PLUMULARIA. 145 



It is sometimes a foot in height. The largest I 

 have were got by Major Martin in Lough Swilly. Some 

 years ago I gathered great abundance on the shore betwixt 

 Leith and Portobello, with vesicles which Dr. Johnston 

 speaks of as rather rare. In May, 1851, 1 had the pleasure 

 of gathering, at Exmouth, in company with Mrs. Gulson, 

 specimens in line fructification, and of receiving about the 

 same time, from Mrs. Griffiths and Miss Cutler, other spe- 

 cimens loaded with vesicles. Sir J. G. Dalyell states that 

 the specimens are either yellow or white, but that on the 

 same specimen there is not a mixture, for all are yellow or 

 all are white. He has observed that both, when mature, 

 sent forth planulas, little living creatures ; but we have not 

 space for his observations; and, for the same reason, we 

 must refer to Dr. Johnston's excellent work, page 91, for 

 very interesting and instructive observations by Professor 

 Grant. 



2. PLUMULARIA CRISTATA, Podded Coralline, Ellis. (Plate 

 VIII. fig. 23.) 



Hab. On Fuci, especially Halidrys siliquosa. " Some- 

 times on mussels and other shells." Mrs. Griffiths, Miss Cut- 

 ler, Mrs. Alexander, Devonshire ; around the coast of Ire- 

 land, Mr. W. Thompson ; coast of Ayrshire, D. L. ; Dublin 



