LEPRALIA. 313 
Isle of Man, Prof. E. Forbes ; Cornwall, Mr. Peach ; dredged 
off Sana, Mr. Hyndman. 
“Cells ovato-ventricose, punctured, distinct, with a some- 
what circular aperture, the margin of which is plain and 
even.” (W. Thompson.) The only specimen I have seen of 
this, I had from Mr. Busk, Greenwich. 
16. Lepratia punctata, W. Bean. 
Hab. On rocks, and sometimes on shells between tide- 
marks. 
Crust thin, greyish when old; the young cells are whitish, 
and I have a specimen on an old shell, in which the young 
white cells are surmounting the old grey crust. It is very 
common on slaty rock at Saltcoats and at Whiting Bay, 
Arran. I have never observed denticles on either the upper 
or the under lip. On some specimens I have, the lips are 
both thickened, and there is a round tubercle under the 
inferior lip. In other specimens there is a little sharp loop 
on each side of the aperture. The tubercles are said to be 
young ovaries. This pretty species comes very close on 
some of its neighbours, and it requires considerable powers 
of discrimination to discern the distinctions. 
17, Leprawia annutata, D.L. (Plate XVIII. fig. 68.) 
Hab. On the fronds of Laminaria saccharina, common 
