ST4 MOLLUSCA. PULMONIFERA. Limnea, 
Helix detrita, Pult, Dorst. 49. Mmt Test. Brit. 384, tab. xi. f. 1. 
In England and Ireland. 
Length fths of an inch ; lines of growth numerous, fine, with minute lon- 
gitudinal strije, sometimes plain or with one, two, or three brown bands ; 
whorls nearly flat ; aperture narrow ; pillar-lip reflected, forming a distinct 
cavity behind. Mr Bryer found this shell in a pool near Weymouth, and in 
a stream near Dorchester. Dr Turton adds, that it is found at Dublin. 
J udging from English and foreign specimens sent to me by the late Bev. 
J ames Lambert senior^ Fellow of Trinity College, Cambridge, I am inclined to 
consider the Helix detrita of Pultney, and the Bulimus radiatus of Drapernaud, 
as distinct species, the latter being a land shell. 
108. L. paliistl'is. — Shell brown; whorls six, tapering to a 
sharp point. 
Bucc. minus fuscum. List. An. Ang. 139. Conch, tab- 124. f. 24. — H. 
stagnalis, var. B., Penn. Brit, ZooL iv. 139. — H. pal. Mont. Test. Brit. 
370 , tab. xvi. £ 10 — H. fragilis et fontinalis, Don. Brit. Shells, tab. 175, 
f. 1, 2. — In ditches and swamps. Common. 
Length about fths of an inch, with numerous lines of growth, and longitu- 
dinal wrinkles ; whorls rounded ; peristome thickened, purplish. 
109. L. octona. — Whorls eight ; shell subcylindrical, pointed. 
Helix octona, Linn. Syst. i. 1248 — Bucc. glabrum. Mull. Verm. ii. 135, 
H. oct. Penn. Brit. Zool. iv. 138, tab. Ixxxvi. f. 135. Pult. Dorst. 49. 
— H. octanfracta, Mont. Test. Brit. 396, tab. xi. f. 8. — L. elongatus, 
Drap. Moll. 53 — In slow running ditches. 
Length fths, breadth of the body-whorl about |th of an inch; yellow- 
ish-brown ; whorls rather flat, striated across ; mouth narrow ; fold on the 
pillar elevated. Animal dusky ; foot short ; tentacula narrow, flat ; eyes at 
the internal base, in a shallow cavity, covered by a small protuberance, re- 
sembling the rudiments of tentacula. This seems a very local species. Mon- 
tagu found it in Cornwall ; and it has occurred to me in several ditches in the 
upper part of Linlithgowshire. The Physa scaturiginum of Drapernaud, 
(Moll. 56), and named as British by Dr Turton (Zool. Joum.N*. VIII, 565.) 
seems to be only the young of this species. 
110. L.fossaria. — Whorls five, rounded; pillar-lip broad, re- 
flected. 
H. foss. Mont. Test. Brit. 372, tab. x\d. f. 9. — In shallow muddy pools. 
Common. 
Length fths of an inch ; whorls increasing more rapidly than in the preced- 
ing ; striated across, and wrinkled longitudinally ; separating line deep ; mouth 
wide ; lip, in descending on the pillar, broad and reflected, exhibiting the 
oblique fold very indistinctly — This is probably the Turbo striatus quatuor 
anfractibus apertura ovali marginata of Walker., Test. Min. tab. ii. f. 57, called 
T. rivulus, by Montagu., and Limnea minuta by Drap. Moll. 53. — This spe- 
cies and the L. octona frequently creep out of the water, and remain for some 
time in a quiescent state. 
Shell ventricose. 
111. L. limosa. — Whorls five; the first four rounded; mouth 
slightly contracted. 
H. lim. Linn. Syst. i. 1249.— Bucc. peregrum. Mull. Verm. ii. 130 — H. 
putris, Penn. Brit. Zool. iv. 139, tab. Ixxxvi. f. 137 — H. peregra, 
