APPENDIX. 
POLYSIPHONIA PCETIDISSIMA. 
Specimens under this name having been distributed in Dr. Cocks’ Algarum Fasciculi, 
it is necessary to mention that Dr. Harvey does not consider it specifically distinct from 
P. jibrata (fig. 113). It is rather pnrpler in hue; hut whether this arises from anything 
more than its growing on mud in a harbour, w^here the water cannot he so pure as on a more 
open sea, seems doubtful. Its professed habitats are the landing-places on the shore of 
Mount Edgcumbe, and Torpoint. 
DASYA PUNICEA. 
Colour. Bright rosy crimson ; fading to yellow and whitish. 
Substance. Soft, and somewhat gelatinous ; soon decomposing in fresh water. 
Character of Frond. Thread-like {filamentous) ; irregularly, much branched ; bushy ; the 
principal branches widely spreading and hearing many short branchlets on each side. 
Stems unjointed ; the older ones worn naked and smooth ; the younger, throughout 
the plant, closely set with rings (luhorls) of very slender, delicate, soft, jointed 
hranchle^ee? 2 s. These branchle^ee? 2 S, J of an inch long ; many times forked : tapering 
to a point ; their joints from 4 to 6 times as long as broad. 
Measurement. From 2 to 3 inches long, and as much in the spread of the branches. 
Fructification. Of two kinds ; external. 1. Clustered spores, in broadly ovate capsules, with a 
short protruding mouth (urceolate) ; seated {sessile) on the branchlets. 2. Tetra- 
spores in lanceolate, pointed, pod-like receptacles {stichidia) ; on the branchle^ee?i5. 
Habitat. Bognor, October, 1858, Mrs. Gray. Brighton, July and August, 1859, Mrs. 
Merrifield. 
This interesting addition to the list of British Seaweeds resembles Agardh’s Trieste 
species, D. funicea, so closely, that Dr. Harvey believes it may be the same, although differing 
in one particular character; viz. the length of the joints of the branchle^eens. Those of 
Agardh’s plant being short; of the present form, long. 
DASYA CATTLOVM ? 
A form not yet described, from the fact that only one specimen, and that a barren one, 
has as yet been found. This unique treasure was discovered fioating at very low water in 
St. Auhin’s Bay, not far from Elizabeth Castle, Jersey, in August, 1858, by Miss Mary 
Cattlow. Externally, it hears some likeness to an Australian species, D. Gunniana; but its 
characters come nearest to those of the Mediterranean species, D. punicea, above described 
as having been lately found on the British shores. Dr. Harvey considers D. Cattlovice more 
robust, however, and its branchle^eews more generally distributed, and is inclined to think it 
may prove a distinct species. 
It is mentioned here in the hope that such an announcement may induce other collectors 
to make diligent search for more specimens. 
Family IX. WEANGELIACE^. 
NACCAEIA HYPNOIDES. 
Colour. Delicate rosy-red. 
Substance. Very soft and gelatinous ; adhering closely to paper in drying. 
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