History of British animals - University of Guam Marine Laboratory

.cloak276' MOLLUSCA. PULMONIFERA. Physa.2. L. minima.— Elongated, smooth ; volutions rather convex ;aperture lessthan half the length of the shell, ovate ; last whorl not ventricose, Sower.Min. Conch, tat). 169, f. 1. — Fresh water formation, Isle of Wight.3. L. longiscata.— Elongated, smooth ; aperture ovate, elongated; two-fifthsthe 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, slightlyconcave; 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 wide, above half the length of the shell ;columella much twisted,and very thick, Sower. Min. Conch, tab. 528,— f. 2. Fresh water strata, HordwellCliff.G. L. pyramidalis.— Ovate acute ; whorls convex ; aperture half as long asthe shell, dilated 3— ; plait of the pillar obscurely divided, Sower. Min. Conch,tab. 528, f. In the fresh water formation of Headon Hill, Isle of Wight.Gen. XXX. PHYSA.— Shell convoluted ;aperture longitudinal;peristome wanting in the body-whorl margin of the;loose, divided into lobes, and capableof being reflectedover the surface of the shell, near the mouth.116. P.jbnt'inalis.— Whorls four, increasing suddenly fromthe apex to the body- whorl, which is very large.Buccinum exiguum, List. An. Ang. 142. Conch, tab. 134, f. 34 PlanorbisBulla, Mull. Verm. ii. 167 Bulla fontinalis, Linn. Syst. L1185. Mont. Test. Brit. 226—Ph. font. Drap. Moll. 54.—Commonin lakes and slow running streams.Length about half an inch ; pellucid, glossy, horn-coloured, with minutelines of growth whorls rounded ; ; aperture narrow behind ;the body-whorlprojecting. Animal pale dusky yellow ;an interesting object when viewedcrawling against the surface of the water, and extending its delicate, transparent,divided cloak over the surface of the shell. The P. alba of Dr Turton,Zool. Journ. vol. ii. p. 363. t. xiii. f. 3, does not appear to be distinct.Gen. XXXI. APLEXA.— Shell convoluted ; peristome entire;pillar- lip with a fold ;margin of the cloak entire, andincapable of being reflected over the shell.117. A. hypnorum.— Spire lengthened; aperture rounded anteally.Bucc. heterostrophon, List. Conch, tab. f.1059, 5.—Planorbis turritus,Mall. Venn. Hist. ii. 169.— Bulla hypnor. Linn. Syst.i. 1185.— Turbostagnalis, Walk. Test. Min. 15. tab. ii. f. 54,— Bulla hyp. Mont. TestBrit. 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 wholelength ; aperture narrow behind, the outer-lip nearly straight ; pillar-lip thick,reflected.