MOLLUSCA. 



[Trachelipoda 



mountain of Cromaglaun, near the lakes of Killarncy, Ireland. 

 In liis cabinet, and those of William Thompson, Esq., Mr. 

 Hyndman, and Dr. Drummond of Belfast, and Robert Ball, 

 Esq., Dublin. 



Genus 38. — Amphipeplea. — Nilson. 

 Shell subovate, nearly globular, very thin, membranaceous, 

 anil flexible; body extremely large; spire very small, and sub- 

 acute; outer lip not continuous, slightly inflated above, and 

 acute at the base; pillar lip provided with a single plait, or 

 twist, and a little reflected on the base of the columella. 



1. Amphipeplea glutinosa, pi. XV, f. 27, 28 — First 

 Ed., pi. 42, f. 27, 28. 



Amphipeplea glutinosa, Nilson, Moll. Sacc, p. 58; Rossmass- 

 ler, Icon., I, p. 93, pi. 2, f. 48; Limneus glutinosus, Drapernaud, 

 p. 50; Turton, Man., p. 120, f. 103; Michaud, pi. 10, f. 13, 14; 

 Alder, Mag. Zool. and Bot., p. 1 1 5 ; Fleming, Brit. An., p. 275 ; 

 Limneus glutinosus, Jeffreys, Linn. Tr., XVI, p. 371 ; Limnea 

 glutinosa, Sowerby, Genera, f. 5; Lymntea glutinosa, First Ed., 

 pi. 42, f. 27, 28; Helix glutinosa, Montagu, Test. Brit, p. 379, 

 pi. 16, f . 5 ; Fleming, Edin. Ency., VII, p. 81 ; Brown, Ency. 

 Brit, VI, p. 461 ; Myxas Mulleri, Leach, Moll, p. 149; Buc- 

 cinum glutinosum, Miiller, Verm, II, p. 129. 



Shell suborbicular, very thin, diaphanous, shining, smooth, or 

 obsoletely wrinkled longitudinally, and of a pale yellowish horn 

 colour; body extremely large, much inflated; spire very small, 

 consisting of three volutions, hardly rising above the body, well 

 defined by the suture, and terminating obtusely; aperture oval, 

 very large, extending nearly the whole length of the body; outer 

 lip excessively thin ; destitute of an umbilicus on the pillar. 



Found in ditches in England, Ireland, and Scotland. 



2. Amphipeplea lacustris, pi. XV, f. 24, 25 — First Ed, 

 pi. 42, f. 24, 25. 



Gulnaria lacustris, Leach, Moll, p. 146? 



Shell subovate, extremely thin, pellucid, and shining, of a pale 

 yellowish hprn colour ; body very large, and inflated ; spire ex- 

 cessively short, consisting of two small volutions, which hardly 

 rise above the body, superior one blunt at the apex; aperture 

 suboval, a little narrowed above; outer lip thin, expansive, with 

 its base rounded ; inner lip a little reflected on the columella, 

 with a slight subumbilicus behind it. 



I found this species in Loch Leveu, Kinrossshire, Scotland. 



It differs from the preceding species, in being larger and 

 thicker, the spire having but two volutions, in the aperture 

 being not so large and expanded, and in the base of the lip 

 being more rounded. 



In Lady Jardine's cabinet. 



Genus 39 Physa — Drapernaud. 



Shell sinistral, or with the volutions turning in a contrary 

 direction to the ordinary course, oval, or oblong, very thin, and 

 polished; spire usually prominent; aperture longitudinal, ovate, 

 or oblong, contracted above; outer lip very thin, and acute, 

 partly obtruding above the plane of the aperture ; inner lip 

 reflected on the columella. 



1. Physa fontinalis, pi. XIV, f. 54, 55 First Ed, pi. 



41, f. 54, 55. 



Physa fontinalis, Drapernaud, p. 54, pi. 3, f. 8, 9; Lamarck, 

 An. San. Vert, VI, pt. 2nd, p. 156; Pfeiffer, p. 94, pi. 4, f. 28; 

 Brard, p. 167, pi- 7, f. 7, 8; Fleming, Brit. An, p. 276; Leach, 

 Moll, p. 150; Turton, Man, p. 127, f. 110; Jeffreys, Linn. 

