LIMNiEUS. 183 



f. 11, 12. — Michaud, Suppl. Drap. Moll. France, pi. 16, 

 f. 13, 14. — Mem. Acad. Brux. vol. xi. — Gras, Moll. Ter. 

 et Fluv. France, p. 18. 

 Ampliipeplea glutinosa, Nils. Moll. Suec. Ter. et Fluv. p. 53. — Gray, Manual 

 L. and F. W. Shells, p. 243, pi. 9, f. 103.— Brown, 

 Illust. Conch. G. B. p. 30, pi. 15,f.27, 23.— Bossmassl. 

 Iconog. Land und Siissw. Moll. pt. 1, p. 93, f. 48. — 

 Stein, Schnecken Berlins, pi. 2, f. !J. 

 Limnea „ Sowerbv, Genera, Shells, Lim. f. 5. — Fleming, Brit. 



Animals, p. 275. — Desm. Bull. Linn. Bord. vol. vii. 

 p. 142, pi. 1, a. — Beeve, Conch. Syst. vol. ii. p. 191, 

 f. 5. — Mermet, Moll. Pyren. p. 6'5. 

 Lymnea „ Desh. Lam. Anim. s. Vert. (ed. Desh.) vol. viii. p. 419. 



Shell suborbicular, or globosely oval, so thin as to be 

 almost membranaceous, quite transparent, highly polished, 

 of an uniform very pale amber, or yellowish horn- colour, 

 finely wrinkled lengthways. Body composing nearly the 

 entire shell, much inflated, swelling out convexly from the 

 somewhat sunken suture ; basal declination rounded, and 

 rather quick. Spire scarcely elevated, extremely small, 

 formed of three moderately rounded, though depressed and 

 tapering volutions, whose increase is moderately fast ; 

 base of the penult whorl very small ; apical turn minute 

 and very blunt. Mouth capacious, extending almost the 

 whole length, and filling from four-sevenths to two-thirds 

 of the ventral surface, ovate acute, being well rounded 

 below, and rather suddenly contracted above by the swell 

 of the body. Outer lip neither expanded, nor much reced- 

 ing below, not sinuated at the margin, simply arched 

 throughout, and forming along with the regularly arcuated 

 left edge of the broad but thinly spread enamel of the inner 

 lip, a rounded ovate figure ; pillar lip narrow, arching to the 

 right anteriorly ; columellar twist only faint : no umbilical 

 crevice. Length rather more than half an inch ; breadth, 

 three-eighths of an inch. 



The animal is remarkable for its large mantle lobes, of a 



