12 
Transactions of the Society. 
*Calocylindrus De Baryi Arcli. 
Xanthidinm armatum Breb. 
The only species of the genus ; seen in very numerous gatherings. 
Arthrodesmus incus Hass. 
*Staurastrum pilosum N ag. 
„ teliferum Elis. 
,, Pringsheimii Eeiusch. 
„ muticum Breb. 
„ alternans Breb. 
„ tumidum Breb. 1 
* „ aversum Lund. 
Not recorded from Great Britain in Cooke. 
Staurastrum polymorphum Breb. 
„ gracile Klfs. 
„ paradoxum Mey. 
„ proboscideum Arch. 
„ aculeatum Men. 
,, vestitum Elfs. 
longer. 
„ comubiense Benn. 
Closely resembling the Cornish form, but the spines somewhat 
ZYGNEMACE.E. 
Zygnema pectinatum Ag. 
„ cruciatum Yauch. 
Spirogyra nitida Lk. 
„ porticalis Yauch. 
„ longata Vauch. 
„ insignis Hass. 
Zygogonium ericetorum, DBy., var. terrestre. 
Covering large tracts of moss or of boggy soil in the Punchbowl 
with a bright claret-coloured felt, less often a dusky green. Not 
seen in conjugation. 
Mesocarpacee. 
Mesocarpus pleurocarpus DBy. 
Staurospermum gracillimum I lass. 
