14 
Transactions of the Society. 
the type and of the f. major for separation. The apices of the cells 
are also not incrassated. 
0. elliptica West (Algae of the Eng. Lake District, Jonrn. Eoy. 
Micr. Soc., Dec. 1892, p. 736, pi. X. fig. 56) forma minor 
West (1. c.) 
Long. cell. 18 /x ; lat. cell. 8 • 2 fx. Lat. : long. = 1:2-19 
„ 19 fx ; „ 8-8 ju. „ =1:2-15 
„ 20*2 fx; „ 9 ‘6 ju. „ = 1:2*10 
„ 20-8 ju; „ 10 ju. „ =1 : 2-08 
Long, fam, 52 ju ; lat. fam. 35 ju. Fig. 26. 
Hab. Derryclare Lough, Connemara, Ireland. 
The last and the preceding tables show the difference in the com- 
parative length and breadth of the cells between 0. elliptica f. minor 
and forms of 0. Novas Semliae. 
0. gigas Arch, in Quart. Journ. Micr. Science, 1877, p. 105 ; 
Cooke, Brit. Freshw. Alg., p. 26. 
O. magna ; cellulis solitariis vel in familiis e 2 cellulis 
formatis consociatis ; cellulis late ellipticis, 1 J-plo longioribus 
quam latioribus, apicibus latissime rotundatis et non-incras- 
satis ; contentum chlorophyllosum cellularum granulosum kete 
viride. 
Long. cell. 41 /x; lat. cell. 32*5 /*. Lat. : long. = 1:1-26. 
,, 50'5/x; ,, 40 fx. ,, = 1:1*26. 
Diam. fam. 1 cell. 67 X 52 /x. 
Hob. Lough Shannacloontippen, Connemara, and Slieve 
Donard, Co. Down, Ireland ; Bowness, Lake District. 
f. minor. Fig. 28. 
F. cellulis minoribus, lf-plo longioribus quam latioribus, 
singula vel in familiis e 4 cellulis compositis. 
Long. cell. 36*2 fx; lat. cell. 26 /x. Lat. : long. — 1 : 1*39 
„ 38 fx; „ 27 /*. „ = 1:1*40 
„ 40 fx; „ 28*5 /x. „ =1:1-40 
Fam. 4 cell. 76 x 63 fx. 
Hob. Derryclare and Shannacloontippen Loughs, Conne- 
mara, Ireland. 
var. incrassata var. n. Fig. 37. 
Yar. membrana cellularum incrassata et apicibus in- 
crassatis et subprotuberantibus. 
Long. cell. 56 //, ; lat. cell. 39 yu. 
Hob. Gunwen Moor, Cornwall. 
This variety has the cells somewhat compressed at the sides, and 
the apices are thickened and project slightly. 
0. asymmetrica sp. n. Fig. 27. 
O. parva ; cellulis semper solitariis, asymmetrice oblongo- 
ellipticis, 2J-plo longioribus quam latioribus, dorso valde con- 
