Freshwater Algae of S. of England. By W. & G. S. West. 489 
G. trachypleurum Lund. var. minus Bacib. forma Borge (in Bih. 
till K. Sv. Vet.-Akad. Handl., Bd. 19, Afd. iii. p. 28, t. ii. fig. 30) is 
G. subpunctulatum var. Borgesenii ) and not a form of G. trachy- 
pleurum . 
72. G. sphaleroslichum Nordst. III. Th. VII. Gp. VIII. T., W. 
73. G. abr upturn Lund. VIII. H. 
74. G. Blyttii Wille. III. Bi., Th. 
Var. Nov^i Sylv.® var. n. (PI. VI. fig. 10.) 
Var. paullo major, oblongo-subrectangularis, crenis late- 
ralibus prominentibus et truncatis, serie singula 
granulorum (10) intra margines, in centro semi- 
cellularum cum annulo granulorum 5, eo superiori 
maximo. 
Long. 22 c] lat. 17*5 p ; lat. isthm. 5*5 p\ crass. 
10 ii. VI. N. 
This variety was in abundance, and is nearest to G. Blyttii subsp. 
Hoffii Borgesen, from which it differs in being proportionately longer, 
in its more pronounced lateral crenations, and in the central granules 
of the semi-cells. In comparing our variety with Borgesen’s, we have 
taken his figure, which is almost as broad as long; his measure- 
ments indicate that it is 1^ times longer than broad, and are evi- 
dently incorrect. His figure is also under a wrongly stated magni- 
fication. 
75. C. Boeckii Wille. III. Mp., Bp., Wi. IV. He. VI. N. 
VIII. H. 
76. G. subcostatum Nordst. I. Ep. II. Ha., U. III. M. (very 
abundant), 1894, Mp., Pu., Th. IV. He. 
77. C. eastidiosum sp. n. (PI. VI. fig. 11.) 
C. parvum, paullo longius quara latum, profunde constric- 
tum, sinu angusto lineari extremo ampliato ; semicellulae 
angulari-semicirculares, angulis basalibus rotundatis, apicibus 
late truncatis, in margine laterali unoquoque granulis 7 (vel 8), 
apicibus glabris, granulis minutis paucis intra margines sub- 
concentrice ordinatis, in centro granulis majoribus depressis 
3-4 ; a latere visae globosae ; a vertice. visae ellipticae ; ad 
medium utrobique cum granulis latis depressis tribus, polis 
granulatis cum granulis minutis in seriebus transversis ordi- 
natis, in centro glabro ; pyrenoidibus singulis magnis. 
Long. 37-38*5 p,; lat. 33-36 p ; lat. isthm. 11 p; 
crass. 21 p. V. Go., frequent. 
This species approaches G. subreniforme Nordst., G. subcostatum 
Nordst., and C. Boeckii Wille, but differs sufficiently from all of them, 
*78. C. alatum Kirclin. VII. S. 
79. G. Gregorii Boy et Biss. III. Pu. VII. S. 
80. G. Kjellmani Wille subsp. grande Wille. III. Ka. 
2 m 2 
