32 LIMACID-. 
drab-coloured variety is the form commonly met with in 
England. 
Var. I. plimbea (Mog.). Lead colour, darker above. 
Var. Il. zvéva (Williams). Drab-brown colour. 
2. <A. SOWERBYI (after Sowerby) Férussac. Pl. I., f. 10. 
[=L. MARGINATUS Jeffreys. ] 
Body a warm brown colour, darker above ; wzast/e marked with a 
groove in the shape of a horse-shoe, but with three angles like a 
truncated diamond, the fourth angle of the diamond being cut off by 
hinder edge of the mantle. The ody and mantle speckled with 
the black ; she// often very thick; ee/ very pronounced, extending the 
whole length of the back from mantle to posterior extremity ; /vot- 
sole yellowish ; sme sticky ; dength 24 inches. 
This is also a somewhat local species, but has a 
slightly wider range than the last. 
It may be pointed out that a transverse section ot 
this slug, just behind the mantle resembles a bracket 
(——), while a similar section of gagades is in the form of 
a circumflex accent (A). 
I am not certain if the angles of the “trumested 
diamond’ can always be observed, as Dr. Scharff says 
that in Irish examples the marking in question is often 
faint. The same author points out that the colour of 
sowerbyt “is always brown or a. bright yellow-brown, 
while in the variety [ava] of A. gagates it is always a 
light drab brown. Both species may be distinguished 
merely by the touch. Whilst 4. cavtnata |i.e. sowerbyi| 
feels like a sticky lump of fat, 4. gagates, owing to its 
