-4 ft. 
„ 18 ft ; „ 8'6 u. 
Hab. Chobham Common, Surrey ; Bowness, Lake District ; 
Wbernside, W. Yorks. ; Lough Aunierin, Connemara, Ireland. 
A very frequent species, nearest to 0. apiculata West (Notes on 
Scotch Freshw. Alg. in Journ. Bot., April 1893, tab. 333, figs. 7 et 8), 
but having a characteristic and constant form. 
0. solitaria Wittr. in Wittr. et Nordst. Alg. aq. dulc. exsic., 
No. 244. 
f. major Wille (Ferskv. Alg. fra Nov. Semi., p. 26). 
Forma cellulis subacutis ad unumquemque polum. 
Long. 48 jjb ; lat. 25 //,. Fig. 30. 
Hab. Scarf Gap Pass, Lake District. 
var. notabile var. n. Fig. 29. 
Yar. cellulis lateribus subrectis et incrassatis ; mem- 
brana irregular iter punctata. 
Long. 29 ja; lat. 16*5 /i. 
Hab. Amongst Batrachospermum vagum Ag., Tore 
Mt., Co. Kerry, Ireland. 
0. nodulosa sp. n. Fig. 31. 
O. mediocris ; cellulis solitariis vel in familiis e 2 cellulis for- 
mats consociatis ; cellulis oblongo-ellipticis, 1 J-plo longioribus 
quam latioribus, apicibus late rotundatis et nodulis incrassatis. 
Long. cell. 25 tt; lat. cell. 16 ft. 
„ 25 ft; „ 16-5 ft. 
„ 26 ft ; „ 17 ft. Fam. 44 x 41 ft. 
Hab. Cromagloun, Co. Kerry, Ireland. 
The nodular thickening at each pole along with the more broadly 
elliptical cells distinguishes it from 0. crassa Wittr. (vide fig. 32 for 
comparison). 
0. crassa Wittr. in Wittr. et Nordst. Alg. Exsic., No. 355. * 
Contentum chlorophyllosum cellularum in massis pulvinatis 
parietalibus 8. 
Long. cell. 19 ft ; lat. cell. 13 ’5 ft. Lat. : long. = 1 : 1*42. Fig. 32. 
Hab. Lanlivery Moor, E. Cornwall. 
0. panduriformis sp. n. Figs. 33-35. 
0. magna; cellulis solitariis vel in familiis e 4-8 cellulis 
formatis consociatis ; cellulis 2-2^-plo longioribus quam latior- 
ibus, ovatis, lateribus leviter concavis, apicibus incrassatis et 
subacutis. 
Long cell. 50 ft; lat. medio 23 ft ; lat. max. 25 ft. Lat.. : long. = 1:2 
„ 57 ft; „ 23*5 ft; „ 25 ft „ = 1:2*28 
j, 58 ft ; „ 25*5 ft ; „ *27 ft ,, =1:2*15 
,, 61 * 5 ft ; ,, 23 ft ; ,, 25 ft ,, =1:2* 46 
Fam. 8-cell. 170 x 146 ft. 
