94 
MOLLUSCA. 
Paludina. 
2. Paludina lenta.— The Flimsy Paladin a, pi. XLV. 
fig. 2, 3, and 9« 
Paludina lenta, Fleming, p. 316. Vivipara lenta , Sowerby, 
I. p. 79, pi. 31, fig. 3. Helix lenta , Brander, fig. 60. 
Oblong-ovate, smooth; spire consisting of four inflated, 
deeply divided volutions, ending in an acute apex; aperture 
nearly orbicular, entire, slightly contracted above, and rounded 
below; surface sometimes exhibiting distinct lines of growth. 
Length an inch ; breadth not half an inch. 
Found in the London Clay at Barton Cliff and Hordwell. 
3. Paludina Extensa. —The Long Paludina, pi. XLV. 
fig. 4, 5. 
Paludina extensa. Fleming, p. 316. Sowerby, I. p. 78, pi- 
31, fig. 2. 
Smooth, oblong-ovate; body inflated; spire consisting of four 
somewhat ventricose volutions, a little angular below; aperture 
nearly orbicular, a little contracted above; outer lip somewhat 
extended; inner lip slightly reflected over the columella, with a 
small, narrow umbilicus behind it. 
Found in the London Clay at Blackdown, Ilordwell, and 
Barton. 
4. Paludina suboperta. —The Half-covered Paludina, 
pi. XLV. fig. 7, 8. 
Paludina suboperta, Fleming, p.316. Vivipara suboperta. 
Sowerby, I. p. 80, pi. 31, fig. 6. 
Convex, smooth; spire with four inflated volutions, with a 
flattened line on their superior portion, and terminating in an 
acute apex; aperture ovate, contracted above; inner lip a little 
reflected on the columella. 
Found in the Crag at Holywells. 
5. Paludina fluviorum. —The Fresh Water Paludina, pi. 
XLV. fig. 12, 13. 
Paludina Jluviorum. Fleming, p. 316. Vivipara fuvio- 
rum , Sowerby, I. p. 79, pi. 31, fig. 1. Mantell, Geo. of 
Sussex, p. 45, pi. 17, fig. 56. Fitton, Geo. Trans. IV. 2nd 
series, p. 363. 
Ventricose, smooth; spire with four or five inflated volutions, 
well defined by the sutural line, and terminating in an acute 
apex; lines of growth sharp, nearly equidistant, and having the 
appearance of fine stria?. 
Found in the Weald Clay, above and below the Iron Sand, 
Sussex and Isle of Wight. 
6. Paludina carinifera -The Keeled Paludina, pi. 
XLV. fig. 10, 11. 
Paludina carinifera, Sowerby, VI. p. 12, pi. 509, fig. 3, 
Fleming, p. 316. Fitton, Geo. Trans. IV. 2nd series, p. 363. 
Elongated, smooth, convex; spire with three or four volu¬ 
tions, ending in a blunted apex, the two superior volutions 
encompassed with a linear keel at their lower edge; aperture 
slightly ovate, a little contracted above. 
Found in the Purbeck Limestone and Hastings Sand, Sussex. 
7. Paludina elongata _The Lengthened Paludina, pi. 
XLV. fig. 14, 15. 
Paludina elongata, Sowerby, VI. p. 11, pi. 509, fig. 1, 2. 
Fleming, p. 316. Fitton, Geo. Trans. IV. 2nd scries, p. 363. 
Considerably elongated, smooth; body and spire of nearly 
equal length; the latter with four not much inflated, but well 
defined, rather oblique volutions, with a sharp apex; aperture 
oblong, somewhat contracted above. 
Found in the Weald Clay at Compton Grange, Chive, Isle of 
Wight; East Peckham, Kent; and Sussex. 
8. Paludina Sussexensis — The Sussex Paludina, pi. 
XXXIII* fig. 18. 
Paludina Sussexensis, Sowerby, Zool. Trans. IV. N. series, 
p. 346, pi. 22, fig. 6. 
Elongated, smooth; spire acute, consisting of four flat-sided 
volutions. 
Found in the Hastings Sand, Sussex. 
FAMILY VII.—MELANIDES. 
Fluviatile shells, with the margin of the aperture 
disunited, the outer lip edged; animal furnished with 
two tentacula. 
Genus XLIX .MELANOPSIS— Ferussac. 
Shell oblong, fusiform, or conico-cylindrical; spire 
with from five to fifteen volutions, terminating in a 
pointed* apex, but decollated in some species; body fre¬ 
quently equal to two-thirds of the whole shell; aperture 
oblong-ovate, pointed at the upper extremity; outer 
lip somewhat thickened, slightly inflected, and deeply 
notched above; columella twisted, solid, callous, and 
separated from the exterior margin at the base, by a 
deep sinus, in most species, but devoid of it in some; 
callosity thickest at its junction with the upper extremity 
of the aperture; operculum spiral, corneous, and not 
quite fitting the aperture. 
1. Melanopsis brevis —The Short Melanopsis, pi. XLV. 
fig. 24, 25. 
Melanopsis brevis, Sowerby, VI. pi. 523, fig. 2. Fleming, 
p. 359. 
Ovate; body large, inflated, smooth; spire short, with three 
well rounded volutions, a little contracted above; apex acute; 
aperture oval, a little narrowed both above and below; outer 
lip plain; inner lip thickened, equal in breadth its whole length; 
callus rather flat. Diameter about two-thirds of its length. 
Found in the Hampshire Fresh Water formation of Hord¬ 
well. 
2. Melanopsis carinata. —The Keeled Melanopsis, pi. 
XLV. fig. 18, 19. 
Melanopsis carinata, Sowerby, VI. p. 41, pi. 503, fig. 1. 
Fleming, p. 359. 
Oblong-ovate, considerably acuminated, smooth; body very 
large; spire short, consisting of five volutions, with a spiral keel 
winding along the upper edge of each, giving a lurreted aspect 
to the spire; tip acute; body with flattened sides, and an 
obscure carina near its upper edge; aperture elongated, a little 
contracted both above and below; outer lip thin, and plain on 
the edge; inner lip broadly reflected upon the columella. 
Length somewhat more than double its diameter. 
