PISIDIUM. 159 
flatter beaks, distinguish it from the last species. The 
variety grandis was found by Mr. T. Rogers near Man- 
chester, and was named for him by Mr. W. W. Walpole. 
Some specimens that Mr. Rogers kindly gave me measure 
6 mm. in breadth, but he informs me that he has taken 
even larger examples. 
Var. I. obtusdlis (Lam.). Smaller and more tumid. 
Wan Ul. erandis (1. £. Ad.).. Much larger. L.-5 mm, 
je is aanvaae 
4. P. NfiripuM (shining) Jenyns. Pl. IX., f. 8, and Pl. X., f. 2. 
Round, tumid above, compressed below, very glossy ; scavs distinct. 
3 3 
hogs mm:, (RB. 34 mm. 
Though this species is recorded as having a wide 
distribution, it is rare. Very few collectors seem able to 
identify it. Typical specimens of this and other mem- 
bers of the genus are easily distinguished, but the many 
variations of form so commonly met with render identifi- 
cation extremely difficult, especially as many collectors of 
experience call the same thing by different names. I 
think it is most apt to be confounded with pyse//um and 
its var. obtusale. 
It is recorded for most parts of Great Britain and 
Ireland. The variety g/odosa was named so by Jeffreys 
in a letter to Mr. T. Rogers. Some specimens of this 
var. on being subjected to a continental authority were 
considered to be P. obtusale. 
