276 NATURAL HISTORY OP 



8. L. POLITA, Norman. 



Shetland {A. M. N.). 



This species forms pinkish- coloured colonies in deep 

 water. The surface of the zooecia is smooth and 

 polished. The orifice is long and arched, with a straight 

 margin and much-developed peristome. 



Genus II. Umbonula, HincTcs. 



Zooecia with the primary orifice suborbicular or sub- 

 quandrangular, lower margin slightly curved inwards ; 

 peristome not elevated, no secondary orifice ; a promi- 

 nent umbo (? avicularian cell) immediately below the 

 mouth, supporting an avicularium. Zoarium (in the 

 British species) incrusting. — T. H. 



1. U. VEEEUCOSA, Esper. 



? Cellepora verrucosa (Esper), Lepralia verrucosa 

 [Thompson, G. J., Alder, D. L., Bush, McA., Heller), 

 Discopora verrucosa (Gray). 



Hab. : Devon, Cornwall, Guernsey (T. H.), Scar- 

 borough (^eaw), Northumberland [Alder), St. Andrews 

 [McL), Wick [G. W. P.), Scotland (D. L.), Shetland 

 [A.M.K). 



This species forms incrusting colonies of a rose-red 

 colour. The cells are very thin and friable, except 

 when occurring in deep water. The cells are convex, 

 having a distinct umbo just below the orifice. From 

 this umbo ridges radiate to the margin of the cell. 

 There is usually an avicularium below the umbo. 



These characteristics are all intensified in the deep- 

 water varieties, in which also the ovicels are prominent, 

 and decorated with punctures and spines so as to form 

 a " very handsome crest.;" 



