[385] Solms-Laubach (952).
[386] A similar method of fossilisation has been noted by Rothpletz in the case of the Lower Devonian alga Hostinella. [Rothpletz (96) p. 896.]
[387] Penhallow (96) p. 47.
[388] Carruthers (72) p. 162 regards this species as identical with N. Logani.
[389] Seward (953).
[390] Strickland and Hooker (53).
[391] Hicks (81) p. 484.
[392] Dawson (82) p. 104.
[393] Barber (89) and (90).
[394] Murray G. (953).