| of the Land and Fresh-water Shells of Suffolk. 155 
muscorum the margin is broad and reflexed, and the tooth is long, 
obliquely directed from right to left, and is on a level with it. 
These shells are also found in very different situations; T.mus- 
corum inhabits moss upon the bark of trees in shady and moist 
places ; T. marginatus, on the contrary, is only found in dry pas- 
tures and the most open places. The young much resemble Trochi. 
Notuncommon under stones and sticks in Little Blakenham : 
and within the bounds of Ipswich, not far from the Red- House, 
as you go towards Westerfield by the fields. Specimens found 
in the above situations never exceeded 1+ lin. in length, and 
had 6 volutions, answering exactly to the Pupa marginata of 
Draparnaud. 
I have since found the same species at Shotley, at the roots of 
. grass on the marsh within the Sea Wall; and in profusion in 
Essex, near Wrabness point, on the upper part of the marsh ; 
a situation which at high spring-tides is covered with water. 
These latter shells were 12 lin. in length, and had 7 volutions. 
Some of them were without the white band or hood above the 
margin, which is probably attained by age; and one specimen 
had the aperture rather sloped towards the base, and the umbili- 
cal cleft of course oblique; such a variety answers well to the 
Pupa umbilicata of Draparnaud, which is probably, therefore, 
only a variety of T. marginatus. 
The same species has been found on the summit of Harwich 
cliff. 
24. TURBO OFFTONENSIS. 
T. testa fusca striata subpellucida, anfractibus septem secundis 
sensim minoribus, apertura rotundatà edentulà nec mar- 
ginata. 
Habitat super gramina et arbusta in sylvis, super truncos arbo- 
rum, atque inter folia putrescentia. 
Testa plusquam 14+ lin. Angustior quam T. muscorum et T. mar- 
x 2 ginatus, 
