so furnished covered by a cribriform calcareous expansion, 

 others arched above, contracted below. Under surface of 

 zoarium marked with grooves. 



This definition applies almost exclusively to the only species 

 known to Mr. Busk. The cribriform calcareous expansion is 

 not present in the species described here, and the generic 

 character is confined to the fewness and irregularity of the 

 pores. 



Recent Species. 



Selenaria punctata, Spec. nov. 



PI. II., fig. 8a— 8c. 



Zoarium small orbicular or conical or roundly convex, some- 

 what thick, margins rounded thick, and almost flat, with open 

 cells in worn specimens, of a dull greyish colour. Upper 

 surface rough and spongy in appearance. Zoooecia ovate, 

 angular at the sides, arched above, flat or curved below ; but 

 the form varies. Surface flat, with a raised margin ; mouth 

 rather large at base of cell, flat above, curved below, with two, 

 rarely three, round pores above. Oooecium rather larger than 

 cells, ovate, rounded, adnate, punctured, opening above the 

 mouth of underlying cell. Vibracular areas rather larger than 

 mouth of cells, somewhat angular, with a raised margin. Under 

 surface of zoarium forming rounded, raised costae, with linear 

 grooves between, with a single or double row of punctures. 

 Some of these costae continuous to the concave summit ; others 

 intercalated between, which terminate at various lengths in 

 fine or obtuse points. These costae do not bifurcate, though 

 they have the appearance of doing so. 



Diameter of zoarium from six to seven millimetres ; altitude, 

 three to four. 



Dredged off Cape Three Points at 71 fathoms. 



The small cells and the double pores above the mouth are 

 sufficiently distinctive of the species, which is somewhat like 

 the fossil S. parvicella. 



Selenaria margestata, Spec. nov. 

 PL II., fig. 9a— 9d. 

 Zoarium small, irregularly orbicular, depressed, rather thin, 

 margins flattened for a long way, only concave near the 

 centre ; colour white, shining, upper surface rough and pitted. 

 Zoooecia hexagonal or sometimes rounded below, often appear- 

 ing as seen from above as if they overlapped like rounded 

 scales. Depressed concave, with distinct, raised margins, 

 covered with fine wart-like projections. Mouth large, quad- 

 rangular, with the angles rounded sometimes above and some- 