 Tr, XVI, p. 379; Alder, Mag. Zool. and Bot, II, p. 114; 

 Forbes, Mai. Mon, p. 14; Thompson, Ann. and Mag. Nat. 

 Hist, VI, p. 48 ; Bulla fontinalis, Montagu, Test. Brit, p. 

 226; Brown, Wernerian Mem, II, p. 516; lb, Ency. Brit, 

 VI, p. 433 ; Fleming, Edin. Ency, VII, p. 85 ; Limnea fonti- 

 nalis, Sowerby, Genera, f. 8 ; Planorbis bulla, Muller, Verm, 

 II, p. 167. 



Variety 1, pi. XIV, f. 56, 57. Shell somewhat more inflated, 

 and of a very pale horn colour, approaching to white. 



Physa alba, Turton, Zool. Journ, II, p. 363, pi. 13, f. 3; 

 lb, Man, p. 128, f. 111. 



Found in the river Towin, North Wales. 



Variety 2, pi. XIV, f. 83, 84. Volutions more oblique; body 

 less inflated ; base more acute ; and spire more obtuse. 



Helix Bullceoides, Donovan, Brit. Sh, pi. 168, f. 2; Bulla 

 fluviatiles, Turton, Conch. Diet, p. 27, the young shell. 



It is plentiful in a stream at Clonooney, King's County, 

 Ireland. 



Shell sinistral, oblong-oval, extremely thin, transparent, fragile, 

 and glossy, and of a greenish horn colour; body very large ; 6pire 

 very short, consisting of three or four volutions, the lower one a 

 little inflated, and terminating in a somewhat obtuse apex; aper- 

 ture oblong, occupying about three-fourths the length of the 

 shell, contracted, and pointed above, and rounded at the base. 

 Length about three-eighths of an inch ; breadth not quite a 

 quarter. 



Old shells are not unfrequently provided with a few longitudi- 

 nal and transverse wrinkles. 



This species is pretty generally diffused throughout Great 

 Britain and Ireland, in rivers, streams, and stagnant pools, adher- 

 ing to the under surface of aquatic plants. 



2. Physa acuta, pi. XIV, f. 58, 59— First Ed, pi. 41, f. 

 58, 59- 



Physa acuta, J. Sowerby, MSS. ; Bulla fontinalis, Maton 

 and Rackett, Linn. Tr, VIII, pi. 4, f. 1. 



Shell oblong-ovate, very thin, brittle, and transparent; body 

 very large ; spire very short, consisting of four volutions, and 

 terminating in an acute apex ; aperture oblong-ovate, somewhat 

 oblique, and lengthened beyond the body volution. Length 

 nearly half an inch ; breadth a quarter. 



Found in Anglesea, Wales, and first identified as British by 

 J. Sowerby, Esq., who bred it in a water-butt, and describes the 

 animal as differing materially from P. fontinalis. 



3. Physa hypnorum, pi. XIV, f. 60, 61— First Ed, pi. 

 41, f. 60, 61. 



Physa hypnorum, Drapernaud, p. 55, pi. 3, f. 12, 13; 

 Lamarck, An. San. Vert, VI, pt. 2nd, p. 157 ; Pfeiffer, p. 97, 

 pi. 4, f. 29; Alder, Mag. Zool. and Bot, II, p. 114; Turton, 

 Man, p. 129, f. 113; Thompson, Ann. and Mag. Nat. Hist, 

 VI, p. 34 ; Jeffreys, Linn. Tr, XVII, p. 381 ; Bulla hypno- 

 rum, Montagu, Test. Brit, p. 228 ; Brown, Wernerian Mem, 

 II, p. 517 ; lb, Ency. Brit, VI, p. 433; Maton and Rackett, 

 Linn. Tr, VIII, p. 127, pi. 4, f.3; Fleming, Edin. Ency, VII, 



