410 
MOLLUSCA. 
Melania amarula. — The Crowned Melania. 
Plate LXXXVI. fig. 8. 
Ovate-oblong, thick; longitudinally wrinkled ; transversely 
striated at the base of the body; upper margin of the volutions 
crowned with triangular tubercles, from which emanate ciliated 
spines ; colour deep chestnut, covered with a black epidermis. 
One and a half inch long. Inhabits the rivers of India. 
TRIBE IX.-LYMNJECEA. 
The animals of this tribe are amphibious, usually without an 
operculum ; and having flattened tentacula ; shell spiral, generally 
smooth on the external surface; the margin of the outer lip is 
always acute, and not reflected. 
Genus 66.—LYMNiEA.— Bruguiere . 
Generic Character. —Shell oblong, sometimes turrited ; spire 
produced; aperture entire, oblong; the outer lip acute; the 
lower part of the inner lip rising on the columella, and forming 
an oblique plait; destitute of an operculum. 
Lymncea stagnalis .— The Pond Lymn^ea. 
Plate LXXXVI. fig. 9. 
Oblong, body ventricose; spire very acute and subulate; 
aperture large and ovate; horn-coloured. Two inches long. 
Inhabits the ditches and ponds of Europe. 
Genus 67.—PHYSA.— Drapernaud. 
Generic Character. —Shell generally sinistral, convolute, oval, 
or oblong ; spire prominent ; aperture longitudinal, contracted 
above; columella twisted ; outer lip very thin, acute, partly 
obtruding above the plane of the opening ; destitute of an oper¬ 
culum. 
Physa fontinalis . —The Fountain Physa. 
Plate LXXXVI. fig. 6. 
Volutions reversed, oval, diaphanous, glossy, horn-coloured ; 
spire short and acute. Half an inch long. Inhabits the ditches 
and streams of Europe. 
