AlIPDLLARIA. MOLLUSCA. 



Genus XLVII.—AMPULLARIA.— ZamarcA. 



Shell globular, or globularly discoidal, or discoidal and 

 umbilicated ; spire short, the volutions ventricose ; aper- 

 ture entire, oblong-oblique, and its length considerably 

 exceeding its breadth; operculum testaceous, annular, 

 with its nucleus almost central, but placed rather nearer 

 the inner side ; covered by an olive-green epidermis, and 

 exactly fitting the aperture. 



1. Ampullahia patula The Wide AmpuUaria, pi. 



XLIV. fig. 23. 



AmpuUaria patula. Lamarck, En v. de Paris, p. 148. Sow- 

 erby, III. p. 152, pi. 284, two middle figures. Fleming, p. 316. 

 Helix mutabilis, Brander, fig. 57. 



Slightly ovate, ventricose, smooth ; body large ; spire small, 

 very short, consisting of four rapidly decreasing, rounded volu- 

 tions, sometimes slightly flattened above, terminating in an 

 acute apex ; aperture subovate ; outer lip expanding, smooth, 

 and even on the edge ; inner lip broadly, but thinly reflected 

 on the columella, with a large open umbilicus situate in its 

 centre, very slightly closed on the left edge of the opening, 

 below which a lamina protrudes, which forms the lining of the 

 umbilicus. 



Found in the London Clay at Barton. 



2. Ampullaria nobilis The Noble AmpuUaria, pi. 



XLIV. fig. 28. 



Ampullaria nobilis. Sowerby, VI. p. 39, pi. 522, fig. 1. 

 Fleming, p. 317. 



Body subglobose ; spire occupying about a third of the 

 length of the shell, conical, consisting of five slightly inflated 

 volutions, with a rather sharp apex ; base convex, and destitute 

 of an umbilicus ; aperture oblong-oval, sublunate, somewhat 

 contracted above, and extending about a half of the length of 

 the shell. 



Found in the Carboniferous Limestone called the Black 

 Rock, Queen's County, Ireland. 



3. Ampullaria helicoidis. — The Helix-like Ampullaria, 

 pi. XLIV. fig. 29, 30. 



Ampullaria helicoidis. Sowerby, VI. p. 40, pi. 522, fig. 2. 

 Fleming, p. 317. 



Nearly discoidal, smooth ; spire short, obtuse, the volutions 

 inflated, and deeply divided by the sutural line; body consider- 

 ably inflated at the sides ; base with a deep, moderately-sized 

 umbilicus; aperture ovate, somewhat contracted above, and well 

 rounded below ; the outer lip considerably expanded. Diame- 

 ter nearly double its length. 



Found in the Carboniferous Limestone of Cork and Queen's 

 County, Ireland. 



4. Ampullaria ambulacrum, — The Gallery Ampullaria, 

 pi. XLIV. fig. 31, 32. 



Ampullaria ambulacrum. Sowerby, IV. p. 97, pi. 372. 

 Fleming, p. 317. 



Nearly spherical, smooth ; body large, much inflated ; spire 

 small, abruptly conical, consisting of seven ventricose volutions, 

 with a deep spiral, flat-bottomed canal, with nearly perpendicular 

 margins, winding round the base of each ; aperture oblong-ovate, 

 contracted above, and rounded at the base ; outer lip smooth, 

 and even ; inner lip broadly reflected on the columella above, 



93 



but becoming gradually narrower as it descends, and is lost in 

 the outer lip as it passes the umbilicus, which is open, and plain 

 internally. 



The A. canaliculata of Lamarck has a strong resemblance to this 

 species ; hut the umbilicus being destitute of an internal spiral groove, 

 the trench-like appearance of its canal, and the inflation of its sides, 

 form good distinctions. 



Found in the London Clay at Stubbington, Hordwell, and 

 Muddiford. 



5. Ampullaria acuta The Acute Ampullaria, pi. 



XLIV. fig. 33, 34. 



Ampullaria acuta. Lamarck, Env. de Paris, p. 1 47. Sow- 

 erby, III. p. 151, pi. 284, three upper figures. Fleming, p. 

 316. Helix mutabiles, Brander, fig. 58, 59. 



Subovate, smooth, ventricose ; body large ; spire conical, a 

 fourth of the length of the shell, consisting of five inflated, 

 deeply divided volutions, terminating in an acute apex; aperture 

 oblong-ovate, its length nearly double its width, contracted and 

 pointed above, rounded at the base; outer lip plain, and smooth 

 on the edge, and not so much expanded as the former species ; 

 pillar lip gently curved, reflected on the columella, moderately 

 broad, equal in width its whole length, and generally covering 

 half of the umbilicus, which is naturally rather small. 



Found in the London Clay at Christ Church. 



6. Ampullaria Sigaretina. — The Sigaretus-like Ampul- 

 laria, pi. XLIV. iig. 35, 36. 



Ampullaria Sigaretina. Lamarck, Env. de Paris, p. 148. 

 Sowerby, III. p. 152, pi. 284, two lower figures. Fleming, p. 

 316. 



Body of the shell large, much inflated, and forming a short, 

 oblique oval; spire small, subconic, consisting of four ventricose, 

 deeply defined, rapidly decreasing volutions ; aperture large, 

 suborbicular, a little contracted and pointed above, and much 

 rounded at the base ; outer lip much expanded, smooth, and 

 even on the edge ; inner lip broadly reflected on the columella, 

 and subdivided, one part entering the umbilicus, and lining 

 more than half its internal surface; the other portion closes the 

 umbilicus ; external surface with sharp, elevated, irregular, 

 slightly waved striae, or lines of growth. 



Found in the London Clay at Bognor, Hampshire. 



Genus XLVIIL— PALUDINA.— LamcrrcA. 



Shell ovate, or oblong; spire somewhat turreted; volu- 

 tions smooth ; rounded and subcarinated in most species : 

 aperture subrotund, ovate, or oblong, a little angulated 

 above, and slightly modified on the inner side by the 

 gibbosity of the body volution ; operculum corneous, 

 with concentric lines of growth, and provided with a 

 sublateral nucleus. 



1. Paludina concinna The Neat Paludina, pi. XLV. 



fig. 1. 



Paludina concinna. Fleming, p. 316. Vivipara concinna, 

 Sowerby, L p. 80, pi. 31, fig. 4, 5. 



Conical, smooth; spire with four well defined, slightly inflated 

 volutions, angulated below, and ending in a sharp apex; aperture 

 ovate, acute above, and rounded beneath. 



Found in the London Clay at Barton Cliff. 

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