TURBO. 
Prate VI. 
Species 24. (Mus. Cuming.) 
Turgzo pica. Turd. testé orbiculari-conoided, crassa, pon- 
derosd, latissimé et profundé umbilicatd, anfractibus 
levibus, superné vix depressis ; intense nigra, maculis 
albis undatis strigatd, basi albd, intus margaritacea ; 
operculo corneo, tenui, spiraliter lineari-sulcato. 
Tue mMaGpic Turso. Shell orbicularly conoid, thick, 
ponderous, very broadly and deeply umbilicated, 
whorls smooth, slightly depressed round the upper 
part; intensely black, streaked with white waved 
blotches, white at the base, pearly within; operculum 
horny, thin, spirally linear-grooved. 
Linnaus, Syst. Nat. (12th edit.) p. 1235. 
Hab. Trinidad (on mud banks in rocky places); J. Cuming. 
This well-known species is chiefly remarkable from the 
circumstance of its having a thin horny operculum, on 
which account it is referred by some authors to the genus 
Trochus. In form it may be said to be intermediate 
between the two genera, having more particular affinity 
with the Zurbo Norrisii, which has been described as a 
new genus under the name Trochiscus. 
Species 25. (Mus. Cuming.) 
Turgpo ruGosus. Turd. testé orbiculari-conoided, imper- 
foraté, anfractibus spiraliter scabroso-striatis, superné 
plicis prominentibus coronatis, deinde carinatis, carind 
noduliferd, aut plane squamatd, squamis mucronatis ; 
sordidé ceeruleo-viridescente, intus argented, labro colu- 
mellari conspicue aurantio-rubente ; operculo crasso. 
Tue roucH TurBo. Shell orbicularly conoid, imper- 
forated, whorls spirally scabrously striated, coronated 
with prominent folds, then keeled, the keel being no- 
duliferous or flatly scaled, scales sharp-pointed ; dull 
bluish green, interior silvered, columellar lip conspi- 
cuously orange-red ; operculum thick. 
Linnaus, Syst. Nat. (12th edit.) p. 1234. 
Hab. Mediterranean ; Philippi. 
This species may easily be recognized by the deep 
orange-red colouring of its widely expanded columellar 
lip; the same colour is also imparted to the operculum. 
Species 26. (Mus. Cuming.) 
Turso toravatus. Turd. testd orbiculari, depressiusculd, 
late et profundé umbilicatd, anfractibus spiraliter lira- 
tis, longitudinaliter creberrimé lamellatd, superné api- 
cem versus peculiariter plano-excavatis, deinde nodula- 
tis, fossé etate labrum versus evanidd ; olivacedé et 
viridescente ; operculo testaceo, circulariter sulcato. 
THE COLLARED TuRBO. Shell orbicular, rather depressed, 
widely and deeply umbilicated, whorls spirally ridged, 
longitudinally very closely lamellated, peculiarly flatly 
excavated round the upper part towards the apex ; 
then noduled, the excavated trench disappearing 
towards the lip with age ; olive and greenish ; oper- 
culum testaceous circularly grooved. 
GMELIN, Syst. Nat. p. 3597. 
Var. sulcata. Turbo lamellosus, Broderip. 
Hab. Isle of Budche, West Coast of New Holland; Scott. 
New Zealand ; Earl. 
A careful observation of this species has convinced me 
that the circular trench which is so strongly developed in 
some varieties, and by which Mr. Broderip characterized his 
T. lamellosus (Zool. Journ. vol. v. p. 331. supp. plate xliv. 
f. 2.), varies with circumstances. In the most purely 
convex state of 7’. torguatus there is some faint indication 
of this grooved structure about the apex, and it is a uni- 
versal law in the growth of spiral shells, especially in 
individuals of the genus under consideration, that sculp- 
ture, however precise and forcibly developed in the first 
few whorls, becomes gradually fainter and more diffuse 
towards maturity. 
February, 1848. 
