Involute.] 



MOLLUSCA. 



29 



4. Lvmn^a elongata, pi. XV, f. 1,2, 3, and 5 First 



Ed, pi. 42, f. 1,2, 3, and 5. 



Lymneus elongatus, Drapernaud, p. 52, pi. 3, f. 3, 4; Turton, 

 Man., p. 122, f. 106 ; Alder, Mag. Zool. and Bot., II, p. 1 15 ; 

 Lymncea leucostoma, Lamarck, An. San. Vert., VI, pt. 2nd, p. 

 162; Lymnceus elongatus, Rossmassler, Icon., I, p. 101, pi. 2, f. 

 58; Limnea elongata, Sowerby, Genera, f. 6; Limneus glaber, 

 Thompson, Ann. and Mag. Nat. Hist., VI, p. 32 ; Helix octan- 

 fracta, Montagu, Test. Brit., p. 396 and 588, pi. 11, f. 8; 

 Brown, Ency. Brit., VI, p. 461 ; Helix octona, Pennant, Brit. 

 Zool., IV, p. 138, pi. 8, f. 139; Helix perigrina, Dillwyn, Des. 

 Cat., p. 954; Stagnicola octanfracta, Leach, Moll., p. 141. 



Shell horn-coloured, smooth, pellucid, greatly elongated ; 

 body not half the length of the shell; spire long, tapering, con- 

 sisting of seven or eight slender, gradually diminishing, some- 

 what cylindrical volutions, terminating in an acute apex, these 

 are very slightly wrinkled longitudinally, and the lower volutions 

 sometimes obscurely striated transversely; aperture oblong, not 

 a third the length of the spire; outer lip thin; inner lip white, 

 and slightly reflected on the columella. 



This species is subject to variety, both in size and form, as 

 will be seen by a reference to our figures ; in some the spire 

 terminates in a decollated apex. It also varies in the number 

 of its volutions. 



Section II. — Subovate ; body ventricose ; aperture longer 

 than the spire. 



5. Lymnjea auricularia, pi. XV, f. 29, 30, 31, 32.— First 

 Ed., pi. 42, f. 29, 30,31, 32. 



Lymncea auricularia, Lamarck, An. San. Vert., VI, pt. 2nd, 

 p. 161 ; Lymneus auricularis, Brard, p. 140, pi. 5, f . 2 ; Tur- 

 ton, Man., p. 117, f. 100; Limnceus auricularis, Pfeiffer, p. 85, 

 pi. 4, f. 17, 18 ; Limneus auricularis, Drapernaud, p. 49, pi. 2, 

 f. 28, 29, and 32 ; Rossmassler, Icon., I, p. 98, pi. 2, f. 55 ; 

 Jeffreys, Linn. Tr., XVI, p. 372 ; Alder, Mag. Zool. and Bot., 

 II, p. 115; Thompson, Ann. and Mag. Nat. Hist., VI, p. 29; 

 Helix auricularia, Linnaeus, Syst. Nat., p. 1250; Pennant, Brit. 

 Zool., IV, p. 138; Donovan, Brit. Sh., pi. 51, f. 1 ; Montagu, 

 Test. Brit., p. 375, pi. 16, f. 2, and p. 381, pL 16, f. 1 ; Helix 

 limosa, Fleming, Brit. An., p. 275 ; Brown, Wernerian Mem., 

 II, p. 531 ; lb., Ency. Brit., VI, p. 461 ; Radix auriculatus, 

 De Montfort, II, p. 207; Gulnaria auricularia, Leach, Moll., 

 p. 148; Buccinum auricula, Miiller, Verm., II, p. 126. 



Shell slightly ovate, thin, brittle, subpellucid, of a pale yel- 

 lowish horn colour ; body very large, ventricose, and slightly 

 wrinkled longitudinally; spire very short, consisting of three or 

 four well defined volutions, terminating in an acute apex; aper- 

 ture oblong-ovate, extremely wide, and large; outer lip greatly 

 extended, and somewhat reflected at the margin ; pillar lip 

 smooth, broadly reflected on the columella, with a strong fold 

 towards its lower part, and forming a slight umbilicus behind. 



Found in the river Avon, the Kennet, Berkshire ; and in a 

 ditch at Clonooney, King's County, Ireland. 



6. Lymnsa peregra, pi. XV, f. 8, 9, 10, 11, 36, 37, 38, 

 39, 40— First Ed., pi. 42, f. 8, 9, 10, 11, 36, 37, 38, 39, 40. 



himncea peregra, Lamarck, An. San. Vert., VI, pt. 2nd, p. 

