52 



85. ALCYONIDIUM POLYOUM (Hassall). 



On the underside of stones in tide pools, Avith the last, frequent. 

 Alder (a). 



Some colonies of Alcyonidium on shells of Neptunea from 16 

 fathoms south-east of St. Mary's Island have been referred pro- 

 visionally to this species. There appear, however, to be many 

 intermediate forms between this species and A. mytili and A. 

 mamiUatum, differing according to age and the degree of contrac- 

 tion of the polypides. 



86. ALCYONIDIUM PARASITICUM (Fleming). 



On Plumularia falcata and other zoophytes from deepish water ; 

 common. Alder (a). 



From Stations III. and IX., and from 26 fathoms east of Blyth 

 (on Gemellaria), and 30 fathoms east of Cullercoats. 



87. ALCYONIDIUM GELATINOSUM (Linnaeus). 



Attached to old shells and stones in the Laminarian and Coral- 

 line zones ; frequent. On the sides of rocks at low-water mark, 

 Bamburgh. Alder (a), 



One specimen found in rock pool, Cullercoats. 



From Stations IV., V. and VIII. Small colonies measuring 

 not more than 2 inches. Numerous much-lobed colonies, some 

 measuring about 8 inches in length on a shell from 29-32 fathoms 

 east i south of the Tyne. 



88 ALCYONIDIUM ALBIDUM, Alder. 



Surrounding the stem of Plumularia falcata in small patches 

 from the deep-water fishing boats ; rare. Alder (a). 



Several colonies probably of this species have been dredged 

 from about 40 fathoms E. of Coquet Island. They invest various 

 species of hydroids, chiefly Tubularians. 



89. ALCYONIDIUM LINEARE, Hincks. 



On shells from deep water, Cullercoats ; not unfrequently. 

 Alder (b). 



