109 
1861 as Cosm. Colpopelta and 1868 as Cosm. Cordanum 
described according to E-abenhorst 1868, later on 
as Dysphinctiuni viride by some authors. Gor da ’s fi¬ 
gure is doubtful. Cfr above at Colpopelta! 
Corda in Aim. de Carlsb. 1839: Colpopelta 
deplanata, a doubtful Cosmarium {contractum? sec. Tur¬ 
ner). — Strepho cystis didymella is a form of Cosm. 
Botrytis. — The figure of Cosmarium hicuspidatum is 
too incomplete for full identification, although it is to 
be seen that it belongs to the same group as Cosm, 
i^Eu.) elegans Bréb. in Menegh. Syn. D. 1840 and 
Eu. hidentatum Näg. 1849. —r Cosm. fenestratum is 
a form of Eu. ansatum F o eke. — Cosm. cornutum^ 
alatum and quadrangulare are forms of Eu. verrucosum 
Ehrenb. •—• Arthrodesmus senilis and A. asper are 
very probably forms of A. convergens Ehrenb. — 
Arthr. serratus and quadragularis are perhaps Scene- 
desmus HysBix Lagerh. and S. denticulatus Lagerh. 
Corda in Aim. d. Carlsb. 1840: Cosmarium 
dentiferum., which species was reestablished by me 1868. 
Ehrenberg in Berliner Bericht. 1840 has: Des- 
midium divergens, not identified by later authors. — 
Desm. tridens, badly described, which appears in Kiitz. 
1849 to include Staur, paradoxum and controversum. — 
Euastrum octolohum seems to be an Eu., but no later 
author has tried to identify it. — Eu.? pygmeeum was 
by Kütz. 1845 united with Cosm. hioculatum Menegh. 
(non Bréb.), but according to Jacobsen 1876 the 
original specimens belong to Cosm. granatum. — 
Zygoxomtliium Echinus is JLanthidium armatum. 
Before the publishing of Brit. Desm. 1848, Ralfs 
had not seen 2 works, printed in 1847 : 
1. Focke’s Phycol. Studien 1, 1847: Euastrum 
minutum., not identified by later authors. — Eu. bifidum 
is Eu. (Mier.) pinnatifidum Kütz 1845. — Eu. scutum 
is a form of Cosm. truncatum Corda 1834, regarded 
by Richter 1893 as a var. Scutum of Micr. truncata. 
