53 



90. ARACHNIDIUM FIBROSUM ? Arachnidium Hppotho- 

 oides Hincbs. Plate II., figs. 2, 2a. 



The species described by Alder (b) as A. hippothooides has been 

 split up by Hincks in the " British Marine Polyzoa " into the two 

 species A.fibrosum and A. hippothooides. 



On the tests of Ascidise, shells, Sec, from deep water, Culler- 

 coats. Alder. 



I have found a species resembling this both on Ascidia sordid a 

 (from 34-37 fathoms between the Tyne and Newbiggin), and on a 

 shell of Neptunea from 29^ fathoms east of Blyth. 



In each case the colony consisted in part of a large number of 

 cells massed together, surrounded by a network of cells joined by 

 anastomosing fibres. Specimens have been sent to Dr. Harmer, 

 who thinks that although differing considerably from Hincks' 

 figure, they are to be referred to this species. 



91.* ARACHNIDIUM CLAVATUM, Hincks. 



On the test of Ascidia sordida from 40 fathoms east of Coquet 

 Island. The only previously recorded British locality for this 

 species is Shetland. There is no massing together of the cells in 

 the colonies of this species. 



92. FLUSTRELLA HISPIDA (Fabricius). 



On Fucus serratus and other seaweeds between tide marks, and 

 occasionally on stones ; common. Alder (a). 



Very abundant between tide marks, Cullercoats. 



93. VESICULARIA SPINOSA (Linmeus). 

 Cullercoats, a single specimen. Alder (a). 



94. AMATHIA LENDIGERA (Linmeus). Serialaria lendigera 



(Linn.). 

 On Fuci and zoophytes from low-water mark to deep water, 

 not rare. Alder (a). 



95. BOWERBANKIA IMBRICATA (Adams) var. DENSA 



Farre. 



In tide pools, on Corallina officinalis ; frequent. Alder (a). 



In addition to the above habitat, I have found this variety 

 covering stones in the aquarium tanks very thickly. It has been 

 dredged from Stations III. and IV., growing in dense masses on 

 the fronds of Flustra foliacea. 



