208 MAJOR-GEN. NELSON AND PROF. DUNCAN ON THE 
DESCRIPTION OF THE PLATES. 
PLATE XXVI. 
. Corallina tuna: natural size. 
. À joint magnified, and showing the hirsute surface and the long branching internal cells. 
. Filiform processes or hairs from the outside of Corallina tuna, magnified. 
. А portion of the surface of an old and dry specimen of Corallina tuna, magnified, showing the 
spots in the cells where there is no carbonate of lime. 
Fig. 5. An external cell of the same Coralline, more highly magnified. The dark spot is the position of 
the former attachment of a hair or filament. 
Fig. 6. An external cell collapsed and the relics of a dried filament, magnified. 
Fig. 7. External cells of the frond of Corallina tuna decalcified, and magnified. 
Fig. 8. Part of the edge of a decalcified frond of Corallina tuna, showing the hairs and glandular markings 
on them, magnified. 
Fig. 9. The large simple and branching cells of the interior of the frond which terminate at the bald of 
external cells, magnified. 
Fig. 10. A portion of the dried fronds of Corallina tridens. 
Fig. 11. A portion of a fresh frond, magnified, showing the superficial hirsute covering of filamentous 
growth. 
Fig. 12. A group of hairs arising from the external cells of the frond of the same Coralline, magnified, 
from a fresh specimen. 
Fig. 13. The appearance of the external layer of cells, with vestiges of dried filaments and of parts with- 
out carbonate of lime, magnified, from a dry specimen. 
Fig. 14. A group of Corallina vermicula, after Nelson and from the living specimen. 
Fig. 15. A fresh frond, magnified, from the life, showing the oblique and long hairs, of Corallina 
vermicula. 
Fig. 16. A group of external cells and their long hairs, from a fresh specimen, magnified. 
Fig. 17. External cells of Corallina vermicula with broken cell-wall, indicating rupture of the filaments. 
From a dry specimen, magnified. 
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Figs. 2, 3, 11, 12, 14, 15, 16, аге Жо drawings from nature by Major-General Nelson, R.E.; 
figs. 1 and 10 are from specimens collected by Major-General Nelson. 
Figs. 4, 5, 6, 7, 8, 9, 13, 17, are drawn from specimens prepared by Prof. Duncan, and under his 
direction. 
Prate XXVII. 
Fig. 1. A portion of a young frond of Corallina officinalis, magnified. 
Fig. 2. A portion of the same frond close to the edge of an articulation, showing scattered and long 
з 5555,:,:8mple hairs, magnified. Ў 
Hon > А portion of the surface of a | frond decalcified. The lower arched portion has become separated 
from the upper and darker part by accident ; it indicates the superficial layer of cells. Magnified. 
` ВЕ 4. Тһе superficial cell-layer, from above, magnified. 
~ 5. The The appearance presented by the outer cells of the frond beneath the layer above (figs. 3 and 4) 
_ ш decalcified құсалы. The thickness of the cell-wall and its incomplete condition are shown. | 
