TROCHUS. 
Puate I. 
Genus TROCHUS, Linneus. 
Testa pyramidali-conica, basi planata, sepissimé vivide co- 
lorata, anfractibus plerumque granatis, interdum tu- 
berculatis ; apertura depressd, labro simplici; colu- 
mellé arcuatd, interdum contortd aut dentatd. Opercu- 
lum corneum. 
Shell pyramidally conical, flattened at the base, mostly 
bright-coloured, whorls generally grained, sometimes 
tubercled; aperture depressed, lip simple; colu- 
mella arched, sometimes twisted or toothed. Opercu- 
lum horny. 
Under the head of Zrochus I include, in addition to the 
type represented by Z. xiloticus, the following twelve 
genera of Gray and Adams :—Stella, Lithopoma, Guild- 
fordia, Chrysostoma, Balma, Modelia, Polydonta, Tectus, 
Pomaulax, Astralium, Pachypoma, and Uvanilla. Other 
groups of the great family of Trochide will follow as fa- 
cilities of procuring specimens are afforded me. 
With the exception of one or two species inhabiting 
the seas of Central America, at Panama, California, and 
the West Indies, they are all natives of the shores of the 
Eastern and Pacific Islands and Australia. 
Fig. 1. (Mus. Cuming.) 
TRocHUS FLAMMULATUS. For description of this 
species see Plate XII. Species 70, where the specimen 
figured is a red-flamed variety. In the specimen figured 
in the accompanying Plate, the flames are a greenish- 
olive, passing into olive-red at the base. The sculpture, 
characteristic in both, consists of an unusually large row 
of granules next the sutures, and a multitude of fine ob- 
lique wrinkles occupying the place of granules, below 
them. 
Species 2. (Mus. Cuming.) 
Trocuus Hanuryanus. Zroch. testd subacute conicd, ex- 
cavato-umbilicatd, virescente-albd, intense viridi aut 
purpureo copiosissime obliqué lineatd, circu wmbilicum 
purpurascente tinctd, anfractibus concavo-declivibus, 
sparsim granulatis, ad marginem inferiorem plicato- 
tuberculatis, basi circulariter obsolete granoso-liratd. 
Han.ey’s Trocuus. Shell rather sharply conical, ex- | 
cavately umbilicated, greenish-white, very copiously 
obliquely lineated with dark-green or purple, tinged 
with purple around the umbilicus, whorls concavely 
sloping, sparingly granulated, plicately tubercled at 
the lower margin, circularly obsoletely granosely 
ridged. 
Rezvs, Pro. Zool. Soc. 1842, p. 184. Conch. Syst. vol. ii. 
pl. 218. f. 11. 
Trochus lineatus ? Lamarck (not of Da Costa). 
Hab. Australia. 
The shell figured by Philippi for this species in Kuster’s 
Conch. Cab. is my 7. nigro-punctatus. It may be La- 
marck’s 7. lineatus, but there is no certainty of it, and 
that name had been already used by Da Costa. 
Species 3. (Fig. a, 6, Mus. Cuming.) 
Trocuus ninoticus. rock. testéd pyramidali-conicd, 
basi interdum crassé dilatatd, subsuperficialiter exca- 
vato-umbilicatd, rosac¢o-albd, nigricante-sanguineo ra- 
diatim flammatd, anfractibus plano-declivibus, oblique 
sparsim granatis, ad marginem inferiorem plicato-tu- 
berculatis, granis et tuberculis in anfractu ultimo ob- 
soletis, basi concavo-pland, circulariter tenuiliratd, san- 
guineo-roseo maculata et flammata. 
Tue WATER-FLOWING TrocuHus. Shell pyramidally coni- 
cal, sometimes thickly dilated at the base, rather 
superficially excavately umbilicated, rose-white, radi- 
ately flamed with black blood-colour, whorls flatly 
sloping, obliquely sparingly grained, plicately tu- 
bercled at the lower margin, grains and tubercles ob- 
solete in the last whorl, base concavely flattened, cir- 
cularly finely ridged, spotted and flamed with blood- 
rose. 
Linnaus, Syst. Nat. p. 1227. 
Hab. Eastern Seas. 
This well-known species is sculptured on the first few 
whorls with granules and marginal plicated tubercles, but 
gradually they become more feebly developed and soon 
obsolete. The base of the last whorl is sometimes dilated 
in a curiously swollen manner. The name appears to be 
derived from a fancied resemblance of the painting to 
flowing streams. 
June, 1862. 
