122 
BRITISH FRESH WATER ALGA?. 
Euastrum ornithocephalum, Bennett Journ. Roy. Micr. Soc. 1886, 
p. 9, *,!,/. 12. 
Front minute, 57 p> long, 30 p broad. Each frustule with a 
basal and central rounded lobe and a terminal lobe moderately 
deeply divided vertically, and with a single projecting tooth, the 
lobe resembling a bird’s head. Sutural division somewhat shallow. 
Cell wall tuberculated. 
Bog pool. Loughrigg. 
Near E. rostratum and E. pseudo-elegans, Turn, but somewhat 
larger ; the terminal lobe resembling that of E . elegans. 
Euastrum Lundellii, Bennett Journ. Roy. Micr. Soc. 1886, p. 9, t. 1, 
f. 13. E. binale y elobatum, Lund. Desm. Suec. p. 23, t. 2, /. 7. 
Frond very minute, 28 p long, 14 p broad, truncately elliptical 
in outline. Frustule 3-lobed ; terminal lobe truncate, gibbous, 
slightly concave, entire, 11 p broad. Sutural constriction deep. 
Each frustule with a moderately conspicuous projection in the 
centre. 
Among Sphagnum. Loughrigg. 
Cosmarium Wittrockii, Lund. Desm. Suec. p. 31, t. 3, f. 14. Bennett 
Journ. Roy. Micr. Soc. 1886, t. 1, /. 15. 
Frond very minute, shape of C. margaritiferum , but not crenu- 
lated, nearly circular in outline, 25 p long, 22‘5 p broad ; the 
two frustules slightly unequal; constriction deep ; isthmus 10 p 
broad. Cell wall not punctated, perfectly smooth. 
In bog pools. Loughrigg. 
Cosmarium oblongum, Bennett Journ. Roy. Micr. Soc. 1886, p. 10, t. 1 
/. 16. Cosmarium sp., Reinsch. Contr. 82, t. 42, /. 3. 
Frond minute, 55 p long, 22 p broad at its broadest part ; each 
frustule elliptical, longer than broad, equally rounded at the base 
and the apex; isthmus 11 p broad. Cell wall not punctated, per- 
fectly smooth. 
Bog pools. Loughrigg. 
Xanthidium spinulosum, Bennett Journ. Roy. Micr. Soc. 1886,2?. 11, 
t. 2,/. 17. 
Frond moderately large, shape of X. fasciculatum ; each frus- 
tule elliptical or slightly hexagonal, 80 p long by 40 p deep ; 
isthmus 60 p. Each frustule furnished with four pairs of gemi- 
nate curved spines, about 25 p long; the whole of the rest of the 
edge ciliated with closely-set spines or teeth, in one specimen about 
12 p long, in another specimen much shorter. Endochrome very 
granular, with a lighter, less granular portion in the centre of each 
frustule. 
Stream between Codale and Stickle Tarns, at an elevation of 
about 1,800 feet. 
Staurastrum bullosum, Bennett Journ. Roy. Micr. Soc. 1886,2?* 
f. 18-20. 
Frond moderately large ; each frustule elliptical, more than 
twice as long as broad ; 85 p long, 38 p wide, triangular in front 
view, united by a narrow isthmus, 35 p wide. Each frustule with . 
a hemispherical projection, which is very conspicuous, especially on 
