RoPERj on the genus Licmophora. 
61 
pellucid band^ the lower part of the fan being amber- coloured, 
like the upper.'^^ 
With respect to Captain Carmichaers specimens from 
Appin, as far as I can gather from his MSS., the L. flabeU 
lata, Ag., was described in 1826, and has the long, linear- 
cuneate frustules of the true flahellata, not the cuneate form, 
as would be imagined by the statement of the ' Synopsis ;^ 
whereas the Echinella ventilabrum, which was, I believe, the 
foundation of the L. splendida of Greville, and has the broadly 
cuneate valves, appears to have been described in 1829, which 
accounts for its non-appearance in the ' Scott. Cryp. Flora' 
of Dr. Greville, which appeared in 1827. 
With respect to the size of the valves given in the ^ Synop- 
sis,' there is the same discrepancy as in the other points 
noticed, and I should imagine they were both taken from a 
mixture of the two forms. Professor Smith gives '0033 to 
•0078 as the length of his splendida, and "0033 to -0058 as 
the length of hi^ flahellata, or '0055 and '0045 as the average 
length of each. I have carefully measured fifteen gatherings 
of the linear-cuneate variety, from Appin, Cumbrae, and Ayr- 
shire, in Scotland; Neyland, in South Wales; Torbay, in 
the south of England; Bantry Bay, in Ireland; from the 
north and south of France, and Venice ; and find they range 
from '006 to "Oil. And in nine gatherings of the broad 
cuneate variety, from Appin, Cumbrae, and Saltcoats, in 
Scotland ; Paignton, Exmouth, and Salcombe, in the south of 
England ; the north of France, and Venice, the valves range 
from '0035 to '0051. The average of all the gatherings of 
each variety being respectively '0073 for the linear frustules 
and '0048 for the cuneate forms, showing a considerable dif- 
ference from those before quoted from the ' Synopsis.' The 
frustules in the same gathering are generally very persistent 
in size, but I have one gathering from Dunbar, named L. 
flahellata by Dr. Landsborough, in which the stipes is gone 
and most of the valves separated. This contains a mixture of 
the cuneate and linear-cuneate varieties, but the former all 
range from '0045 to -0050, the latter from -0065 to '0070, and 
there is no evidence to show that they are from the same plant. 
From a careful consideration of the foregoing particulars 
I can only arrive at the conclusion, that Professor Smith, in 
describing the species of LicmopJiora, by some intermixture 
of, or examination of wrongly-named specimens, has reversed 
the true names of the species in the ^ Synopsis ;■' and that 
both in the measurements, synonymy, and localities given to 
* Lands. *Pop. Brit. Seaweeds/ p. 337. 
