History of British animals - University of Guam Marine Laboratory

Mi) MOLLUSC A. BUCCINID.E. MomcnGen. MORIO.— Aperture longitudinal, narrow, ending in arecurved canal.1. ~M.carina.tus.— Shell pyriform ;spire short; volutions depressed, angular,with many longitudinal striae, and three nodose ridges.— (Bueeinum nodosum,Brander, front. No. 131).— Cassis car. Sower. Min. Conch, t. vi.; the threeupper figures. — London Clay.Gen. LXXII. NASA.— Spire produced ;canal very short,obliquely truncated.— 308. N. reticulata. — Outer lip simple externally; the longitudinalridges decussated by narrow, deep, spiral grooves.Buc. cancellatum, List. Conch, t. Dcccclxvi. f. 21.— B. reticul. Linn. Syst.i. 1204. Penn. Brit. Zool. iv. 122. t. lxxii. f. 92. Mont. Test. Brit.240.— Not uncommon.Length an inch and a half; breadth three quarters; of a brownish colour;whorls seven or eight, rather flat ; aperture lengthened outer ; lip nearly—straight retrally inner ; lip slightly tuberculated. This shell is subject toslight variations in the relative size of the ribs.309. N. i7ic)-assata.— Outer lip thickened by a strong externalrib ;whorls slightly rounded ; longitudinal ridges decussatedby narrow flattened spiral ridges.Tritonium incrass. Mull. Zool. Dan. Prod. 244, No. 2946—Buc minutum,Penn. Brit. Zool. iv. 122. t. 79—B. macula, Mont. Test Brit.241. t. viii. f. 4. Near low water-mark, common.Length half an inch ;breadth above a quarter ; colour various, mottled ;whorls six or seven ; aperture orbicular ;outer lip rounded, denticulated, witha short tooth at the junction with the margin of the canal; inner lip concave,faintly tuberculated ; canal with a black end. Dr Turton notices two varieties,A having the outer lip thin, and not toothed on the inside, and B " witha notch or cut at the upper angle of the outer lip, separating it from its attachmentto the body volution, similar to that which is found in the Murexgracilis."— Conch. Diet. 15. He has likewise described a very common varietyof this shell, with the pillar white externally, under the title Tritonia varicosa,Zool. Journ. No. vii. 3G5. t. xiii. f. 7-310. N. ambigua.— Outer lip thickened by a strong externalrib ; whorls slightly depressed towards the junction;the longitudinalridges decussated by numerous spiral striae.Buc. amb. Pult. Dorset. 42. Mont. Test. 242. t. ix. f. 7 —On the Englishand Irish coasts, not common.Length half an inch, breadth three-eighths white, whorls six, with from;eleven to fifteen ribs ; aperture suborbicular ; outer lip denticulated, with anobsolete tooth at the canal ;outer lipwuh two distant folds.311. N. cincta.— Outer lip thickened by a strong externalrib ;whorls nearly even ;interstices of the ribs obsoletelystriatedspirally.Buc. cinctum, Mont. Test. 246. t. xv. f. 1.—Found at Weymouth, MrBryer.Length about a quarter of an inch ; white, with a rufous spiral band ;whorls