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or 
LEPRALIA. 
35. Lepratia mmersa, Dr. Johnston. 
Hab. On shells and stones from deep water. 
The crust is rough, the aperture small, with a blunt 
tooth on the upper lip; the surface minutely granular. Dr. 
Johnston says it differs from JL. cidiata in having a more 
solid texture; in forming larger patches; in the much less 
distinctness of the cells; in the aperture having no rim, 
but a slight projection in the upper margin; and in there 
being no knob behind it. It is not uncommon on the west 
coast. I have specimens of it, from Tiree, on Pinna ingens. 
36. Lepratia viotacea, Professor Forbes. 
Hab. On Nullipores, from the Isle of Man, E. Forbes; 
coast of Cornwall, Mr. Peach; Dr. Greville. 
“This species is nearly allied to the latter, and the most 
distinguishing characteristic may be the purple colour of 
the crust, which is quite peculiar to it.” 
37. LEPRALIA BISPINOSA. 
Hab. On Modiola vulgaris, Berwick Bay, Dr. Johnston. 
Dr. Johnston states that this species bears a very close 
resemblance to Cellipora pumicosa. By his figure of it 
however (plate lv. fig. 10), it seems sufficiently distin- 
guished from it by the very long spines which originate 
from the angles of the lower lip. 
