History of British animals - University of Guam Marine Laboratory

274 MOLLUSCA. PULMONIFERA. Limnea,Helix detrita, Pult. Dorst. 49. Mont. Test. Brit. 384, tab. xi. f. 1In England and Ireland.Length fths of an inch; lines of growth numerous, fine, with minute longitudinalstriae, sometimes plain or with one, two, or three brown bands ;whorls nearly flat ; aperture narrow ; pillar-lip reflected, forming a distinctcavity behind. Mr Bryer found this shell in a pool near Weymouth, and ina stream near Dorchester. Dr Turton adds, that it is found at Dublin.Judging from English and foreign specimens sent to me by the late Rev.James Lambert senior, Fellow of Trinity College, Cambridge, I am inclined toconsider the Helix detrita of Pultney, and the Bulimus radiatus of Drapernaud,as distinct species, the latter being a land shell.108. L. palustrls.— Shell brown ;whorls six, taperingto asharp point.Bucc. minus fuscum, List. An. Aug. 139. Conch, tab. 124. f. 24.— H.stagnalis, var. B., Penn. Brit. Zool. iv. 139.—H. pal.MonL Test. Brit.370, tab. xvi. f. 10 H. fragilis et fontinalis, Don. Brit. Shells, tab. 175,f. 1, 2.—In ditches and swamps. Common.Length about fths of an inch, with numerous lines of growth, and longitudinalwrinkles ;whorls rounded ; peristome thickened, purplish.109. L. octona.— Whorls eight;shell subcylindrical, pointed.Helix octona, Linn. Svst. i. 1248.—Bucc. glabrum, Mull. Verm. ii. 135.H. oct. Penn. Brit. Zool. iv. 138, tab. lxxxvi. f. 135. Pult. Dorst. 49.— H. octanfracta, Mont. Test. Brit. 396, tab. xi. f. 8.— L. elongatus,Drap. Moll. 53 In slow running ditches.Length fths, breadth of the body-whorl about Ath of an inch ; yellowish-brown;whorls rather flat, striated across ;mouth narrow ; fold on thepillar elevated. Animal dusky foot short ; ;tentacula narrow, flat ; eyes atthe internal base, in a shallow cavity, covered by a small protuberance, resemblingthe rudiments of tentacula. This seems a very local species. Mon-found it in Cornwall ; and it has occurred to me in several ditches in thetaguupper part of Linlithgowshire. The Physa scaluriginum of Drapernaud,(Moll. 56), and named as British by Dr Turton (Zool.' Journ.N'. VIII. 565.)seems to be only the young of this species.— 110. L.Jhssaria.— Whorls five, rounded; pillar-lip broad, reflected.H. foss. Mont. Test. Brit. 372, tab. xvi. f. 9.— In shallow muddy pools.Common.Length |thsof an inch whorls ;increasing more rapidly than in the precedingstriated across, and wrinkled longitudinally ; ; sepai'ating line deep mouth;wide ; lip, in descending on the pillar, broad and reflected, exhibiting theoblique fold very indistinctly—This is probably the Turbo striatus quatuoranfractibus apertura ovali marginata of Walker, Test. Min. tab. ii. f. 57, calledT. rivulus, by Montagu, and Limnea minuta by Drap. Moll. 53.— This speciesand the L. octona frequently creep out of the water, and. remain for sometime in a quiescentstale.** Shell vcntr'icose.111. L. Ihnosa.— Whorls five; the first four rounded; mouthslightly contracted.H. lim. Linn. Syst.i. 1249.—Bucc. peregrum, Mull. Verm. ii. 130.—H.putris, Penn. Brit. Zool. iv. 139, tab. lxxxvi. f. 137—H. peregra.