S98 MOLLUSCA. PECTINIBRANCHIA. Turbo. 
Gen. XL VI I. TURBO.-— Shell ovoid, the body-whorl oc- 
cupying upwards of one-half of the length ; aperture with 
the peristome incomplete retrally ; pillar-lip flattened. 
185. T. littoreus. Periwinkle. — Whorls five, separating 
line shallow ; outer-lip joining the body at an acute angle. 
Coclilea fusca, List. An. Ang- 162. Conch. 585. f. 43.— Turbo lit. Linn. 
Syst. Nat. i. 1232. Mont. Test. Brit. 301 — Common within tide-mark. 
Length about an inch ; breadth three quarters, various in colour, dusky, 
with lighter stripes, or with a white band, or orange-yellow ; apex blunt, nearly 
smooth or spiraUy striated ; animal striped with black, the tentacula annu- 
lated Extensively used as food. Mr Sowerby has figured a shell which he 
considers as identical with this species, and another similar to T. rudis^ (Min. 
Conch, t. 71-)? as from the Cra^r formation. We are inclined, in this instance, 
to suspect, that some products of a deposition of modern marine diluvium have 
been confounded with the genuine inmates of the Crag. 
186. T.petreus . — Whorls five, conical, nearly flat ; outer- 
lip joining the body at an acute angle, and embracing a portion 
of the whorl. 
Helix pet. Mont. Test. Brit. 403 — South coast of England. 
Length about /oths, breadth ^^gth of an inch, of a dark brown colour ; des- 
titute of spiral striae, but is marked transversely by irregular minute lines of 
g rowth ; pillar-lip remarkably broad, grooved anteally ; outer-lip thin ; body- 
p slightly convex — This species, according to Montagu, lives on the rocks 
a little below high water-mark. 
187. T. 7'udis . — Whorls five, rounded ; outer-lip thick, join- 
ing the body nearly at right angles. 
Maton, Don. Brit. Shells, t. xxxiii. Mont. Test. Brif. 304. — T. jugo. 
sus, ib. 586. Maton and Rackett^ Linn. Trans, viii. 158. — Common. 
Length and breadth nearly equal ; colour yellowish or browm ; separating 
line deep. The surface of the whorls is, in some individuals, nearly smooth, 
except by the markings of the lines of growth, constituting the T. rudis ; 
while, in others, the surface is grooved by spiral lines, the intermediate spaces 
flat or sharp edged, becoming the T, jugosus. The colours of the animal are 
usually plain.— The form and mode of junction of the outer-lip with the 
body seem the distinguishing features of the species. 
188. T. tenebrosus.-^Whorh five, rounded ; outer-lip thin, 
joining the body-whorl nearly at right angles. 
Mont. Test. Brit. 303. Turt. Conch. Diet. 197 — On the English and 
Irish coasts. 
Length fths, breadth fths ; separating line distinct ; colour dark purple, 
with yellowish spiral bands ; lines of growth minute, finely or coarsely striat- 
ed spirally. — This species is found on mud near high water-mark, and in 
brackish marshes. 
189. T. fabalis . — “ Subglobular, very obtuse, smooth, with 
three hardly produced volutions, of a chesnut colour, with ob- 
scure pale bands ; pillar and throat chesnut.” 
Turton, Zool. Journ. ii. 366. t. xii. f. 10. — On the rocks at Scarborough, 
Mr Bean. 
