S76 
MOLLUSCA, PULMONIFERA. 
Physav 
2. L. minima. — Elongated, smooth ; volutions rather convex ; aperture less 
than half the length of the shell, ovate ; last whorl not ventricose. Sower. 
Min. Conch, tab. 1G9, f. 1. — Fresh water formation. Isle of Wight. 
3. L. longiscata. — Elongated, smooth ; aperture ovate, elongated ; two-fifths 
the length of the shell ; plait upon the columella obscure. Sower. Min. Conch, 
tab. 343.— Upper fresh water formation, Headon Hill. 
4. L. maxima. — Ovate elongated, rather obtuse ; whorls about six, slight- 
ly concave ; aperture narrow, occupying less than half the length of the shell, 
Sower. Min. Conch, tab. 538. f. 1. — Fresh water formation, Isle of Wight. 
5. L. columellaris Ovate pointed ; spire short ; whorls about 5, convex ; 
aperture vvide, above half the length of the shell ; columella much twisted, 
and very thick. Sower. Min. Conch, tab. 528, f. 2. — Fresh water strata, Hord- 
well Cliff. 
6. L. pyramidalis — Ovate acute ; whorls convex ; aperture half as long as 
the shell, dilated ; plait of the pillar obscurely divided. Sower. Min. Conch, 
tab. 528, £ 3. — In the fresh water formation of Headon Hill, Isle of Wight. 
Gen. XXX. PHYSA. — Shell convoluted; aperture longitu- 
dinal ; peristome wanting in the body-whorl ; margin of the 
cloak loose, divided into lobes, and capable of being redect- 
ed over the surface of the shell, near the mouth. 
116. P.Jontinalis. — Whorls four, increasing suddenly from 
the apex to the body- whorl, which is very large. 
Buccinum exiguum. List. An. Ang. 142. Conch, tab. 134, f. 34 — Pla- 
norbis Bulla, Mull. Verm. ii. 167 — Bulla fontinalis, Linn. Syst. L 
1185. Mont. Test. Brit. 226. — Ph. font. Drap. Moll. 54. — Common 
in lakes and slow running streams. 
Length about half an inch ; pellucid, glossy, horn-coloured, with minute 
lines of growth ; whorls rounded ; aperture narrow behind ; the body-whorl 
projecting. Animal pale dusky yellow ; an interesting object when viewed 
crawling against the surface of the water, and extending its delicate, trans- 
parent, divided cloak over the surface of the shell. The P. alba of Dr Tur- 
ton, Zool. Journ. vol. ii. p. 363. t. xiii. f. 3, does not appear to be distinct. 
Gen. XXXI. APLEXA. — Shell convoluted ; peristome en> 
tire ; pillar- lip with a fold ; margin of the cloak entire, and 
incapable of being reflected over the shell. 
117. A. hypnojum.S^vcQ lengthened; aperture rounded an- 
teally. 
Bucc. heterostrophon. List. Conch, tab. 1059, £ 5 — Planorbis turritus, 
MulL Verm. Hist. ii. 169 — Bulla hypnor. Linn. Syst. i. 1185. — Turbo 
stagnalis, Walk. Test. Min. 15. tab. ii. f. 54, — Bulla hyp. Mont. Test. 
Brit. 228. — Not uncommon in lakes and slow running streams. 
Length upwards of half an inch, deep horn-colour, glossy, translucent ; 
whorls four or five, rather flat, the last one occupying two-thirds of its whole 
length aperture narrow behind, the outer-lip nearly straight ; pillar-lip thick, 
reflected. 