 161 ; Limnceus pereger, Pfeiffer, p. 90, pi. 4, f. 23, 24 ; Lim- 

 neus pereger, Drapernaud, p. 50, pi. 2, f. 34 and 37 ; Turton, 

 Man., p. 118, f. 101 ; Jeffreys, Linn. Tr., XVI, p. 374 ; Alder, 



Mag. Zool. and Bot., II, p. 115; Thompson, Ann. and Mag. 

 Nat. Hist., VI, p. 30 ; Lymncea putris, Fleming, Edin. Ency., 

 VII, p. 77; Lymncea limosa, Fleming, Brit. An., p. 274; Helix 

 peregra, Gmelin, Linn. Syst. Nat., p. 3659; Montagu, Test. 

 Brit., p. 373, pi. 16, f. 3; Helix putris, Pennant, Brit. Zool., 

 pi. 86, f. 137; Brown, Wernerian Mem., II, p. 530; lb., Ency. 

 Brit., VI, p. 461 ; Helix limosa, Brown, Wernerian Mem., II, 

 p. 530 ; Buccinum peregrum, Miiller, Verm., II, p. 1 34 ; Gul- 

 naria peregera, Leach, Moll., p. 146. 



Variety 1. Ovate, aperture more dilated, pi. XV, f. 8, 9, 

 10, 11— Limncea ovata, First Ed. pi. 42, f. 8, 9, 10, 11. 



Lymncea ovata, Lamarck, VI, II, p. 121 ; Kenyon, Mag. 

 Nat. Hist., II, p. 425, f. g ; Lymnceus ovatus, Pfeiffer, p. 89, 

 pi. 4, f. 21 ; Limneus ovatus, Drapernaud, p. 50, pi. 2, f. 30, 

 31 ; Lymneus ovatus, Brard, p. 142, pi. 5, f. 4, 5 ; Lymnceus 

 ovatus, Rossmassler, Icon., I, p. 100, pi. 2, f. 56; Limnea lineata, 

 Bean, Mag. Nat. Hist., VII, p. 493, f. 62. 



Variety 2. Outer lip expanded, and with an internal rib. 

 pi. XV, f. 37. 



Helix auricularia, var., Maton and Racket, Linn. Tr., VIII, 

 p. 218, pi. 5, f. 8*; Lymnea marginata, Michaud, Compl., p. 

 88, pi. 16, f. 15, 16. 



Variety 3. Shell small, stronger ; spire but slightly pro- 

 duced ; the outer lip not attenuated, pi. XV, f. 50, 51, and pi. 



XVIII, f. 17, 18 First Ed., pi. 46, f. 50, 51. 



Helix lutea, Montagu, Test. Brit., p. 380, pi. 16, f. 6; Maton 

 and Racket, Linn. Tr., VIII, p. 222. 

 Variety 4. Spire acute, and tapering. 

 Lymneus acutus, Jeffreys, Linn. Tr., XVI, p. 373. 

 Variety 5. With the volutions reversed. 

 Limnea lineata, Bean, 1. c. ; Sturm, pi. 39- 

 Shell ovate, thin, subpellucid, yellowish horn-coloured, slightly 

 wrinkled longitudinally; body very tumid, and large; spire very 

 short, consisting of three or four rapidly decreasing volutions, 

 terminating in a sharp apex ; aperture very large, oval, about 

 three-fourths the length of the shell ; outer lip thin ; inner li|> 

 broadly reflected on the columella. 



This species is subject to considerable variety, both in form 

 and size; and is plentifully diffused in almost all ditches, ponds, 

 and lakes. 



We found variety 2, of the large size, figured in pi. XV, f. 

 10, 11, in ditches at Bury, Lancashire. 

 7. Lymncea involuta, pi. XVIII, f. 5. 

 Limneus involutus, Harvey; Alder, Mag. Zool. and Bot., II, 

 p. 115; Thompson, Ann. and Mag. Nat. Hist., VI, p. 31. 



Shell very thin, pellucid, shining, rendering the columella visi- 

 ble throughout its whole length; colour, pale amber; body very 

 large, enveloping the spire, and provided with coarse, longitudi- 

 nal striae ; spire very short, sunk, truncated at the apex, and 

 sometimes concave, consisting of three volutions, none of which 

 are visible in the profile of the shell ; aperture very large, wide 

 at the base, and extending to the apex ; margin reflected only 

 where it joins the pillar. Length five lines and a half; breadth 

 three lines and a half. 



Its general aspect is not unlike Akera flexilis, in consequence 

 of the aperture extending to the apex, and the appearance of 

 the columella. 



This interesting and new species was discovered by William 

 Henry Harvey, Esq., of Limerick, in a small alpine lake on the 



