History of British animals - University of Guam Marine Laboratory

,T.Turbo. MOLLUSCA. PECTINIBRANCHIA. 299Length about |th of an inch ;bands about twelve, apparently interrupted,so as to givethe surface a checkered appearance; finely spirally—striatedProbably the fry of the preceding species.190. TV mammillatus.— Whorls five, slightly rounded ; spirallystriated with raised dots.clxxiii— Don. Brit. Shells, t.Scilly Rocks.Length and breadth nearly equal; aperture rounded, a few ridges oflarger dots give to the whorls a subangulated form. According to a memorandumin the handwriting of Da Costa, annexed to one of the specimensfigured by Donovan, this shell has been found by Mr Piatt on the ScillyRocks.191. T. crassior.— Shell conical, yellowish- white, with fiverounded and deeply divided whorls.Turbo lsevis, quinque anfractibus apertura subrotunda marginata, Walk.Test. Min. 10. t. ii. f. 34 T. crass. Mont. Test. Brit. 309. t. xx. f. 1.pallidus, Don. Brit. Shells, t. clxxviii. f. 4—Common in deepwater.Length half an inch 3;breadth i 5 ths ;covered with a pale epidermis,which rises in numerous sharp oblique ridges, beneath which are a few obsoletespiralstrise. The whorls are sometimes slightly flattened in the middle; they are thick and opake. Pillar-lip flattened anteally ; outer-lip thin,joining the body-whorl nearly at right angles.- 192. T. quadrifascmtus.— Pillar with a groove, ending retrallyin a Shell striatedperforation.spirally.Mont. Test. Brit. 328. t. xx. f. 7— T. vinctus, ib. 307- t. xx. f. 3—T.canalis, ib. 309 Among sea-weeds, a little beyond low water-mark,common.Length from three to five-tenths of an inch, glossy, of a yellowish horncolour,with four dark spiral bands on the body, two of which enter the aperture,and two are external ; between these pairs there is usually a whitishband, where the whorl bends in, rather suddenly, towards the pillar; the outerlip,at its junction with the whorl, covers a portion of this white space, theexternal part, however, is usually exposed, and appears as a white band alongthe line of separation ;the whorls are more or less rounded, and subcarinatedon the body-whorl but in ; all, the surface is marked by waved spiral strise,slightly decussated by the fines of growth. The outer-lip, when young,isthin ; but towards maturity it becomes thick, sloping outwardly to a sharpedge operculum membranaceous, smooth, yellowish.;193. T. decnssatus.— Whorls five, rounded ; strongly striatedtransversely ; finely striated spirally.Mont. Test. Brit. 322. t. xii. 4.— f.Among shell-sand, rare.Length about the eighth of an inch, breadth one-half less ; white, glossy ;apex rather blunt ; aperture suboval, a little contracted retrally.— 194. T. margarita.— Whorls four, the first very large, pillar-cavitywide ;inside of the aperture with a mother-of-pearlgloss.Helix Marg. Laskeij, Mont. Test. Brit. Supp. 143. AVern. Mem. i. 408.t. viii. f. 5 Common on fuci.Breadth and height about one-eighthof an inch ; smooth glossy, greenish;sometimes with one spiral rufous band ;when bleached, it is of a brownish-whitecolour ;whorls increase rapidly ; rounded, the spire short and blunt ; aperture