164 



BRITISH MOLLUSKS. 



vol. 



5. Lymnsea truncatula. Truncate Lymncca. 



Shell ; acuminately ovate, distinctly umbflicated, rather solid, yel- 

 lowish horny, spire rather produced, 



whorls five to six, convex, truncate next 



the sutures, roughly and often densely 



striated in the direction of the lines of 



growth ; aperture rather small, ovate, 



columella callous, but little twisted, lip 



elongately expandedly reflected round 



the circumference of the umbilicus. 

 Buccinum truncattdiim, Muller (1774), Verm. 



Mist, part ii. p. 130. 

 Helix truncatula, Grmelin (1788), Syst. Nat. p. 



3659. 

 Buccinum fossarum, Studer (1789), Faun. Helv. Coxe, Trav. in Smitz 



iii. p. 433. 

 Bulimus truncatus, Bruguiere (1789), Enc. Meth. Vers, vol. i. p. 310. 

 Bulimus obscurus, Poiret (1801), Coq. de V Aisne, p. 35 (not of Dra- 



parnaud). 

 Limneus minidus, Draparnaud (1801), Tcibl. Moll. p. 51. 

 Helix fossaria, Montagu (1803), Test. Brit. p. 372. pi. xvi. f. 9. 

 Lymncea fossaria, Fleming (1814), JEdin. JEncyc. vol. vii. p. 77. 

 Limnceus truncatidus, Jeffreys (1830), Trans. Linn. Soc. vol. xvi. 

 Stagnicola minuta, Leach (1831), Turt. Man. p. 143. 

 LimnopJiysa minuta, Fitzinger (1833), Syst. Verz. p. 113. 

 Limnopliysa truncatula, Beck (1837), Ind. Moll. p. 112. 

 Limncea Doublieri, Requien(1845), Moq.-Tand. Hist. Moll. vol. ii. p. 474. 

 Lymnea ohlonga, Puton (1847), Moll, des Vosyes, p. 60. 

 Limncea microstoma, Droxiet (1852), Baudon, Moll, de VOise, p. 14. 

 Limnma ( LymnusJ truncatida, Moquin-Tanclon (1855), Hist. Moll. vol. ii. 



p. 473. pi. xxxiv. f. 21 to 24. 

 Hob. Throughout Europe. North Africa. Siberia. Afghanistan. (On 



the muddy margins of stagnant and slow running waters.) 



Lymncea truncatula, so named by Midler from the whorls of the 

 shell being rather truncate round the upper part next the sutures, 

 is a mud-dwelling species, plentifully diffused about the margin of 

 stagnant and gently running waters in all parts of Europe. Its 

 foreign distribution is similar to that of the preceding species, ex- 

 tending in addition into Afghanistan. It prefers to live out of the 

 water rather than in it, and is found at a considerable elevation 

 on the mountain. The animal of L. truncatula is of a rusty black, 



p. 377. 



