SERTULARIADjE ! PLUMULARIA. 95 



Corall. und Zoophyt. der Sudsee, 25. Plumularia pennatula, Lam. Anim. s. Vert, 

 ii. 128 : 2de dit. ii. 165. Fkm. Brit. Anim. 546. W. TJtompsan in Ann. Nat. 

 Hist. v. 251. Couch Zooph. Cornw. 16 : Corn. Faun. iii. 33. 



Hah. Coast of Devonshire, rare, Montagu. " On the Pinna 

 ingens, deep water, rare," Cornwall, Couch. Also from the Corwich 

 crab, and from the stems of Laminaria digitata, C. W. Peach. " Spe- 

 cimens of this rare and beautiful species profusely invest about six 

 inches of the stem of a Laminaria digitata obtained in a fresh 

 state by Miss M. Ball, at Youghal, in 1837," W. Thompson. West 

 coast of Ireland, near Roundstone in Galway, W. M'Calla. 



" This coralline is as remarkable for the elegance of its form, as 

 its likeness to the feather of a pen." The polypidom is attached by 

 a wrinkled anastomosing fibre, and rises occasionally, even in our 

 seas, to the height of five inches : it is simply pennated, and very 

 graceful. Rachis filiform, straight, naked below, of a darker colour 

 than the yellowish -brown pinnae : these are close-set, alternate, 

 erecto-patent, either spreading out or secund : cells regularly placed, 

 with a joint between each, rather small, sub-erect, cup-shaped, with a 

 wide aperture, whose margin is sinuated or waved, " with a little 

 spine on each side ;" and they are seated in the axil of a long 

 tubular incurved process, which rises much above them. 



Lamouroux has conjectured that the PL pennatula of Fleming is 

 only a repetition of PL myriophyllum ; and Milne-Edwards refers 

 it to PL cristata. I cannot see the slightest foundation for these 

 suspicions. 



"That variety of the Podded Coralline (PL cristata), which has 

 the lengthened sub-marginal spine, bears a great resemblance to 

 this species. But it is distinguished from it, by the cells being on 

 the upper margin of the pinnae, deeply tubular, by the regularity 

 and decided manner in which the margin is dentated, and by the 

 spine, though long, projecting from the side of the cell, leaving 

 a space between it and the margin of the mouth, which is not the 

 case in this species." R. Q. Couch. 



4. P. FINN AT A, stem plumous, the pinnae alternate, three on 

 each internode ; cells rather distant, campanulate, leaning, the 

 rim entire ; vesicles pear-shaped. Dillenius.* 



* Born in 1687, at Darmstadt, in Germany; came to England in 1721 ; and 

 died at Oxford, in 1747. He was the first Professor of Botany there, and has not 

 been equalled in celebrity by any successor. It is unnecessary to give particulars of 

 so eminent a man. For his life I may refer the reader to Pulteney's Sketches, v. ii., 



