NORTHUMBERLAND AND DURHAM. 133 



Order HELIANTHOIDA, Johnston. 

 Family. ACTINIAD^, Gray. 



22. ACTINIA, Linnceus. 



* Actinia, Gosse. 



1. A. mesembryanthemum, Ellis and Solander. 



Jolins. Brit. Zoopli., 210, t. xxxvi., f. 1 — 3.. 

 On rocks and stones between tide-marks ; common. 



* * Sagartia, Gosse. 



2. A. TROGLODYTES, JoIlUS. 



Jolins. Brit. Zoopli., 216, wood-cut 47. 

 In crevices of rocks between tide-marks ; not rare. Berwick 

 Bay. — Dr. Johnst07i. Cullercoats. — 3Ir. R. Howse. 



3. K. PELLUciDA, n. sp. 



Body cylindrical ; sub-conic or nearly flat when contracted, 



spreading at the base ; tentacles thirty or upwards, set in 



about three rows, the inside ones longest; the outer 



rather short; the whole animal pellucid white, without 



markings. Diameter J inch. 



On old crusted shells of Fusus antiquus from deep water, 



Cullercoats. — J. A. From the five-men boats. — Mr. E. 



Hoivse. 



This little Actinia, which is distinguished by the absence of 



all colour or markings, has occurred to me two or three times at 



Cullercoats, on old shells, nestling amongst the serpulse and 



barnacles with which they were covered. It is so inconspicuous, 



when contracted, as to elude observation, and it was not till the 



shells had been some time in sea-water, and the Actinia became 



expanded, that its presence was detected. A specimen kept in a 



vase was very restless, shifting its place continually, and often 



changing form. The species comes near to the A. Candida of 



Mr. Gosse, but, perhaps, nearer still to the A. j^allida, described 



in a recent number of the "Annals of Natural History," by Mr. 



Holds worth. The absence of the markings at the base of the 



tentacles, which appear to form a distinguishing character in these 



two species, has induced me to consider it distinct from either. 



