454 ZOOPHYTES. 



Found commonly attached to other Zoophytes, picked from the trawl- 

 nets of the Howth (Co. Dublin) fishermen, Dr. Ball and W. T. On the 

 stems of Laminaria dujituta, thrown ashore in Belfast Bay, and similarly 

 procured at Youghal, Miss Ball. Magilligan, Mr. Hyndman. 



Much more delicate and gi'aceful when springing from the stem of its 

 kindred species [Sertnlaria arijcntca, Plumuhiria falcata, &c.) than from 

 those of the Lam. dujitata, the colour also in the former case being of a 

 brighter and more agreeable hue. In the same locality, Belfast Bay, it 

 differs thus according as it emanates from a Zoophyte or Laminaria. The 

 much stronger and more robust development of S. rosacea on the stems 

 of Lam. digitata, remind me of the equally greater development of an 

 Alga {Ptilota plutnosa) upon its stems, than when springing from a rock, 

 and in so far as specimens have come under my observation, each state of 

 the Zoophyte is as permanent, according to the object upon which it is 

 based, as is the case in the Alga. 



The vesicles too, it should be mentioned, differ ; those on my S. rosacea 

 based on the Zoophyte are admirably represented in Ellis's Cor., pi. 4, 

 fig. A. 



S. ijumila, Linn. 



Antrim, Down, and Dublin coasts. Clifden, Connemara, W. T. 



A littoral species growing on the Fuci (especially F. serratus, F. nodo- 

 sus, and F. vesiculosus), in shallow water, and those exposed to the air at 

 every ebb of the tide. At the island of Ireland's Eye (Dublin coast), it 

 most profusely invests the Fuci exposed at low water, so that a person 

 might say with truth that he could walk for some distance treading all 

 the time on S. putnila. "W. T. 



On Fnrcellaria fastif/iata, &c. At Youghal, Miss Ball.* BaUysodare 

 Bay, Co. Sligo, Mrs. Hancock. Magilligan, Mr. Hyndman. Ballantrae, 

 Ayrshire, and Fresh-water Bay, Isle of Wight, W. T. Foreign specimens 

 are in my collection from California, Cape of Good Hope, and Van Die- 

 men's land. 



April 14th, 1841. 



It not only grows abundantly on Fuci attached to large stones between 

 tide-marks at Cultra, but the entire otherwise bare side of a huge stone is 

 bearded with it. Fuci however cboop over the side of the stone from 

 above, rooted on the top of the stone. 



S. innaster, Ellis. 



This species, exactly as represented by Ellis, and bearing vesicles, was 

 dredged at the entrance to Belfast Bay, by Mr. Hyndman, who has ob- 

 tained it by similar means from a depth of 40 fathoms near Sana Island, 

 on the Scotch coast, both in 1841 and 1842, but on both occasions the 

 few specimens were without vesicles, as was likewise a specimen dredged 

 by Capt. Beechy, R. N., off the Mull of Galloway, at the depth of from 

 110 to 140 fathoms. In some cases a single plume, in others several, 

 spring from the same base. The branches are more produced than re- 

 presented by Ellis and Solander, and in one instance secondary branches 

 are thrown out, as we see in luxuriant specimens of its near allies, Sert. 

 abietina, and S.Jilicula. Dr. HassalFs Sert. Margarita seems to me only 

 a variety of this, differing in the vesicles. Specimens of the form he de- 



* In whose collection are specimens from this locality in a free branclied 

 state, not adherent to any other object. 



