BRITISH ZOOPHYTES. 167 



the intraseptal spaces. Tentacles perfectly retractile. 

 — GossE. 



This genus is provisionally placed by Professor 

 Hertwig amongst the Sagartidge. 



1. B. GEMMACEUS, E. and 8. " The Gem Pimplet." 

 Actinia gemmacea {E. and S., O. /., Cocks, B. Q. C, 



D.L., P.H.G.), A. verrucosa {Penn., Lamk., Rapp), 

 Cribrina verrucosa (Ehr.), Cereus gemmaceus {M. Ed- 

 wards), A. bimaculata (Grube). 



Hab. : Guernsey {Holdswortli), Torquay, Ilfracombe 

 {P.H. G.), Douglas (West). Height 1—2 in. 



Colour. Grey or flesh-coloured, with six equidistant 

 longitudinal bands of white primary warts. There are 

 secondary and tertiary rows of warts of a bluish or 

 reddish-grey colour, and a quarteruary row of indefi- 

 nite colour. Disc bluish-grey, with scarlet and blue 

 radial lines. Tentacles greyish with half a dozen well- 

 defined white spots. 



The tentacles number 48, as do the rows of warts, 

 each row of warts corresponding with a tentacle. 

 These warts are perforated, so that water can be ejected 

 through them. 



This species is easily kept in aquaria, and is very 

 prolific. 



2. B. THALLiA, Gosse. " The Glaucous Pimplet." 

 Cereus thalia {M. Edio.). 



Hab. : Ilfracombe (P. E. G.). Height 2 in. 



Colour. Bluish-green, with about 36 longitudinal 

 rows of dark-coloured warts, about 25 in each row. 

 Disc blackish with yellow radii alternately long and 

 short. Tentacles 48 in four rows, grey with numerous 

 white spots. 



Mr. Gosse describes two varieties — Xeroxyla, with a 



