ep ed HISTORY OF BRITISH ZOOPHYTES. 
see it in the British Museum, where Dr. Johnston’s col- 
lection of zoophytes is deposited, but the day was dark, 
and the attempt unsuccessful. It is well figured, however, 
in Dr. Johnston’s plate liv. fig. 9, and well described as 
follows :—“ Polypidom forming a thin, white, and closely 
adherent circular crust of the size of a wafer: the cells 
rather large, horizontal, continuous, ovate, semi-alternate, 
with the walls thin, glossy, and hyaline, thickly dotted 
with perforated granules ; the aperture somewhat prominent, 
oblique, patulous, unarmed, circular, smuated on the proxi- 
mal side, and in the centre of this sinus there is usually a 
small mucro.” By a letter from Mr. Peach I learn that 
he has found it at Peterhead. 
14, Lepratia aurtcuLata, 4. H. Hassall. 
Hab. On shells. Trawled off Bray, and found on oyster- 
shells, coast of Norfolk, A. H. Hassall; on a valve of Pecten 
maximus, off Scilly, Mr. M‘Andrew. 
‘Cells coalescent, short, rhomboidal, bounded by a fine 
and very distinct line; the aperture small, circular, plain, 
with an arched sinus on the proximal side.” (Hassad/.) 
*k* Wall of the cells punctured, 
15. Lepraria pertusA, VW. Thompson. 
Hab, On rocks and old shells. On a Zima from the 
