New British Freshwater Alym. By William West. 
13 
Class Protococ coideje. 
Order Eremobium. 
Genus Nephroeytium Nag. 
N. lunatum West (Algae of the Eng. Lake District, Journ. Roy. 
Micr. Soc., Dec. 1892, p. 736, tab. x. fig. 49). 
Forma cellulis crassioribus. 
Long. cell. 17-18 p; lat. cell. 6—6 * 5 /x ; long, tegument. 
43 p ; lat. tegument. 26 p. 
Hab. Mourne Mts., Co. Down, Ireland. 
N. obesum sp. n. Figs. 39, 40. 
N. cellulis subsemicircularibus, angulis rotundatis, ventre 
rectis vel levissime concavis, diametro circiter lj-plo longiori- 
bus ; familiis e cellulis 2 formatis ; tegumento byalino, valde 
incrassato, diametro circiter l|-plo longioribus ; con ten turn 
chlorophyllosum cellularum laete viride granulatum. 
Long. cell. 34—42 p ; lat. cell. 24-28 p ; long, tegument. 
82-90 p ; lat. tegument. 57-71 p. 
Hab. Bog at the side of Angle Tarn, Lake District (1500 
feet). 
The stout subbemispberical cells and the very thick integument 
sufficiently distinguish this species. 
Genus Oocystis Nag. 
O. Nov^: Semlle Wille (Ferskv. Alg. fra Nov. Semi., p. 26, tab. 
xii. fig. 3). 
forma major Wille (1. c., p. 27, tab. xii. fig. 4.) 
F. cellulis in familiis e 16 cellulis formatis consociatis. 
Long. cell. 11*1 /x, lat. 7 /X. Lat. .-long. = 1:1* 58 
„ 11*5 /*, „ 7-5/4. „ = 1:1*53 
„ 12 „ 7-7/4. „ = 1:1*56 
„ 12*5 / 4 , „ 7*9 [x. „ = 1 : 1*58 
Long. fam. 40 /x ; lat. fam. 35 ju. Fig. 24. 
Hab. New Forest, Hampshire. V 
var. maxima var. nov. Fig. 25. 
Yar. cellulis 2-3 -plo major quam forma typica. Fa- 
miliis e 2-4 cellulis compositis. 
Long. cell. 19 fx, lat. 12 /x . Lat. : long. = 1:1*58 
„ 21*4/4, „ 14*2/4. „ =1:1*52 
„ 21*6/4, „ 14 fx. „ = 1:1*54 
„ 22*2/4, „ 14*5/4. „ = 1 : 1*53 
23 fx, „ 15 ix. „ = 1:1*53 
Long. fam. 40-52 /x ; lat. fam. 23-42 fx. 
Hab. New Forest, Hampshire. 
This variety is above twice the size of the typical form, but the 
ratio of the length and breadth of the cells is too near both that of 
