LIMN^US. 167 



Lymnwa ora/fl, Lam. Anim. s. Vert. (ed. Desh.) vol. viii. p. 41?. — Kenyon, Mag. 

 Nat. vol. i. p. 425, f. 182, g. —Nils. Moll. Siiec. Tcr. et Fluv. 

 p. 63. 

 „ intermedia. Lam. (as of Ferus.) Anim. s. Vert. (ed. Desh.) vol. viii. 



p. 414. — Deles. Rec. Coq. Lam. pi. 30, f. 7. 

 „ putris, Fleming, Eneyclop. Edin. vol. vii. pt. 1, p. 77. 

 Limnca lutea, Fleming, Brit. Anim. p. 275. 



„ limosa, Fleming, Brit. Anim. p. 274. 

 Lymnea ovata, vulgaris and pcregra, Schub. and Wagn. Chem. Conch. Cab, 



vol. xii. p. 179, 180, pi. 235, f. 4127 

 to 4130. 

 Limnetis vulgaris, KiCKx, Moll. Brabant, p. 55. 



Limnca marginata, Michaud, Comp. Drap. Moll. France, p. 88, pi. 16, f. 15, 16. 

 — Gras, Moll. Ter. et Fluv. France, pi. 4, f. 47. 

 „ intermedia, Michaud, Comp. Drap. Moll. France, p. 86, pi. 16, f. 17, 18. 



—Gras, Moll. Ter. et Fluv. France, pi. 5, f. 4. 

 „ litieata. Bean, Mag. Nat. Hist. vol. vii. p. 493, f. 62. 

 Lym?icEus ovatus, Kl'eebvrg, Moll. Borus. Syn. 'p. 23. — Rossmassl. Iconog. 



Land und SUssw. Moll.pt. 1, p. 100, pi. 2, f. 5G. 

 Lymnea lacustris, Pgtiez and Mich. Gal. Douai, Moll. vol. i. p. 219, pi. 22, 



f. 11, 12. 

 Limnea ovata, Gras, Moll. Ter. et Fluv. France, pi. 5, f. 3. 



„ peregra, Gras, Moll. Ter. et Fluv. France, pi. 4, f. 45, 46. 



So infinite are the variations of shape in this most abun- 

 dant species, that we must content ourselves with describ- 

 ing the ordinary characteristic form (pi. OXXIII., f. 4, 6) 

 and then indicating a few of the principal aberrations from 

 it, which occur in our islands. 



Shell ovate-acute, oval-acute, or sub-rhombic oval and 

 rounded below, horn-coloured, sometimes with a ferrugi- 

 nous film, more or less thin and glossy, slightly wrinkled 

 lengthways, with the usual spiral interruptions or lines of 

 the genus by no means conspicuous. Spire ranging from 

 scarcely one-sixth to about one-third (with a corresponding 

 increase of area) of the dorsal length, composed of four 

 tapering turns, that are of moderately fast longitudinal in- 

 crease, swell out convexly from beneath the suture, and are 

 well rounded below ; of these the penult is not small-based 



