HYDROIDA. 457 



Magilligan, Mr. Hyndman : here and on the Dublin coast it grows most 

 luxuriantly, occasionally attaining a foot or a little more in height ; and 

 is often densely branched, in which state, and when uninjm-ed, it is a 

 very beautiful object. 

 Clew Bay, W. T. 1840. 



P. crisfata, Lamx. 



Youghal, Dublin Bay, Miss Ball. Waterford coast. Miss A. Taylor. 

 Ballysodare Bay, Co. Sligo, Mrs. Hancock. Down and Antrim coasts. 

 Alum Bay, Isle of Wight (in profusion, Sept. 1841), W. T. ; all my spe- 

 cimens from these localities are on Ilalidri/s sUiquosa. A. Plumidaria in 

 my collection, obtained at California by Dr. Sinclair", seems in every x'e- 

 spect identical with native specimens of P. cristata. 



P. pennatiila, Ellis and Soland. 



Specimens 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. It must rather, I presume, have been 

 owing to the East Indies being the locality whence the specimens de- 

 scribed by Ellis and Solander Mere brought, than to any fault in Fleming's 

 description (which seems as good as one so brief could be), that led some 

 authors on the continent to attribute it to other species. The Irish spe- 

 cimens correspond with the descriptions in the works of Ellis and So- 

 lander, Fleming and Johnston, and with the figures in the first and last — 

 some of them are 4|- inches in height. 



Found also at Round stone by Mr. M'Calla. 



Dec. 29, 1851. — I saw a very fine group of this species to-day in Miss 

 Ball's collection. It, with several other groups, was found at Ballycotton 

 (Co. Cork) in August last by Miss Gaggin. The piece I saw appeared 

 attached to the stem of a common Laminaria (tangle). 



P. pinjiata, Lamx. 



In Mr. Templeton's collection there are specimens of this Plmmilaria, 

 although it is not recorded bv him. Dredged in 8 fathoms water in Bel- 

 fast Bay. Dublin Bay, 1834; Prof. Harvey. Youghal, :Miss Ball. Fine 

 specimens, from 4 to 6^ inches in height, dredged upon the same day 

 (June 15, 1842) in Red Bay, Co. Antrim ; and about Sana Island in 40 

 fathoms, on the neighbouring coast of Scotland, where very fine spe- 

 cimens were dredged by Mr. Hyndman. 



My specimens, w'ith vesicles and agreeing in all respects with Dr. J.'s 

 S. pinnata, except in three branches springing from each joint, I find is 

 perfectly identical with the fig.. Dr. Ellis, Coral., pi. xi. fig. A., in having 

 only one pinna springing from each joint. 



P. setacea, Lamx. 



Antrim and Down coasts, Clew Bay, Co. Mayo, W. T. Ballysodare 

 Bay, Co. Sligo, Mrs. Hancock. Glendore, Co. Cork, Prof. Allman. Spe- 

 cimens in Mr. Hyndman's collection, dredged at Donaghadec, July 12, 

 1842, are remarkably fine. They densely invest the stem and main 

 branches of a s])ccimen of Halidn/s siliqimsa, throughout about a foot of 

 its length, and from every plume throughout tlic mass issiics a scries of 

 vesicles closely placed together from the l)ase to near the summit ; these 

 vesicles generally, if not always, spring from the upper side of the stem. 

 Among Zoophytes given me by the late Archibald Menzies, Esq., were 



