LIMN^US. 
211 
In marshes and ditches, on the mud. 
Animal greyish or dusky. 
Shell half an inch long, pale brown or greyish, 
and is readily distinguished from the last by the 
rounded and deeply divided volutions ; aperture 
nearly half as long as the shell, the outer lip a little 
reflected, but not spread nor glossy. 
95. 6. Limn^us glaher. Eight-whorled Mud Shell. 
— Shell elongated, oblong-cylindrical, tapering, 
brittle, pellucid, yellowish white, with seven 
or eight convex volutions, and the aperture 
elongate-ovate, (t. 9. f. 106.) 
Helix octona. Penn, B. Z, ii. t. 86. f. 135. — Helix octan- 
fracta. Mont, p. 396. 588. t. 11. f. 8. — Limneus elongatus. 
Drap, p. 52. t. 3. f. 3, 4. (bad); Alder,^ 1. c. 115.; Turton^ 
Man, ed. 1. 122. f. 106. — Limnea elongata. Sowerhy,^ Gen, 
f. 6. — Limnseus elongatus. Rossm, Icon, i. 101. t. 2. f, 58. 
— Stagnicola octanfracta. Leach^ Syn, Moll, 102.— -Helix 
peregrina. Dillwyn^ p. 954. — Buccinum glabrum. Milller^ 
Verm. ii. 135. (?) — Ljmnea elongata. Flem, E . Ency . \i\, 
78. — Limnea octona. Flem. B. A. 274. — Limneus glaber. 
Gray. Man. 243. t. 9. f. 106,; Forbes and Hanley,^ B. M. iv. 
178. t. 124. f. 1. — Lymnea elongata. Nilson^ Moll. 7,-~ 
Limneus subulatus. Kickx, Syn. 60. f. 13, 14. — Limnaea 
variabilis. Mill. Moll. Main. 51. — Ompbiscola glabra. Beck., 
Ind. 310. — Leptolymnea elongata. Swains. Moll. — 
Limnma glabra. Moq. Tand. M. F. ii. 478. t. 34. f. 36, 37. 
Monstrosity, the outer lip with a thick white internal rib : 
Lymnaea leucostoma. Lamarck^ vi. ii. p. 162. — Bulimus 
leucostoma. Poiret., Prod. 37. 
Var. 1., spire elongate, twisted. 
Yar. 2., apex of spire truncated or decollated. 
In stagnant waters. 
Animal blackish or dusky. 
Shell an inch long, regularly tapering, with the 
ultimate volution not larger in proportion than the 
rest ; spire composed of seven or eight tumid volu- 
