Mollusca of Great Britain. 385 
Testa suprà umbilicatula, subtàüs convexiuscula, vix per- 
forata, utrinque in carinam acutam obliquata, lateri- 
bus subinzequalibus, tenuis, substriata, flavescens. An- 
fractus 6, subdepressi. Apertura angulata. 
Long. 0.2.—Diam. 0.65. 
Planorbis carinatus. Müll. Verm. 2. p. 151. Drap. 
Hist. des Moll. p. 46. t. 2. f. 16. 
Helix Planorbis. Linn. Syst. Nat. 1. p. 1249. Gmel. 
Syst. Nat. 1. p. 3617. 
—-— complanata. Mont. Test. Brit. p. 450. t. 25. f. 4. 
—-— planata. Maton 4 Rackett in Linn. Trans. 8. 
p.189. 4.5. f. 14. — 
In ditches, &c. ; but I have never found it mixed with 
the last. 
7. LuTESCENS. 
Animal pallide iii Tentacula pellucida. (Mont.) 
Testa dilatata, valde. depressa, suprà umbilicatula, sub- 
perforata, subtùs convexiuscula, utrinque in carinam 
acutam prominulam obliquata, lateribus æqualibus, 
fragilissima, hyalina, glabra, albido-lutescens. Anfrac- 
tus 4 vix 5. Apertura acuta, angulosa. 
Long. 0.125.—Diam. 0.5. 
Planorbis lutescens. Lam. Hist. des Anim. sans Vert. 6. 
p. 153. cdam. 
co Hebe carinata. Mont. Tat t BO 1. 
o Planorbis Jis. - , P 
E stagnant pools i ins counties of Eng- 
land ; often mixed with the last, but much less common. 
Schróter has noted all the three last species, though, as 
is evident from his referring his figure of the Planorbis ca- 
3n2 >o o finatus 
