PLATE XLIY. 
1,2. Nerita Costata. (Bibbed Nerita.) Globular; spire depressed, with two volutions, with canaliculate suture; with many 
sharp longitudinal ribs ; aperture orbicular, expanded; outer lip expanded; pillar lip produced, obtuse, divided by slight sinus into 
two blunt teeth. 
3,4. N. Laevigata. ( Smooth Nerita.) Subglobose, smooth, glossy; spire conical, with two Hat-sided volutions ; body with sub¬ 
central, transverse sulcus; base convex; aperture sublimate; outer lip smooth-edged; columella obscure. 
5-7. N. Minuta. (Minute Nerita.) Orbicular, smooth; spire obscure, depressed; aperture oval; outer lip blunted; pillar 
lip destitute of teeth. Diameter less than £ in. Fig. 7, natural size. 
8, 9. N. Aperta. ( Open Nerita.) Suborbicular, smeoth, with acute, zigzag lines; spire depressed, with two volutions; aperture 
wide, semilunate ; outer lip thickened ; inner lip reflected on columella; its inner edge crenated, and with one large tooth. 
10,11. N. Globosa. (Globular Nerita.) Suborbicular; spire with two volutions ; aperture orbicular, within which a lamelliform 
tooth; outer lip thin ; pillar lip reflected on columella, with obtuse tooth; surface transversely sulcated. 
12-14. Pileolus Plicatus. (Plicated Pileolue.) Conical, with divergent ridges ; margin crenated; centre of base in cusliion-like 
form, divided by sulcus into two parts ; inner lip strongly crenated. 
15-17. P. Lsevis. (Smooth Pileolus.) Depressed, smooth, with irregular, divergent sulci; margin entire ; inner lip crenated. 
18,19. Neritina Uniplieata. (One-plaited Neritina .) Subglobular ; body large; spire concealed ; aperture semilunar ; outer 
lip sharp at edge; inner lip very broad, convex, its edge curved, and with one tooth-like projection. 
20,21. N. Concava. (Concave Neritina.) Subovate; body large, with undulating, zigzag, dark-coloured lines; spire short, 
oblique, with three volutions ; aperture semicircular ; outer lip entire, smooth, even on edge ; pillar lip reflected on columella. 
22, 23. Ampullaria Patula. (Wide Ampullaria.) Ovate, ventricose, smooth; body large; spire small, with four rounded volu¬ 
tions ; apex acute; aperture subovate; outer lip smooth, even; inner lip reflected on columella; umbilicus large, open. 
24,25. N. Spirata. (Short-spired Nerita.) Subglobose, smooth; spire minute with two volutions and obscure canal round 
their base; body large, broadly canaliculate above ; aperture transversely ovate. 
26,27. N. Sinuosa. (Sinuated Nerita.) Subovate; spire short, with three inflated volutions ; aperture elongated; outer lip 
plain, with sinuated lobe on its edge near base; columellarlip broad, flat; body with angular, transverse sinus, and bordered by 
obtuse keel; ‘with irregular, well-marked stria). 
28. A. Nobilis. (Noble Ampullaria.) Subglobose ; spire conical, with five inflated volutions; apex acute ; base convex, without 
umbilicus; aperture oblong-oval, sublimate. 
29, 30. A. Helicoides. (Helix-like Ampullaria.) Discoidal, smooth; spire short, with inflated volutions; body inflated at 
sides; base with deep umbilicus ; aperture ovate; outer lip expanded. 
31,32. A. Ambulacrum. (Gallery Ampullaria.) Spherical, smooth; body large, inflated; spire small, conical, with seven 
ventricose volutions and deep spiral canal; aperture cblong-ovate; outer lip smooth, even; inner lip reflected on columella; 
umbilicus open, plain internally. 
33,34. A. Acuta. (Acute Ampullaria.) Subovate, smooth, ventricose; body large; spire conical, with five inflated volutions ; 
apex acute ; aperture oblong-ovate; outer lip plain, smooth ; pillar lip curved, reflected on columella; umbilicus small. 
35,36. A. Sigaretina. (Sigaretus-lilce Ampullaria.) Body large, inflated; spire small, subconic, with four ventricose volu¬ 
tions ; aperture large, suborbicular ; outer lip expanded, smooth, even ; inner lip reflected on columella ; with sharp, irregular, waved 
stria) externally. 
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