History of British animals - University of Guam Marine Laboratory

Scalaria. MOLLUSCA. PECTINIBRANCHIA. 311Gen. MONODONTA.— Pillar-lip notched or suddenlyindented,so as to exhibit an imperfect canal.1. M. muricatus.— Short, conical, whorls 5, with many equal muricatedspiral ridges ; lip plaited. —Turbo mur. Sower. Mm. Conch, t. cclx. f. 4.—CoralRag.Gen. LII. SCALARIA.— Spire produced; transverse ridgeson the body-whorl continuous with the pillar.- 259- S. Clathrus. — Whorls 10, pointed, crossed by aboutten regular continuous ribs ; the intermediate spaces smooth.Cochlea variegata, List. Conch, t. nlxxxviii. f. 51. Bor. Corn. 276. t.xxviii. f. 9.— Turbo clath. Perm. Brit. Zool. iv. 129. t. lxxxii. f. 3. d.t. 3. a.— T. clathratulus, Don. Brit. Sh. t. xxviii. upper figures—Notcommon.Length about an inch and a half, breadth at the base half an inch ; colourusually white ; volutions rounded ; deeply divided by the separating line,across which the ribs are extended ; pillar behind imperforated. The bodywhorlis destitute of the keel-like spiral ridge which distinguishes the S. lamellosaof Lamarck, a species confounded with the preceding by Linnaeus.Animal mottled black and white ;discharges a purple dye snout ; produced ;tentacula slender, black ; operculum coriaceous, black and spirally striated.260. S. clathratulus.— Whorls 8, obtuse, crossed by upwardsof 15 regular continuous ribs, the intermediate spaces smooth.List. Conch, t. Dlxxxviii. f. 51. lower figures.— Turbo clath. Walk. Test.Min. 12. t. ii. f. 45. Maton and Racket, Linn. Trans, viii. t. v. f. 1.—Mont. Test. Brit. 297 Not common.Length about half an inch, breadth about T%ths ; like the preceding, butmore slender in its growth, the ribs more numerous and less elevated.— 261. S. Turtoni. — Whorls about 12, pointed, crossed byabout asmany ribs, interrupted by a separating line ; the intermediatespaces spirallystriate.Turba clathratus var. Don. Brit. Shells, t. xxviii, the lowest figure.— T.Turtoni, Turton, Conch. Diet. 208. f. 97 On the Irish and Englishcoasts.Length two inches and a half, breadth three-quarters of an inch ; palebrown, with two or three spiral dark bands. Shell strong; whorls rounded ;the ribs are but little raised, rounded, bent at the line of separation ; some arelarge, and longitudinally wrinkled ; lips white, pillar-lip a little reflected.In a paper by Mr Winch on the Geology of Lindisfarn, (Annals of Phil.xx. 434.) there is a notice of a recent species of this genus from the neighbouringsea, and which is there " designated, Scalaria Trevetyana, LeachMS." I have not seen any specimens, or met with any description of thisspecies.EXTINCT SPECIES.1. S. similis.— Whorls about 7, contiguous; spire with 5 or 6 rounded transverseelevations, close to each other, and somewhat decussated, the lowest