312 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, sinuated 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. LEPRALIA AURICULATA, A. H. Hassatt. 



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 f 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." (Hassall.} 

 *** Vail of the cells punctured. 



15. LEPRALIA PERTUSA, W. Thompson. 



Hab. On rocks and old shells. On a Lima from the 



