96 



MOLLUSCA. 



Melania. 



5. Melania lineata. — The Lineatcd Melania, pi. XLV. 

 fig. 31, 32. 



Melania lineata. Soncrby, III. p. 33, pi. 218, fig. 1. Fle- 

 ming, p. 317. 



Acuminated; body short; spire long, with nine or ten slightly 

 raised volutions, with a slight constriction towards the upper 

 portion of each ; whole surface covered with very fine, regular 

 striae, which is slightly bent towards the base of each volution, 

 and on the bodv they follow the curve of the outer lip ; aper- 

 ture subovate, a little contracted above, and rounded beneath. 

 Length about four times the diameter of the body. 



Inferior Oolite, Dundry. 



6. Melania Heuuingtonensis. — The Heddington Mela- 

 nia, pi. XLV. fig. 33. 



Melania Ileddingtonenns. Sowerby, I. p. 86, pi. 39, right 

 and left hand figures. Fleming, p. 317. Phillips, I. p. 116. 



Fusiform ; body short ; spire long, with eight or ten nearly 

 flat-sided volutions, with their upper portion slightly raised and 

 obtusely angular, and a little hollow in the middle; whole sur- 

 face rugged, with rather deep lines of growth. Length about 

 three times its diameter. 



Upper and Middle Oolite at Heddington, near Calne, Wilts. 



7. Melania striata. — The Striated Melania, pi. XLV. 

 fig. 35. 



Melania striata. Sowerby, I. p. 101, pi. 47. Fleming, p. 

 317. 



Elongated, abruptly tapering to the apex ; spire with eleven 

 or twelve well separated, somewhat inflated volutions ; body 

 nearly half the length of the shell; whole surface covered with 

 spiral, narrow, slightly elevated ribs, with about sixteen on each 

 volution, crossed by as many somewhat sharp, but fine longitu- 

 dinal stria;. Length about twice and a half its diameter; some- 

 times occurring about eight inches in length. 



Lias at Lymington, Somersetshire. 



8. Melania fasciata. — The Banded Melania, pi. XLV. 

 fig. 36, 37, 38. 



Melania foiciata. Sowerby, III. p. 71, pi. 241, fig. 1. Fle- 

 ming, p. 317. 



Turreted; spire consisting of about five volutions, each coro- 

 nated with rather remote, obtuse knobs ; surface with three 

 slightly coloured, transverse bands, and numerous spiral striae ; 

 aperture ovate, oblique. Fig. 38, natural size. 



Fresh Water formation. Isle of Wight. 



9. Melania? vittata. — The Filleted Melania, pi. XLV. 

 fig. 34. 



Melania vittata. Phillips, L p. 1 16, pi. 7, fig. 15. 



Elongated ; volutions deeply defined, with an obliquely flat- 

 tened fillet on the superior portion of each, and hollow in the 

 middle. 



Cornbrash at Scarborough and Gristhorpe. 



lU. Melania costata — The Ribbed Melania, pi. XXXV. 

 fig. .39, 40, 41. 



Milania cottala. Sowerby, III. p. 71, pi. 241, fig. 2. Fle- 

 ming, p. 317. 



Turreted ; spire long, consisting of six or seven gradually 

 tapering, nearly flat-sided volutions, with numerous, longitudi- 

 nal, slightly elevated ribs, crossed by fine spiral striaj ; aperture 

 ovate, obli()U(!. Length about three limes its diameter. Fig. 

 41, natural size. 



11. Melania tlmida. — The Swollen Melania, pi. XLV. 

 fig. 42. 



Melania tumida. Phillips, II. p. 229, pi. 16, fig. 2. 



Turreted, smooth ; body short ; spire long, consisting of 

 about eight very tumid, and deeply defined volutions; whole 

 surface covered with fine, regular, longitudinal striae ; aperture 

 oblique, ovate, wider than long. 



Mountain Limestone, Kildare and Bolland. 



12. Melania constbicta. — The Constricted Melania, pi. 

 XLV. fig. 43, 44. 



Melania conslricta. Sowerby, HI. p. 33, pi. 218, fig. 2. 

 Fleming, p. 317. Phillips, II. p. 228, pi. 16, fig. 1. Conchby- 

 liolithus constrictus, Martin, Pet. Derb. I. pi. 38, fig. 3. 



Turreted, smooth ; spire of eight or nine volutions, con- 

 stricted above, tumid on their lower parts, with an adpressed, 

 crenated, sutural, fimbriated margin. 



Mountain Limestone at Tideswell, Derbyshire, and Kildare. 



13. Melania bugifeba. — The Hugged Melania, pi. XLV. 

 fig. 45. 



Melania rugifera. Phillips, II. p. 229, pi. 16, fig. 26. 



Turreted, greatly elongated, smooth, finely striated; body 

 short ; spire long, consisting of eleven or twelve volutions, con- 

 vex below, and adpressed at the suture, on the lower half of 

 each, oblique, slightly arcuated, very strong, longitudinal ribs, 

 which are very prominent at their base, terminating in an acute 

 apex ; aperture subovate. 



Mountain Limestone, Otierhurn, Northumberland, &c. 



14. Melania compbessa. — The Compressed Melania, pi. 

 XXXIIL* fig. 28, 29. 



Elongated ; body and spire about equal in length ; the latter 

 with six or seven abruptly tapering volutions, separated by a 

 deep waved, sutural line, and terminating in an acute apex, a 

 spiral depression occupies the upper portion of each ; whole sur- 

 face marked by irregular waved, longitudinal stria;. 



Found at Gisbornc, Yorkshire, by Mr. S. Gibson, of Hebden 

 Bridge, and in his cabinet. 



FAMILY Vin.-LYMN/ECEA. 



Shells spiral, generally smooth on the external sur- 

 face ; margin of the outer lip always acute, and nut 

 reflected. The animals of this family are fluviatile, am- 

 phibious, and usually destitute of an operculum. 



Genus LI LYMNiEA — Lamarck. 



Shell oblong, thin, sometimes elongated, and acutely 

 turreted ; spire always produced ; aperture large, entire, 

 oblong, generally straitened, somewhat acuminate above, 

 and rounded below ; outer lip acute ; the lower part of 

 the inner lip ascending on the columella, forming an 

 oblique fold, or plait, and rising, spreads more or less on 

 the columella, or front of the body volution; external 

 surface smooth, frequently polished; destitute of an 

 operculum. 



