PLANORBIS. 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, Drapamaud. 



Less compressed than the last species, wrinkled and roughisb, 

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



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



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



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



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. 



Plattorbus uinbilicatiis, Muller, Hist. Verm. pt. 2, p. 160. — Jeffreys, Trans. 



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



Hist. vol. vi. p. 124. 



Helix limbaia. 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. 1 1, 



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, Illust. 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 SUssw. 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. bQ, pi. 4, f. 38.— 

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

 Moll. Pyren. p. 62. 



Hcliiv 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. 

 „ Draparnatuii, Sheppard, Trans. Linn. Soc. vol. xiv. p. 158 (fide Gray 

 from type in Brit. Museum). 

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



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

 rJiombeus, 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. 



