THE ALGA-FLORA OF CAMBRIDGESHIRE. 221 
Marc Park. 5. Wicken Fen. 7. Sutton West Fen; in ponds, 
. 8. quapricorpa (Turp.) Bréb. 2. Shelford. 8. Sheep’s 
ee “Cambridge : ; Lord’s sta ; Wimpole Park. 5, Wicken 
Fen; Burwell Load. 8. Guyhirn 
ar. aBUNDANS Kirchn. 8. Sheep’ s Green, Cambridge; Lord’s 
Bridge. 5. Wicken Fen; Burwell Load. 8. Guyhirne. A granu 
late form of this species was observed from Dernford Fen, 1 one 
S. of Shelford ; long. cell. 15-18 p; lat. cell. 5-7 p 
rd S. atrernans Reinsch. 5. Chippenham Fen. 
8. eee (Turp.) Kitz. Syn. S. acutus Meyen. 2. 
Decatnca Fen, 1 mile % of Shelford. 8. R. Cam at Cambridge ; 
Trumpington. 5. Wicken Fen; Burwell Load. Roswell Pits, 
ly. 7. The Washes, Batted, and Sutton West F 
171. S. anrennatus Bréb. 5. Wicken Fen, ey June, 
ie 
. 8. pentrcutatus Lagerh. var. Linzarts Hansg. 5. Wicken 
thea 6. Roswell Pits. 8. Guyhirn 
*178. S. acurirormis Schréder. 4 Chippenham Fen. 6. Ros- 
well Pits, Ely. The ccenobia observed neat consisted 2 four 
cells, and, seen from the edge view, the terminal cells possessed nly 
three ridges, not four, as figured by Schréder, ‘ Die Alg. der Ver 
suschst. Schles. Fischer. zu Trachenberg, For orachungsherichten 
der Pléner Biol. Stat. Heft 5, 1897, t.i. f. 46. Long. cell. 15-5- 
21 # lat. cell. 5-7°5 »; long. cenob. 22-28 p (Pl. 895, figs. 13-16). 
174. Ruapaipium potymorpHuM Fresen. var. FaALcaTuM (Corda) 
Rabenh. 8. R. Cam at pilin a Hardwick; Lord’s Bridge. 
r . Bur L 
7. Near Marsh ; Sutton West t Fen 
Some forms were noticed from Sheep’s Green, Cambridge, 
which were distinctly tumid, and had slightly Lhe very acute 
poles; they are comparable to var. twmidum West & G. S. West 
(Journ. rye Mier - Boe. 1897, 501, pl. vii. f. 8). Long. 48-68 p; 
t. — 
175. R. a (Corda) Rabenh. 5. Burwell Load. The 
cells were only three or four times longer than their diameter, tr 
many of a cepcacied var. /wnare Kirchn. 
176. RA“DRON MinrMuM (A. Br.) Hansg. 2. Dernford Mi 
1 mile 8. P Shelford. Macy faintly scrobiculate forms were noticed, 
and these might have been placed as var. scrobiculatum Lagerh. in 
Notarisia, 1888, 591. 
177. T. rr1conum (Nag.) Hansg. 5. Wicken Fen. 6. Roswell 
Pits, Ely. 
*178. T. mutioum (A. Br.) Hansg. 6. Sutton. Diam. 15-17 p; 
crass. op. | ' 
