Ampuli.aiua. MOLLUSCA. PECTINIBRANCHIA. SV1 
ture suborbicular ; right lip enlarged. — Sower. Min. Conch, t. cclxxxiv. twcv 
lower figures. — London Clay. 
4. A. ambulacrum. — Globose, with a canal round an acute spire ; pillar-ca- 
vity plain within — Sower. Min. Conch, t. ccclxxii. — London Clay. 
5. A. nobilis — Subglobose, smooth ; spire conical, composed of a few con- 
vex whorls ; base very convex ; no pillar cavity ; aperture elliptical, sublu- 
nate, pointed above.— Min. Conch, t. Dxxii. f. 1. — Carboniferous Lime- 
stone. 
6. A. helicoidis — Almost discoid, smooth ; spire very short, blunt ; whorls 
nearly blended, round ; base with a pillar cavity ; aperture oblong. — Sower. 
Min. Conch, t- Dxxii. f. 2. — Carboniferous Limestone.^ Ireland. 
7. A. canaliculata “ Ventricose, whorls three or four; transversely and 
obliquely striated ; the striae decussating each other ; spire short ; turns of 
the spire separated by a deep channel.” — Mant. Geol. Suss. 87. t. xix. f. 13. 
Blue Chalk Marl. — Mr Mantell likewise refers another shell to this genus, 
but with doubt, “ a subglobose, ventricose, univalve,” pi 111. t. xviii. f. 11. 
Gen. MELANIA.— Shell turrited; aperture oblong; pillar- 
lip smooth, and bent in the middle. 
1 . M. sulcata Spire more than five times the length of its diameter, with 
spiral striae ; a concave furrow between each whorl ; whorls fourteen — Sower. 
Min, Conch, t. xxxix. middle figure — London Clay., Stubbington Cliffs. 
2. M. Heddingtmensis . — A shell about three times as long as the diameter ; 
whorls eight or more, the surface of each concave near the middle, with an 
obtuse angled rising near the upper part— Nowm Min. Conch, t. xxxix. right 
and left hand figures — Upper and Middle Oolite. 
3. M. striata . — Length two and a half times as long as the diameter ; whorls 
six or more, with about sixteen rounded spiral ribs, nearly equal on the outer 
part of the whorls, but widened on the concealed parts, — Sower. Min. Conch, 
t. xlvii. — Lias. 
4. M. lineata — Acuminated ; whorls nine, finely striated across ; aperture 
angular above — Sower. Min. Conch, t. ccxviii. f. 1 — Inferior Oolite^ at Dun- 
dry. 
5. 'M-. fasciata. — Turrited, short; whorls six, spirally striated, marked with 
three coloured bands, coronated; aperture ovate. — Sower. Min. Conch, t. 
ccxli. f. 1. — Fresh-water Formation., Isle of Wight. 
6. M. costata — Turrited, spirally striated, transversely ribbed ; mouth ob- 
ovate. — Sower. Min. Conch, t. ccxli. f. 2.— ^London Clay, HordWeU. 
7. M. minima. — Turrited, smooth ; sides straight ; mouth ovate, pointed 
above ; base slightly produced. — Sower. Min. Conch, t. ccxli. f. 3.. — London 
Clay, Brakenhurst, Hants. 
8. M. truncata Conical, elongated, smooth ; whorls angular below ; mouth 
ovate, acute above, truncated below — Sower. Min. Conch, t. ccxli. f. 4, — Lon- 
don Clay, Brakenhurst. 
With the exception of M. fasciata, it is doubtful if any of the preceding 
species belong to the genus Melania. It is more probable that they are re- 
lated to the marine Turbmidee. 
9. M. cos/e/toa.— Turrito-subulated spirally, with numerous longitudinal 
ribs ; anteal lip with a canal in the inside. — Lam. Hist, Vert. vii. 543. {Bran^ 
der, Foss. Hant. f. 27-) — Mant. Geol. 269. 
