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 ; apertm-e 

 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. 

 Drop. 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. — Limnajus elongatus. Rossm. Icon. i. 101. t. 2. f. 58. 

 — Stagnicola octanfracta. Leach, Syn. Moll. 102. — Helix 

 peregrina. Dillwyn, p. 954. — Buccinum glabruin. Millie?', 

 Verm. ii. 135. (?) — Lymnea 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. — Lvmnea elongata. Nilson, Moll. 7.— 

 Limneus subulatus. Kickx, Syn. 60. f. 13, 14. — Limnaea 

 variabilis. Mdl. Moll. 3Iain. 51. — Omphiscola glabra. Beck, 

 Lid. 310. — Leptolymnea elongata. Swains. Moll. 338. — 

 Limnasa glabra. Moq. Tand. M. F. ii. 478. t. 34. f. 36, 37. 



Monstrosity, the outer lip with a thick white internal rib : 

 Lymnaja leucostoraa. Lamarck, vi. ii. p. 162. — Bulimus 

 leucostoma. Poiret, Prod. 37. 



Var. 1., spire elongate, twisted. 



Var. 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- 



P 2 



