BRITISH ZOOPHYTES. 261 



below the other. The ovicels are marked with de- 

 pressed lines extending radially from the margin 

 towards the centre. 



3. S. Albert, Biish. 



Alysidota Alderi (Bush, A. M. N.), Lepralia Barleei 

 {Busk, McA.). 



Hab. : Shetland {A. M. N.). 



This is a deep-water species. The zooecia are oval, 

 with a small aperture, below which is a boss or tubercle. 

 The surface of the cell is dotted, and there is a row of 

 distinct punctures round the margin. The cells are 

 sometimes massed together, at others they extend in 

 a linear series. 



4. S. VULGARIS, Moll. 



Eschara vulgaris (Moll.), Escharina vulgaris [Lamk.), 

 Cellepora vulgaris [Lamx.), Lepralia vulgaris [Busk, 

 T. H.), L. alba (T. 7J.), Cellepora othopora {Reiiss), 

 L. othopora and L. intermedia {Reuss). 



Hab. : Hastings {Miss Jelly), Birterbuy Bay {A.M.N.) . 



The cells are oval with a semicircular orifice, the 

 lower margin of which is straight, with a notch in the 

 centre. There are 3 — 4 spines on the upper margin 

 of the orifice, and two long jointed spines on each side 

 of the face of the cell about the centre. There is 

 occasionally an umbo or boss below the orifice. 



5. S. JoHNSTONi, Johnston. 



Lepralia simplex {G.J., D. L., T. E., McA., Gray., Busk) , 

 S. simplex (T. IT.). 



Hab. : Off Sana Island {Hyndman), South Devon 

 {T. H.), Hebrides (A. M. N.), Hastings {Miss Jelly). 



The cells are elongately oval, with a collar-like 

 margin round the orifice, below which is an umbo. 

 The ovicels are ornamented with two or three bosses. 



