HELIX. 897 



Planorbis carinatus. Mulhr Verm. ii. p. 157. 



Le Planorbe a quatre spiiales. Geoffroif, p. 90. No. 4. t. 3. 



Inhabits stagnant water in Europe, Linncms. France. Geqf- 

 JToy. Denmark and Italy. Mulhr. Great Britain. Mon- 

 tagu, Si'c. 



Shell about half an inch in diameter, of a pale horn-colour, 

 covered with a dusky green epidermis ; it has four trans- 

 versely striated whirls, which are coiled horizontally, and 

 the body-whirl is not so convex on the upper side as in H. 

 complanata, and has a keel round the middle, so as to be 

 equally conspicuous on both sides. 



COMPLANATA. 24. Shell flat, concave above, and 

 the whirls convex on the upper side, with a 

 keel on the lower edge of the body-whirl. 



Helix complanata. Li^naus Si/st. Nat. p. 1242. Sckroeter 



Fiuss. p. 239. t. 5. f. 22 to 25, and t. 1 1 C. f. 4 ; and 



Einl. u. p. 129. Chemnitz, ix. part 2. p. 96- t. 127. 



f. 11 21 and 1122. Gme/in, p. 3617. Montagu Test. 



p. 450. t. 25. f. 4. 

 Helix limbata. Da Costa Brit. Conch, p. 63. t. 4. f. 10, 



and t. 8. f. 8. 

 Helix Planorbis. Pennant Zool. iv. p. 133. t. 83. f. 123. 



Maton and Racket, in Lin. Trans, viii. p. 188. t. 5. f. 13. 



Dorset Cat. p. 52. t. 14. f. 8, and t. 20. f. 10. 

 Planorbis umbilicatus. Midler Verm. ii. p. I60. 

 Lister Anim. Ang. t. 2. f. 27, and Conch, t. 138. f. 42. Pe- 



tiver Gaz. t. 10. f. 11. Gualter,t.4. f. EE. Klein 



Ost. 1. 1 . f. 8. Favanne, t. 61 . f. B 5. 

 Inhabits fresh waters in Europe. Linnccus. Great Britain, 



Lister, &jC. 

 Shell about five-eighths of an inch in diameter, of a pale reddish 

 brown or horn-colour, not unfrequently covered with a dark 

 brown epidermis ; it has five transversely striated whirls, 

 which are coiled horizontally, and considerably convex on 

 the upper, but flat on the lower side ; the body-whirl has its 

 keel on the lower margin, and not in the middle, as in H. 

 Planorbis. Although most, or perhaps all the figures which 

 Linnaeus has quoted for H. Planorbis belong to the shell 

 which is here described, yet it appears to me that it must be 

 his H. complanata, from the description of that species in 

 the Fauna Suecica : " Margo qui anfractus cingit respicit 

 latus planus seu inferius." Of H. Planorbis he only says, 

 " Margo aufractuum prominet." 



