114 THE ALGA-FLORA OF CAMBRIDGESHIRE. 
Bih. till. K. Sv. Vet.-Akad. Handl. Bd. 1, no. 1, 49, t. iv. f. 7. 
A form with the base of the semicells on each side less ean 
long. 28 p; lat. 19 »; lat. isthm. 5 »; crass. 11 p (Pl. 3 11). 
9. Wicken Fen. This form resembles in some respects spam ium 
sublobatten var. crispulum Nordst 
107. Cosmarium QUADRATUM Ralfs. 5. Chippenham Fen. 
108. C. notmiense Lund. var. inrecrum Lund. 5. Chippen- 
ham Fen. 
109. C. ancers Lund. 5. Chippenham Fen, abundant in a 
ditch: Aug. 1898. Long. 25-27 pw; lat. 14°5-15°3 p; lat. isthm. 
10°5-11°5 4; crass. 10°5 p. The forms observed were a little 
smaller than the type, but piticaraian exactly similar. In Rospraw 
Wydz. matem.-przyr. Akad. Umiej. w Krakow, 1896, xxxiil. 43, 
Gatwinski describes a ‘forma glabra” of Dysphinctium anceps 
a few remarks. It is “regarded as identical with Brats. 
(De Bary) Kirehn., and the characters differentiating it from the 
genus Cosmarium ‘are supposed to be—(1) the cylindrical cells (in 
vertical view circular); (2) the very slight ae ian constriction ; 
and (3) the absence of a basal inflation. But circular vertical views 
are met with along wi every possible grade of constriction (cfr. 
Cosmarium annulatum (Nig.) De Bary, “4 Welwitschii West & G. S. 
panel pa C. 2) te ac West & G. S. West); and species are 
and to say definitely, in all cases, which species ne ag Dy. 
tii a and which to Cosmarium? Even those who most iegls 
uphold the genus D, ysphinctium include in it species of Cosmarium 
with a narrowly linear sinus, such as C. speciosum, C. quadratum, 
&c., and at the same time leave out many others which are less 
deeply constricted. C. microsphinctum has also been placed as a 
—— and this species not only possesses a linear sinus, but 
also nflation on each side of the a cea view In addition to 
Getlenen of this kind, it seems somewhat paradox cal that two such 
rte 2 allied species as C. speciosum and C a cen should be 
plac 
in different genera 
o sum up, Dysphine ctinm te a genus based ae no definite 
would be very acceptable, A i aan i was made 
Turner (‘ Freshw. Alg. of E. India,’ Kongl. Sv. Vet shee eas 
Bd. 25, no. 5, 1892, 73) to divide the genus into s ection 
