298 THE ALGA-FLORA OF CAMBRIDGESHIRE. 
ar. 1a Van Heurck. 38. Ditch, St. John’s College ‘‘ backs,” 
and Shows Gaon Cambridge. 5. Burwell. 
395. N. par ‘ 1. On damp ground, New Museums, 
Caiibeiige. 3. Comberton. 
396. N. stemorpea (Ehrenb.) W. Sm. 2. Shelford. 3. Ditch, 
St. John’s College «“ backs,” and Sheep’s Green, Cambridge ; 
Trumpington; Comberton; Lord’s Bridge; Wimpole Park. 5. 
-o Fen. 6. Near Ely. 7. Ditches and ponds near March. 
uN: ee (Kiitz.) Grun. 38. Ditch, St. John’s 
Colleze Sr beaks ” Cambrid 
B ae N. curvuna (Ehrenb.) W. Sm. 3. Trumpington; Lord’s 
ri 
399. ostusa W. Sm. var. nana Grun. 8. Ditch, St. John’s 
pt = backs,” Cambridge. 
. N. yivgaris (Ag.) W. Sm. 2. Dernford ve 1 mile S, of 
Shelford. 3. ee fia paaae: Coton. 4. Histo 5. Burwell; 
Chippenham 
Var. TENUIS (W. Sm.) Grun. shee N. tenuis W. Sm. 8. Lord’s 
cae Wimpole Park. 4. Hist 
. N. sustiuis Gron. 3. Seve Wimpole Park, abundant 
on dein mud: June, 1898. 7. Sutton West Fen 
Var. PALEACEA Grun. 3. Wimpole Park. 7. Sutton West Fen. 
402. N. Pazsza (Kiitz.) W. Sm. 3. Ditch, St. John’s College 
‘backs, Cambridge; Wimpole Park. 5. Chippenham je 6. 
ig Ely; Sutton. 7. Near March; Sutton West Fen. 8. Guy- 
Var. pesmis Van Heurck. 2. Dernford Fen, 1 mile S. of Shel- 
ford. 1. Sutton West Fen. 
403. N. ampniera Grun. 8. Sheep’s Green, Cambridge. 4. 
Chippenham Fen. 6. Near Ely. 
4, N. ao (Kiitz.) W. Sm. Syn. Nitzschiella aoeie 
Rabenh. 2. Shelford. 8. Ditch, St. John’s College ‘ backs,” a 
Sheep’s Green, Cambridge ; Trumpington 
Order Crypro-RAPHIDIER, 
Fam. Me.osirE&. 
405. Mernosrra vartran s Ag. 2. Dernford Fen, 1 mile S. of 
Shelford. 8. Ditch, St. John’s College ‘‘ backs,” R. Cam (with 
sporangia), and Sheep’s Green, Cambridge; Trumpington 
Girton. 5. Burwell. This plant ‘exhibits epistrophe and apostrophe 
of the chromatophores 
406. Cyrconorenna Renal ctana Chauvin. 38. River Cam at Cam- 
bridge, and also many ditches about the town 
407. C. eas Kitz. 4. pat n. 5. Wicken Fen; 
Chippenham Fen. 6. Near Ely. 7. Near March, very abundant: 
Aug. 1898; Sutton West Fen. 
408. C. opercunata Kiitz. 5. Wicken Fen; Chippenham Fen. 
