PLANOKBIS. 155 



east. It is generally diffused but very local also in Ireland 

 ( W. Thompson), where the variety disciformis occurs at 

 Nenagh, in Tipperary (T. Hincks). It does not reach 

 Scotland. 



P. marginatus, Draparnaud. 



Less compressed than the last species, wrinkled and roughish, 

 not polished, shallowly concave above, flat below, carinated. 



Plate CXXVII. fig. 1, 2, and (var. rhombeus) fig. 3. 



Helix planorbis, Linn. Syst. Nat. ed. 12, p. 1242 (in part). — Pennant, Brit. 



Zool. ed. 4, vol. iv. p. 133, pi. 83, f. 123. — Pulteney, 



Hutchins, Hist. Dorset, p. 46. — Maton and Rack. Trans. 



Linn. Soc. vol. viii. pi. 5, f. 13. — Dorset Catalog, p. 52, pi. 14, 



f. 8, and pi. 20, f. 1 0. 



Planorbus umbilicalus, Muller, Hist. Verm. pt. 2, p. 160. — Jeffreys, Trans. 



Linn. Soc. vol. xvi. p. 384. — Thompson, Ann. Nat. 



Hist. vol. vi. p. 124. 



Helix limbata, Da Costa, Brit. Conch, p. 63, pi. 4, f. 10, and pi. 8, f. 8. 



Planorbis marginatus, Draparn. Moll. Ter. et Fluv. France, p. 45, pi. 2, f. 11, 



12, 15. — Turt. Manual L. and F. W. Shells, p. 107, 



f. 87. — Alder, Mag. Zool. and Bot. vol. ii. p. 112. — 



Gray, Manual L. and F. W. Shells, p. 265, pi. 8, f. 87, 



88, 90. — Brown, Must. Conch. G. B. p. 32, pi. 14, 



f. 39, 40, 41.— Brard, Coq. Paris, p. 152, pi. 6, f. 5.— 



C. Pfeif. Deutsch. Land und SUssw. Moll. pt. 1, p. 75, 



pi. 4, f. 1, 2.— Nils. Moll. Suec. Ter. et Fluv. p. 80.— 



Kickx, Moll. Brabant. Austral, p. 64. — Rossmassl. 



Iconog. Land und Stissw. Moll. pt. 1, p. 102, pi. 2, f. 59. 



— Philippi, Moll. Sicil. vol.i. p. 145, and pi. 2, f. 119. 



— Gras, Moll. Ter. et Fluv. France, p. 59, pi. 4, f. 38.— 

 Hartm. Erd und Siissw. Gaster. pi. 33. — Mermet, 

 Moll. Pyren. p. 62. 



Helix complanata, Mont. Test. Brit. p. 450, pi. 25, f. 4. — Turt. Conch. Diction, 

 p. 46. — Wood, Index Testaceolog. pi. 33, f. 24. — Dillw. 

 Recent Shells, vol. ii. p. 897. 

 „ Druparnuudi, Sheppard, Trans. Linn. Soc. vol. xiv. p. 153 (fide Gray 

 from type in Brit. Museum). 

 Planorbis turgidus, Jeffr. Trans. Linn. Soc. vol. xvi. p. 383. 



„ Draparnaldi, Jeffr. Trans. Linn. Soc. vol. xvi. p. 386, 522. 

 „ rhombeus, Turt. Manual L. and F. W. Shells, p. 108, f. 90. 

 „ complanatus, Fleming, Brit. Anim. p. 278. — Turt. Manual L. and F. 

 W. Shells, p. 108, f. 88 (error for 89).— Desh. Lam. 

 Anim. s. Vert. (ed. Desh.) vol. viii. p. 390. — Cantr. 



