LEPRALIA. 305 
breadth. When young, they are pellucid and smooth. 
The capsules are projected in front of the constricted aper- 
ture, and are perforated on the top. The cells are sur- 
rounded with a series of apertures, 
3. Lepraia assimitis, A. H. Hassall. 
Hab. Dublin Bay, Hassall. 
Though this resembles L. ¢tenwis, Mr. Hassall thinks it 
is distinct. Dr. Johnston, judging from Mr. Hassall’s de- 
scription, can see no characteristic difference betwixt them. 
Four specimens of it were got by Mr. Hassall on Pecten 
MAXIMUS. 
4. Lepraia Hassatriu, 4. H. Hassall. 
Hab. On shells, rare. Dublin Bay? A. H. Hassall; on 
Patella cerulea, coast of Ayrshire, D. L. 
We remember finding this, many years ago, adorning the 
summit of a P. ce@rulea, cast out on the shore at Saltcoats. 
It was new to me, and I sent it to Dr. Johnston, who was 
then preparing for the press the first edition of his ‘ History.’ 
He received it afterwards from Mr. Hassall. It is com- 
posed of large cells, horizontal and cylindrical. The aper- 
ture is wide, with a small sinus above and a large knob on each 
side. The capsule, situated below the aperture, “ mimics 
the swollen lobe of the flower of a calceolaria.” (Johnston.) 
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