ZOOLOGICAL AND BOTANICAL ASSOCIATION. 7 1 



Meeting of the British Association, in 1858, I described this 

 species, which I had obtained on Zoster a marina in the Isle of 

 Man. On examining the collection of Zoophytes belonging to the 

 Museum of Trinity College, I have detected characteristic speci- 

 mens of it, which were obtained by Miss Ball, I presume, at 

 Youghal in 1836. They are referred to L. gelatinosa, and are also 

 parasitic on the Zostera. 



Note. — Professor W. Thomson has included in his "List of 

 North of Ireland Hydroida" (B. D. Rep. for 1857) the Z. Fle- 

 mingii of Milne-Edwards. But this is not a true species. Fle- 

 ming has erroneously described the L. gelatinosa of Pallas (Edin- 

 burgh Phil. Journ., vol. ii.) as having cells with an even rim (the 

 very delicate crenations having escaped his observation), and on 

 this false diagnosis Milne-Edwards has founded his L. Flemingii. 



Campanulabja. Section /3, unbranched. (Campanularia of Johnston.) 

 Johnstoni (Alder). Dublin (Trin. ColL Coll.). North (Wyville 



Thomson). 

 C. Hincksii (Alder). North, in deep water, common (W. Thomson). 

 Note. — Mr. Thompson has included in his Catalogue the C. vo- 

 lubilis of Lamouroux. At the time when his observations were 

 made, the species of Campanulariadce had been very imperfectly 

 investigated, and several very distinct forms were confounded 

 under the Linnean name volubilis. Mr. Alder, in his Northum- 

 berland Catalogue, has retained this designation for the "small 

 climbing coralline, with bell-shaped cups" of Ellis — a deep-water 

 form, with twisted, not annulated, stem and pedicles, blunt and 

 shallow marginal denticles, and smooth ovi-capsules. He has as- 

 signed the name Johnstoni to the volubilis of the "British Zoo- 

 phytes." 



The figure of volubilis which is given by Solander, and which is 

 copied by Lamouroux ("Exposition Methodique"), is, no doubt, 

 a representation of the branched variety of C. Johnstoni, but the 

 description is evidently founded on specimens of both forms. 



It is impossible to say which species Mr. Thompson may have 

 had before him. The true volubilis, however, has been noticed in 

 the north by Prof W. Thomson. 



Reticulata (Wyville Thomson). 



serpent (Hassall). Common on Sert. abietina (Trin. Coll. ColL). 



