PLATE XLY. 
1. Paludina Concinna. {Neat Faludina.) Conical, smooth; spire, with four inflated volutions; apex sharp ; aperture ovate. 
2,3,9. P. Lenta. (Flimsy Faludina.) Oblong-ovate, smooth; spire, with four inflated volutions; apex acute; aperture 
orbicular, entire; sometimes with distinct stria?. Length, 1 in.; breadth, \ in. 
4,5. P. Extensa. (Long Faludina.) Smooth, oblong-ovate; body inflated; spire, with four ventricose volutions; aperture 
orbicular; outer lip extended; inner lip reflected on columella; umbilicus small, narrow’. 
6. Melanopsis SedgWickR. ( Sedgwick's Melanopsis.) Smooth, oblong, fusiform; body very large; spire short, with three 
volutions; aperture oblong; outer lip inflected; pillar lip spread over columella. 
7,8. P. Suboperta. (Half-cov&'ed Faludina.) Convex, smooth; spire, with four inflated volutions; apex acute; aperture 
ovate; inner lip reflected on columella. 
10,11. P. Carinifera. (Keeled Faludina .) Elongated, smooth, convex; spire, with three or four volutions; apex blunted; two 
upper volutions with linear keel at lower edge; aperture ovate. 
12,13. P. Fluviorum. (Fresli-water Faludina.) Yentricose, smooth; spire, with four or five inflated volutions; apex acute; 
stria? sharp, equidistant. 
14, 15. P. Elongata. (Lengthened Faludina.) Elongated, smooth ; body, with four well-defiued, oblique volutions ; apex sharp ; 
aperture oblong. 
16,17. M. Subulata. (Aid-shaped Melanopsis.) Smooth, subulate, conical; spire elongated, with six or seven flat-sided 
volutions; aperture ovate, short. 
18,19. M. Carinata. (Keeled Melanopsis.) Oblong-ovate, acuminated, smooth; body large, spire short, with five volutions, 
with spiral keel on upper edge of each; apex acute; aperture elongated; outer lip thin, plain; inner lip reflected on colum ella. 
20,21. M. Fusiformis. (Fusiform Melanopsis.) Smooth, sub-cylindrical, fusiform; spire, with four volutions; apex obtuse; 
aperture oblong; inner lip glossy, spread over columella. 
22,23. M. Deptfordensis. (Deptford Melanopsis.) Smooth, oblong-ovate, fusiform, acuminated; body ventricose in middle; 
spire, w'ith three flat-sided volutions ; apex acute ; aperture elongated, sharp ; outer lip undulated ; inner lip reflected on columella. 
24, 25. M. Brevis. ( Short Melanopsis.) Ovate; body large, inflated, smooth; spii’e, with three volutions; apex acute ; aperture 
oval; outer lip plain; inner lip thickened; callus flattish. 
26. Melania Suleulosa. (8ulcated Melania.) Elongated; with convex volutions, with longitudinal, arcuated sulci. 
27,28. M. Truncata. (Truncated Melania.) Smooth, polished, elongated, conical; body short; spire long, with eight or nine 
volutions ; aperture ovate, truncated; outer lip thickened. Length less than T \ in. 
29, 30. M. Minima. (Least Melania.) Smooth, subulate; body short, spire long, with eight or nine volutions ; aperture ovate ; 
very minute. Length less than in. 
31,32. M. Lineata. (Lineated Melania.) Acuminated; body short; spire long, with nine or ten raised volutions; with fine, 
regular stria?; aperture sub-ovate. 
33. M. Heddingtonensis. (Heddington Melania.) Fusiform; body short; spire long, with eight or ten volutions; surface 
rugged, with deep lines of growth. 
34. M. Vittata. (Filleted Melania.) Elongated; volutions well defined, with oblique, flattened fillet on superior portion of 
each, hollow in centre. 
35. M. Striata. (Striated Melania.) Elongated, tapering; spire, with eleven or twelve inflated volutions ; with spiral, narrow 
ribs, about sixteen on each volution, crossed by sharp, longitudinal strife. Length sometimes 8 in. 
36. 37, 38. M. Fusciata. (Banded Melania.) Turreted; spire, with five volutions, each crowned with obtuse knobs; with three 
coloured, transverse bands, and many spiral strife; aperture ovate, oblique. Fig. 38, natural size. 
39, 40, 41. M. Costata. (Ribbed Melania.) Turreted; spire long, with six or seven tapering volutions, with many longitudinal 
ribs, crossed by spiral stria?; aperture oblique, ovate. Fig. 41, natural size. 
42. M. Tumida. (Swollen Melania.) Turreted, smooth; body short; spire long, with eight tumid volutions; with fine, 
longitudinal striae; aperture oblique, ovate. 
43, 44. M. Constricta. ( Constricted Melania.) Turreted, smooth ; spire, with eight or nine volutions, constricted above, tumid 
below; with crenated, fimbriated margin. 
45. M. Rugifera. (Rugged Melania.) Turreted, elongated, smooth, striated; body short; spire long, with eleven or twelve 
volutions, convex below; with strong, longitudinal ribs; apex acute; aperture subovate. 
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