TROCHUS. 
Prate VII. 
Species 31. (Mus. Cuming.) 
Trocuus Ampricanus. Zroch. testé imperforatd, sub- 
pyramidali-conicd, solidiusculd, albidi ; anfractibus 
plano-declivibus, longitudinaliter subtiliter-nodosé cor- 
rugato-liratis, ad marginem abrupte turgidis, rotunda- 
tis, livis subprominentioribus, suturis impressis ; basi 
rudé granoso-lirata, circa umbilicum incrassatd. 
Tue American TRocuus. Shell imperforate, somewhat | 
pyramidally conical, rather solid, whitish; whorls 
flatly sloping, longitudinally finely nodosely wrinkle- 
ridged, abruptly bulging and rounded at the margin, 
with the ridges rather more prominent, sutures im- 
pressed; base rudely granosely ridged, thickened 
round the umbilicus. 
GMELIN, Syst. Nat. p. 3581. Chemn. Conch. Cab. vol. v. 
p. 33. pl. 162. f. 1534, 1535. 
Hab. Florida. 
The basal margin of the whorls are not augled in this 
species, but turgidly rounded; and the sculpture con- 
sists of a regular succession of finely noduled wrinkle- 
ridges. 
Species 32. (Mus. Cuming.) 
Trocuus CuBanus. TZroch. testd imperforatd, conicd, 
spadiceo-alba ; anfractibus convexo-declivibus, obsolete 
corrugato-striatis, medio plicato-nodatis, ad marginem 
plicato-squamatis ; squamis occlusis, digitatis, con- 
spicué descendentibus, basi sparsim granatd, circa um- 
bilicum incrassata. 
Tue Cusa Trocuvs. Shell imperforate, conical, fawn- 
white ; whorls concavely sloping, obsoletely wrinkle- 
striated, plicately noduled in the middle, plicately 
sealed at the margin; scales closed, digitate, con- 
spicuously descending. 
Puitippt, Zeitschr. fiir Malac. 1848. p. 104. 
Hab. Central America. 
Chiefly distinguished by the descending digitate cha- 
racter of the basal marginal scales. 
Species 33. (Mus. Cuming.) 
TROCHUS COLUMELLARIS. Tyoch. testd imperforatd, conica, | 
virente-alba ; anfractibus oblique subobsoleté corrugato- 
striatis, ad marginem plicato-squamatis ; squamis con- 
spicue descendentibus, muricatis ; basi dense minutis- 
simé imbricata, circa umbilicum callosd, caruleo- 
virente. 
THE COLUMELLAR Trocuus. Shell imperforate, conical, 
ereenish-white ; whorls obliquely rather obsoletely 
striated, plicately scaled at the margin, scales con- 
spicuously descending, prickly ; base densely very 
minutely imbricated, callous blue-green around the 
umbilicus. 
Puitippr, Abbild. und Besch. Conch. vol. 2. p. 35. pl. 
flo Bb 
Hab. Australia. 
Closely allied to 2. rhodostoma, but always distin- 
cuished from that species in being more finely sculptured, 
and in not having a double row of marginal scales, while 
the callosity around the umbilicus, instead of being a deep 
crimson-lake, is of a blue-green verdigris colour. 
Species 34. (Mus. Cuming.) 
Trocuus cmiatyus. Troch. testé imperforatd, obeso- 
conoided, flavescente-lacted, versus apicem viridi varie- 
gata; anfractibus superné concavis, oblique imbricato- 
plicatis, inferné rotundatis, triseriatim muricato-squa- 
matis ; bast convexd, validée imbricato-costatd. 
Tuer carved Trocuus. Shell imperforate, stoutly co- 
noid, yellowish cream-coloured, variegated with green 
towards the apex; whorls concave round the upper 
part, obliquely imbricately plicated, rounded at the 
lower, encircled with three rows of prickly scales ; 
base convex, strongly imbricately ribbed. 
Cuermnitz, Conch. Cab. vol. v. p. 33. pl. 162. f. 1536, 
1537. 
Hab. West Indies. 
This fine species, the most abundant of the group, is 
well distinguished by its basal fringe of prickly scales. 
Species 35. (Mus. Cuming.) 
TrocHus RHODosToMA. Troch. testd imperforatd, conicd, 
alba ; anfractibus acute declivibus, oblique rudé plicato- 
corrugatis, ad marginem acutangulis, biseriatim spinoso- 
November, 1861. 
