240 
LIMN^AD^. 
This is proved by the size he gives for Planorhis 
complanatus, Eossmasler has partly corrected this 
error ; he truly considers the P. complanatus of Tur- 
ton, as only a state of growth of JP. marginatus. 
108. 6. Planokbis complanatus. Margined Coil 
Shell. — Shell horn-colour, brown, semitrans- 
parent, striolate, flat or a little concave above, 
flattish, with a slight central concavity, be- 
neath ; whorls rapidly enlarging, flat, and 
strongly keeled above, ventricose and rounded 
to the margin beneath, (t. 8. f. 87, 88. 90.) 
Helix planorbis. Linn. Syst i. 1242.; part Penn. B. Z. ii. 
t. 83. f. 123.; Linn. Trans, viii. 188. t. 5. f. 13. — Planorbis 
umbilicatus. Muller, Verm. ii. 160. ; Jeffreys, Linn. Trans. 
xvi. 384. — Helix complanata. Linn. S. N. i. 1242. — Pla- 
norbis marginatus. Drap. p. 45. t. 2. f. 11, 12. 15. ; Itossm. 
Leon. ii. t. 2. f. 59. ; Brard, p. 152. t. 6. f. 5. ; Alder, Mag. 
Zool. and Bot. ii. 112.; Turton, Man. ed. 1. 107. f. 87.; 
Leach, Syn. Moll. 114. t. 2. f. 7, 8.; Forhes and Hanley, 
B.M. iv. 155. t. 127. f. 1, 2. — Planorbis carinatus. Sluder. 
— Planorbis complanatus. Flem. E. Ency. vii. 69., B. A. 
278, ; Turton, Man. ed. 1. 108. and f. 88. (not 89. as cited). 
— Helix limbata. Da Costa, B. C. 63. t. 4. f. 10., t. 8. f. 8. 
“ — Planorbis lacustris. Ragoum, H. Jour. i. 273. — Pla- 
norbis carinatus, var. h, Drap. Tab. 46. 
Var. 1. Planorbis turgidus. Jeffreys, Linn. Trans, xvi. 384. 
Var. 2. Helix rhombea. Forbes and Hanley, B.M. t. 127. f. 3.; 
Turton, Conch. Diet. — Planorbis rhombeus. Turton, Man. 
ed. 1. 108. f. 90. — Planorbis Sheppardi. Leach, Syn. Moll. 
115., fide Cab. Brit. Mus. — Helix Draparnaudi. Sheppard, 
Linn. Trans, xiv. 158.; Cab. Brit. — Planorbis Dra- 
parnaldi. Jeffreys, Linn. Trans, xvi. 306. — Planorbis de- 
formis. Zam. vi. 154. ? 
Var. 3., entirely without any keel. Alder, Catal. 113. 
Monstrosity, with the volutions elevated into a spiral cone, 
always dextral : Helix terebra. Turton, Diet. p. 62. f. 55. 
— Helix cochlea. Brown, Wern. Trans, ii. t. 24. f. 10. 
In stagnant waters and slow rivers. 
