NOTES ON THE HYDROIDS OF PLYMOUTH. 395 



Campanulina acuminata. Alder. 

 From trawlers. May, 1890. 



Familij LAFOEIDtE. 



Lafoea dumosa, Fleming. 



This species, var. rohusta, is not uncommon in twenty fathoms 

 near the Eddystone. 



Lafoea frdticosa, Sars. 



From Stoke Point and from trawl refuse near the Eddystone. 



Calycella sybinga, Linn. 



A very common species, growing profusely on roots of Laminaria. 



CUSPIDELLA COSTATA. 



Growing on weed, trawl refuse. May, 1890. 



Family HALECIID^. 



Haloikema, nov. gen. 



Generic Characters. — Stems erect, simple or sparingly branched, 

 ringed. Hydrothecae pedicillate, hydranths large, non-retractile. 



Haloikema Lankesterii, n. sp. PI. XXVI, figs. 1, 2. 



Shoots erect, springing from an interlacing creeping stolon, 

 composed of many distinct joints, simple or sparingly branched. 

 Hydrothecae alternate, sometimes borne on a short pedicel, one or a 

 pair separated by a variable number of joints, generally not more 

 than three, tubular, with a slightly everted rim. Hydranth very 

 large, elongated, fusiform, with a single circlet of sixteen to twenty 

 filiform tentacles, non-retractile. Hydranths and coenosarc of a 

 deep brown colour. Reproduction unknown. 



I have only obtained this species twice — near the Duke Rock 

 Buoy, May, 1889, and at the southern end of Jenny cliff Bay, May, 

 1890. I kept the last specimen alive for some weeks in the aquarium 

 in the hope of studying the reproduction, but all the specimens 

 eventually died without producing gonophores. 



This is a fine and very distinct species, easily recognisable from 



NEW SERIES. VOL. I, NO. IV. 30 



