324 HISTORY OF BRITISH ZOOPHYTES. 
pretty easily distinguished, though it assumes some variety 
of forms. The cells are ovato-globose, frosted ; the aperture 
sub-circular, with from three to seven spines, those-in the 
middle being long, and those at the sides short. There are 
no spines on the upper lip, but there is a knob above it. 
The L. insignis of Hassall, besides the spines on the upper 
lip, has a single spine arising from the side. I remember 
that he was pleased when I sent him specimens of it from 
our Ayrshire coast, where it is pretty common. It is smaller 
and neater, but Dr. Johnston thinks it is only a variety of 
the normal state. 
33. LEPRALIA SPINIFERA, 4. H. Hassall. 
Hab. Rather abundant on stones and shells, in Dublin 
Bay, A. H. Hassall. 
This differs from JL. ciliata scarcely in anything except 
that it has a sinus in the upper lip. 
34. LepRaLia TRISPINOSA, Dr. Johnston. 
Hab. On shells, Berwick Bay, rare, Dr. Johnston; coast 
of Cornwall, Mr. Peach; near Aberdeen, on roots of Lami- 
naria digitata, J. Macgillivray. 
Crust often silvery white, with minute yellow dots; cells 
rough; aperture a little cleft above, having three stout long 
spines on the under lip. 
