LEPRALIA, S17 
L. pediostoma, Iam not so well acquainted with it as with 
L. pediostoma, but I have specimens of it from Dr, Greville 
and Mrs. Gatty, and I can see no approximation except in 
the colour, and perhaps the size. L. pediostoma is stout 
and not easily injured; Z. verrucosa is thin and very friable. 
The former is punctured all over; the latter is areolated 
towards the base of the cells: the aperture of the former 
has a plain rim; the latter has a strong mucro on the upper 
lip. 
23. Lepratia RETICULATA, J. Macgillivray. 
Hab. On bivalve shells, deep water, rare. 
A fine specimen of this, the only one [ have seen, I had 
the honour of receiving from Lady Emma Campbell, of 
Argyle. It is on a beautiful Pecten striatus, dredged in 
Loch Fine. 
Nearly allied to Lepralia variolosa. 
24. LEPRALIA VARIOLOSA. 
Hab. On stones, and bivalve shells. 
This is spoken of by Mr. Peach as Proteus-like. The 
two varieties in Dr. Johnston’s plate lv. figs. 8 and 9, 
might almost be regarded as distinct species. It is very 
various in colouring also. It is described as yellowish, or 
dull greyish-white ; now I have a specimen of it from Dr. 
