394 NOTES ON THE HYDROIDS OF PLYMOUTH. 



Tdbularia bellis, Allman. 



Gi'owing in profusion on stones at extreme low-water mark, north 

 side of Breakwater, May, June, and July, 1890. 



CORYMORPHA NUTANS, Sars. 



Five specimens of this species were taken by Mr. Heape in Whit- 

 sand Bay in about three fathoms, below Fort Tregantle, on May 

 17th, 1887. Though we have dredged constantly in the same 

 locality, we have never succeeded in obtaining another specimen. 



Galyptoblastea. 



Family CAMPANULARIID^. 

 Clytia Johnstoni, Alder. 



Ubiquitous on algas and on other hydroids. 



Obelia geniculata, Linn. 



Very common, growing preferably on Laminaria. It has appeared 

 in the aquarium, and covers many of the standpipes and gratings 

 where there is a steady and continuous current. 



Obelia dichotoma, Linn. 



Attached to worm tubes, Whitsand Bay ; and from trawl refuse 

 near the Eddystone. 



Obelia longissima, Pallas. 



From trawl refuse outside the Eddystone. 



Campandlaria yolubilis, Linn. 

 From shells, Duke Rock Buoy, 



Campanularia raridentata. Alder. 

 On weeds, trawl refuse. May, 1890. 



Campanularia flexuosa, HincTcs. 



Very common in rock pools beneath the Hoe, and on weeds. 



Campanularia angulata, Hinchs. 



From the shore, Bovisand Bay, July 27th, 1889. 



