112 THE ALGA-FLORA OF CAMBRIDGESHIRE. 
. CO. Enrenseren ae egh. 2. Dernford Fen, 1 mile 8. of 
Shelford. 8. RB. Cam at Cambridge; Sheep’s Green, and in a 
ditch by the Barton Bod near Cambridge; Orwell; Wimpole Park. 
c eet West Fen. 8. Twenty-foot River, between March and 
uyar 
Many examples of this species were obtained from Sutton 
West Fen agreeing almost rea with the ‘forma ventre levis- 
sime inflato, dorso majus curvato quam m in f. typ.’’ mentioned 
by Borge (‘Siissw. Chlor. Archangel,’ Bih. till K. Sv. Vet.-Akad. 
Handl. Bd. 19, Afd. iii. no. 5, 16, t. i. f. 11). Long. 500-541 p; 
lat. 114-137 ». Lat.: long. = 1:3: oe 4, 
88. C. Marinverntanum De Not. 2. Dernford Fen, 1 mile 8. of 
— 3. Sheep's Green, Carico; Wimpole Park. 
C. montuirerum (Bory) Ehrenb. 2. Dernford Fen, 1 mile 
8. of “shaifo rd. 3. In aditch by the Barton Road, near feet 
Hardwick. 7. The Washes, Sutton; in ponds, Mar 
0. C. Lersremnn Kitz. 8. Hardwick. 7. mere on West Fen; 
ponds §. of March. 8. ear _Twent ty-foot River, between 
$150; Dass Ehrenb. 3. Sheep’ Grae. Cambridge. 5. Chip- 
ee Fen 
C. parvutum Nag, 65. ‘hg Fen; Chippenham Fen. 
6. Roswell Pits, Ely. 7. Near Mar 
93. C. Venus Kiitz. 3. aoa 
94. C. Juennert Ralfs, var. rosusrum, var.n. (Pl. 396, fig. 9). 
Var. cellulis curvatioribus apices versus et apicibus aaadonibeas. 
t. 12:5 w; lat. apic. circ. 6-7-5 yz; apic. inter se distant. 61-77 p. 
8. Twenty-foot River, between Wieck and Guy qervie I have also 
examined specimens of this variety from N. Yorks 
C. varerate Nordst. in Wittr. et Nordst. Ale. ‘Exsic. 1880, 
no. 383. Long. 477 m; lat. 57 »; lat. apic. cire. 7°5 5 striis 12 
in 10 p (Pl. 896, fig. 8). 2. Dernford Fen, 1 mile S. of Shelford. 
Pasto de Olaria, Pirassununga, Brazil, , it has no 
been placed on nee for any other locality, and its extraordinary 
occurrence in Cambridgeshire is deserving of particular men ion. 
peculiar for a Closterium of this type; cfr. Nordstedt, l.c. ‘ eo 
chlorophyllaceis circiter 5 sublateralibus nucleos amylaceos m 
in quaque lamina in seriem unicam ordinatos includentibus, asin 
apicali granulis (cire. 10) repletio.” 
