History of British animals - University of Guam Marine Laboratory

~ 180. B. aperta.— Shell smooth, with indistinct lines of growth ;291 MOLLUSCA. BRANCHIFERA. Bulla.179. B. alba.—* Shell oval, oblong;slightly striated longitudinally; entirely white ;crown umbilicate ;at each extremitythree transverse 1 ''puncturedstria?.Dr Turton, Zool. Journ. No. vii. 3G4. t. xiii. f. 6—British Channel.Dr Turton " adds, They are more elongated than the Bulla ampulla (thereference is evidently here intended for the B. stria/a of Lamarck, not to thetrue Ampulla), and essentially differ in having only three rather remote transversestrire at each end, whereas on the latter shell there are seven or eightstrife on the lower extremity, and none on the upper."** Shells probably concealed, destitute of a cuticle, and underthe integuments.suborbicular, depressed ; aperture expanded ; pillar short.Linn. Syst.i. 1183, Pult. Dorset. 40. Don. Brit. Shells, t. cexx. Mont-Test. Brit. 208. vig. ii. f. 1, 3 Not common.Length 1 inch, breadth f ths, thin, pellucid, white ;apex simple ; bodyslightly involuted. Animal pellucid, white, with minute opake specks ; stomachof three testaceous plates.181. B. punctata.— Shell suborbicular, patulous, moniliformlystriated longitudinally.Adams, Linn. Trans, v. 2. t. i. f. 6, 8.—B. catena, Mont. Test. Brit.215. vii.—On t. 7- f- the English coast, not common.Length about |th of an inch ; bre.adth rather less ;apex rounded, with acavity exposing a volution. Montagu mentions " a variety with a moretransparent zone, taking in eight or ten of the cateme, which are more stronglydefined the rest of the shell ;appears as it were frosted, and not so glossy,possessing a subumbilicus ; and the outer margin of the aperture, close to thebody, is winged, or reflected a little, forming a depression or sulcus on thatpart."182. B. emarginata.— Shell gibbous ; aperture emarginate ;pellucid, smooth ;lip subarcuated.Adams, Linn. Trans, v. 2. t. i. f. 9, 11. — On the English coast, rare.183. B. denticidata.— Shell white, pellucid, oblong, nearlyequal, obtuse, smooth ; outer lip ending in a tooth retrally.—Perhaps only the young of B. aperta.Adams, Linn. Trans, v. 1. t. i. f. 3, 6—Coast of Pembroke.184. ~B.Jlexilis.— Shell pellucid, horn-coloured ;apex white,opake, with a single volution.Laskey, Mont. Test. Brit. Supp. 1C8. Wern. Mem. i. 396. t. 8. f. 6Dunbar, rare.Length half an inch, wrinkled ; flexible in a moistened state ; brittle whendry.— This shell probably belongs to the genus Sigaritus.