266 THE ALGA-FLORA OF CAMBRIDGESHIRE, 
263. Terrapepia ciaucescens (Wittr.) Boldt. 2. Dernford Fen, 
1 mile 8. of Shelford. 6. Roswell Pits, Ely. 7. Sutton West Fen. 
264. niga alae aponina Kitz. 5. Chippenham Fen ; 
Wicken F 
265. et ROsEO-PERSICINUS (Kiitz.) Cohn. Syn. Proto- 
coccus roseo-persicinus Kiitz.; Polycystis roseo-persicinus (Kiitz.) Gutw. 
5. Chippenham Fen; Wicken Fen. 6. Roswell Pits, Ely. 
a in ponds. 
s plant, described by Kiitzing as a bien of Protococcus, 
was aad by Cohn (in Rabenh. Alg. Europ., Dec. 232-233) under 
the genus Clathr ocystis Henfrey, and still tater referred by Gutwinski 
(‘ Fl. Algar. Galic.,’ op aft Wydz. m fre bey Akad. Umiej. 
larg 
aying vegetation, thus Poaiee! very suitable conditions for 
ps growth of this alga, and the finely-developed specimens which 
found in these —— are quite as ‘‘clathrate’”’ as any 
y- ) 
of this character ts certainly agree W with Cohn in placing the le 
under the genus lai ocystis, although 1 young specimens would 
quite correctly referred to the genus Polycystis. The former pale 
appears merely to include the more finely-developed examples of 
bow of the latter genus 
6. Ponycystis marginara (Menegh.) Richter. 8. Sheep’s 
Gn, Cambridge 
i . P. ELABENS s (Bréb,) Kiitz. 5. Wicken Fen. 7. In ditches, 
arc 
268. Porpnyriprum crurnrum (Ag.) Nag. 1. Wall of the Senate 
House, and by th e Leys School, Cambridge. 8. Newnham Mill, 
Cambridge. I fully nares with Hansgirg i in referring this plant to 
cl Batters has given dita ot marine blue-green sleds becoming 
red owing to adaptation to greater depths and less light. Moreover, 
Por phyridium is — always raion solely in association with 
other Myxophyce 
269. Cxnoacocr turcipus (Kiitz.) Nag. 5. Wicken Fen; 
Chippenham Fen 
270. C. patuipus Nag. 5, Chippenham Fen. 
271. C. Rurescens (Bréb.) Nig. 5. Chippenham Fen. 7. Ponds 
8. of March. 
e 272. O. minor (Kiitz.) Nag. 5, Wicken Fen. 6. Roswell Pits, 
y 
