Turbo. MOLLUSCA. PECTINIBRANCHIA. 
fi 99 
Length about |th of an inch ; bands about twelve, apparently interrupted, 
so as to give the surface a checkered appearance ; finely striated spirally. — 
Probably the fry of the preceding species. 
190 . T. mammillatus , — Whorls five, slightly rounded ; spi- 
rally striated with raised dots. 
Dm. Brit. Shells, t. clxxiii. — Scilly Bocks. 
Length and breadth nearly equal; aperture rounded, a few ridges of 
larger dots give to the whorls a subangulated form. According to a memo- 
randum in the handwriting of Da Costa, annexed to one of the specimens 
figured by Donovan, this shell has been found by Mr Platt on the Scilly 
Bocks. 
191. T. crassior . — Shell conical, yellowish- white, with five 
rounded and deeply divided whorls. 
Turbo Isevis, quinque anfractibus apertura subrotunda marginata, Walk. 
Test. Min. 10. t. ii. f. 34. — T. crass. Mont. Test. Brit. 309. t. xx. f. 1. 
— T. pallidus, Don. Brit. Shells, t. clxxvifi. f. 4 — Common in deep 
water. 
Length half an inch ; breadth j^ths ; covered with a pale epidermis, 
which rises in numerous sharp oblique ridges, beneath which are a few obsor 
lete spiral striae. The whorls are sometimes slightly flattened in the mid- 
dle ; they are thick and opake. Pillar-lip flattened anteally ; outer-lip thin, 
joining the body-whorl nearly at right angles. - 
192. T. quadrifasciatus. — Pillar with a groove, ending re- 
trally in a perforation. Shell striated spirally. 
Mmt. 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 horn- 
colour, with four dark spiral bands on the body, two of which enter the aper- 
ture, and two are external; between these pairs there is usually a whitish 
band, where the whorl bends in, rather suddenly, towards the pillar ; the outer- 
lip, at its junction with the whorl, covers a portion of this white space, the 
external part, however, is usually exposed, and appears as a white band along 
the line of separation ; the whorls are more or less rounded, and subcarinated 
on the body- whorl ; but in all, the surface is marked' by waved spiral strise, 
slightly decussated by the lines of growth. The outer-lip, when young, is 
thin ; but towards maturity it becomes thick, sloping outwardly to a sharp 
edge ; operculum membranaceous, smooth, yellowish. 
19 B. T. decussatus . — Whorls fiva^ rounded ; strongly striated 
transversely ; finely striated spirally. 
Mont. Test. Brit. 322. t. xii. f. 4. — 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 retraliy. 
194. T. maf'garita . — Whorls four, the first very large, pil- 
lar-cavity wide ; inside of the aperture with a mother-of-pearl 
gloss. 
Helix Marg. Laskey., Mont. Test. Brit. Supp, 143. Wern. Mem. i. 408. 
t. viii. f. 5.— Common on fuci. 
Breadth and height about one-eighth of an inch ; smooth glossy, greenish ; 
sometimes with one spiral rufous band ; when bleached, it is of a brownish- white 
colour ; whorls increase rapidly ; rounded, the spire short and blunt ; aperture 
