[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).