TROCHUS. 
Puate VI. 
Species 27. (Mus. Cuming.) 
Trocuus Cooxianus. Troch. testd imperforatd, tumido- 
conoided, sordidé fusca, versus apicem livido-ened ; 
anfractibus rotundatis, oblique costatis, costes imbricato- 
squamosis regularibus, striis incrementi lamelliforme- 
bus densé oblique decussatis ; basi medio concavd, circa 
columellam fulvo-spadiced, versus marginem convexius- 
culd, densé imbricato-lirata. 
Coox’s Trocuus. Shell imperforate, tumidly conoid, 
dingy brown, livid copper-green towards the apex; 
whorls rounded, obliquely ribbed, ribs imbricately 
scaled, regular, densely obliquely decussated with 
lamelliform striz of growth; base concave in the 
middle, fulvous-fawn-colour round the columella, 
convex towards the margin, closely imbricately 
ridged. 
Trochus Cookianus ex Freto Cookiano Zeelandie-Nove, 
Chemnitz. 
Trochus sulcatus, Martyn. 
Trochus Cookit, Gmelin. 
Hab. New Zealand. 
This well-known species, originally named by Chemnitz 
after one of its habitats, which habitat, Cook’s Strait, New 
Zealand, was named after our old navigator Captain Cook, 
illustrates in a conspicuous manner the obliquely decussa- 
ting sculpture common to the Zyochi. The ribs and ridges 
of the Zrochi do not correspond with the rings of the Sca- 
larie,—which are analogous to the varices in the shells of 
the Murices and other genera of Canalifera, and run pa- 
rallel with the margin of the aperture,—but are formed in 
the contrary direction. 
Species 28. (Mus. Cuming.) 
TROCHUS LONGISPINA. Troch. testé subampliter profunde 
umbilicatd, plus minus depressée conoided, lacted, au- 
reo-ferrugineo varie tinctd ; anfractibus superné con- 
vexis, deinde concariusculis, rugis crispatis crenulatis 
oblique promiscue sculptis, ad marginem radiatim pla- 
nisquamatis ; bast convexd, radiatim pulcherrimé densé 
striato-lamellata, circulariter obscure trilirata. 
THE LONG-SPINED TRocuus. Shell rather largely deeply 
umbilicated, more or less depressly conoid, cream- 
colour, variously stained with golden rust; whorls 
convex at the upper part, then rather concave, ob- 
liquely promiscuously sculptured with crenulated 
crisped wrinkles, radiately flatly scaled at the margin; 
base convex, radiately very beautifully densely stri- 
ately lamellated, circularly obscurely ridged. 
Lamarck, Anim. sans vert. vol. ix. p. 122. 
Trochus solaris Indie, Chemnitz (not Trochus solaris, 
Linneus, which is Phorus solaris). 2 
Calcar majus, Chemnitz. 
Trochus heliacus, Philippi. 
Trochus aster, Philippi. 
Astralium longispinum, Adams. 
Hab. West Indies. 
This very beautifully sculptured and well-known West 
India species varies in the more obtuse or more prickly 
development of the marginal scales, and in its more de- 
pressed or more elevately conical plan of convolution. 
By a corresponding correlation of growth the umbilicus, 
as a general rule, is more widely open in the depressed 
than in the conical forms, but it may be partially closed 
over in either form by an overlaying of the adjoining lp. 
Species 29. (Mus. Cuming.) 
TrocuHus costuLatus. Zroch. testé obtecté umbilicata, sub- 
laté conicd, fulvescente, pallide ferrugineo tincta ; an- 
Jractibus declivi-conveais, striis obliquis lineisque trans- 
versis granosis sculptis, ad marginem radiatim plani- 
squamatis, squamis breviusculis ; basi convend, radi- 
atim densé striato-lamellatd, circulariter obscuré qua- 
drilirata. 
THE FINE-RIBBED Trocuus. Shell with a covered um- 
bilicus, rather broadly conical, fulvous, faintly tinged 
with rust; whorls slopingly convex, sculptured with 
oblique strize and transverse granose lines, radiately 
flatly scaled at the margin, scales rather short; base 
convex, radiately densely striately lamellated, circu- 
larly obscurely four-ridged. 
Lamarck, Anim. sans vert. vol. 9. p. 127. 
Hab. West Indies. 
Constantly distinct from 7. longispina, though many 
would be disposed to regard it as only a modified form of 
that species. The longitudinal sculpture is more subdued, 
November, 1861. 
