LEPRALIA. 317 



L. pediostoma. I am 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 ; L. verrncosa 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. LEPEALIA RETICULATA, /. Macgillivray. 

 Hab. On bivalve shells, deep water, rare. 



A fine specimen of this, the only one I have seen, I had 

 the honour of receiving from Lady Emma Campbell, of 

 Argyle. It is on a beautiful Pecten striatus, dredged in 

 Loch Pine. 



Nearly allied to Lepralia variolosa. 



24. LEPEALIA 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 Iv. 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. 



