218 THE ALGA-FLORA OF CAMBRIDGESHIRE. 
Norges Ferskv.-alg.,’ Christ. Vidensk. Forh. 1880, no. 11, 28, t. i. 
f. 10). 
180. C. suscostatum Nordst. 6. Roswell Pits, Ely. 
131. C. costarum Nordst. spe. Arct.,’ Ofv. af K. Sv. Vet.- 
Akad. Foérh. 1875, no. 6, 25, t. vii. f. 17. Long. 27-29 p; lat. 
25 »; lat. isthm. 10-5 a (Pl. 395, fig. 12). 5. Chippenham Fen. 
This rare species has up to the present only been recorded for the 
British Isles from two localities in Scotland, and its occurrence in 
the fens of the east of England is most unaccountable, being strictly 
se Oe to those cases of C. anceps, C. Holmiense, &e., already 
mentioned, 
. C. Grecoru Roy et Biss. 7. The Washes, Sutton, an 
sation West Fen. 8. Twenty-foot River, between March a 
Gu ae 
3. o. FormMosuLuM Hoff. 5. Chippenham Fen. 7. Sutton 
West. Fen. 8. Guyhirne. 
134. C. quinarium Lund. 6. Roswell Pits, Ely. 
185. C. pramorsum Bréb. 2. Dernford Fen, 1 mile S. of Shel- 
ford. 38. R. Cam at Cambridge ; Sheep’s rig Cambridge ; 
Wimpole Park. 5. Chippenham Fen; Wicken Fen. 6. Roswell 
cin Ely. 7. Sutton West Fen. 8. Guyhirne. 
136. C. Borrytis (Bory) Menegh. 3. oe edge ae 
Trumpington ; Wimpole Park. 5. Wicken Fen. 7. The Washes, 
Sutton; in ponds, March. 8, Twenty-foot River, tal March 
and inne. 
Nas MEDIOLEVE West. 8. Lord’s Bridge. 
7. C. Turpmm Bréb. 2. Dernford Fen, 1 mile S. of Shelford. 
‘2 Ty. Washes, Sutton 
138. C. basdiloand:; sp.n. (Pl. 896, fig. 7). C. submagnum, 
prope 1}-plo longius quam latius, profunde constrictum, sinu 
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anti minoribus, ad medi supra isthmum cum seriebus 
transversis irregularibus tribus ‘sanlorsip parvorum 5-6, mi inu- 
tissima punctata inter granulos; a vertice vise velliptiew polis 
rotundatis; a latere vise circulares. Long. 79 »; lat. 65 p; lat. 
isthm. 17 »; crass. 89 p. 
5. Chippenham Fen: Aug. 1898. 
This species may be compared with C. Kirchneri Berg. (‘ Bidrag 
till Bornholms Desm.-Fl.,’ Sertryk af Botan. Tidsskrift. Kjoben- 
havn, Bd. 17, Hifte 8, 1889, 143, t. vi. f. 8) and C. dentiferum 
Corda (cfr. Nordst. ‘Desm. frin Bornholm,’ Vidensk. Meddel. nat. 
Foren. Kjobenhayn, 1888, 192, t. vi. f. 4, 5), although it differs 
considerably from either of them. It is of the same outward fo 
as C. radiosum Wolle (Desm, U.S. 90, pl. xix. f. 21, 22), but 9 
wise very different. 
