Turbo. 
MOLLUSCA. 
253 
2. Fusus clatiiratus. —The Ladder Fusus, pi. XXXIII.* 
tig. 42. 
F. clathratus. Sowerby, Geo. Tr. 2nd Ser. IV. p. 344, pi. 
18, fig. 19. 
Somewhat pyriform; spire short; body large; longitudinally 
ribbed and striated; four narrow, waved, transverse ribs divide 
the surface of each volution into three portions resembling 
cells; aperture rather wide. 
The Greensand, Blackdown. 
3. Fusus rusticus. —The Rustic Fusus, pi. XXXIII.* figs. 
40, 41. 
F. rusticus . Sowerby, Geo. Tr. 2nd Ser. IV. p. 344, pi. 18, 
fig. 18. 
Short, rather ventricose; spire short, with four or five rounded 
volutions, which, as well as the body, are crossed by ten to 
twelve prominent knobbed longitudinal ribs, giving a square¬ 
ness to the sides; whole surface transversely striated ; aperture 
obliquely elongated, contracted both above and below; pillar-lip 
reflected. 
The Greensand, Blackdown. 
4. Fusus quadratus. —The Squarish Fusus, pi. XXXIII.* 
fig. 83. 
F. quadratus. Sowerby, Geo Tr. 2nd Ser. IV. p. 343, pi. 
18, fig. 17. 
Fusiform; body and spire forming reverse cones from the 
centre of the body, which is square, with two obscure transverse 
keels; spire with four volutions, about a fourth of the length 
of the shell; base acute; the whole covered with wide-set thin 
stria*; aperture sub-rhomboidal. 
The Greensand, Blackdown. 
5. Fusus rigidus. —The Rigid Fusus, pi. XXXIII.* figs. 
36, 37, 38. 
F. rigidus. Sowerby, Geo. Tr. 2nd Ser. p. 343, pi. 18. f. 10. 
Elongated, fusiform, with five or six volutions; body length¬ 
ened ; spire occupying about a third of the shell; the whole 
covered with longitudinal moderately prominent roughened ribs, 
ventricose in the middle ; compressed above, and transversely 
striated; aperture elliptical, rather more than half the length 
of the shell, and contracted both above and below; beak va¬ 
riously elongated, with its edge sometimes a little reflected. 
The Greensand, Blackdown. 
0. Fusus imbricatus. —The Imbricated Fusus, pi. XXXIII.* 
figs. 70, 71. 
F. imbricatus. Brown, Wern. Mem. VIII. pi. 1, figs. 5, 6. 
Turreted, with six volutions, flattened above; spire abruptly 
tapering to an acute apex; the whole with broad, lamellar, un¬ 
equally long thin ribs, broadest above, and slightly inflected at 
the edges, terminating at the base of the body in front, and 
running to the point of the back behind; aperture semi-ovate, 
rounded above and contracted below, slightly twisted to the 
right; pillar-lip broad, well defined, and replicate at its base; 
outer-lip thin and slightly reflected. 
The Pleistocene Marine Formation, Dalmuir, on the Clyde. 
1. Cancellaria minuta. —The Minute Cancellaria, pi. 
XXXIII.* fig. 73. 
Turreted; spire shorter than the body, with three volutions; 
aperture oblong, somewhat contracted; surface with considerably 
raised smooth longitudinal ribs, the interstices with transverse 
stria). 
1. Pleurotoma articulata. —The Articulated Pleurotoma, 
pi. XXXVII.* fig. 20. 
P. articulata. Sowerby, Sil. Syst. p. 612, pi. 5, fig. 2. 
Turreted, with eight or ten very convex, deeply divided 
volutions, with the sinus nearly in the middle, forming rather 
a broad band; surface smooth, with a few sharp lines of 
growth. 
The Upper Ludlow Rock, Ludlow, and near Ledbury. 
1. Turrttella gregaria. —The Gregarious Turritella, pi. 
XXXIII.* figs. 81, 82. 
T. Gregaria. Sowerby, Sil. Syst. p. 603, pi. 3. fig. 1. 
Subulate, with six convex smooth volutions; aperture orbicu¬ 
lar; length from four to six lines, width two to three lines. 
The Upper Ludlow Rock, Horeb Chapel. 
2. Turritella obsoleta. —The Obsolete Turritella, pi. 
XXXIII.* fig. 88. 
T. obsoleta. Sowerby, Sil. Syst. p. 603, pi. 3, figs. 7 a. 
Subulate, smooth, with nine convex volutions ; aperture 
round; length one inch and a fourth, width five lines. 
The Upper Ludlow Rock, Horeb Chapel, and Felindre. 
3. Turritella cancellata. —The Cancellated Turritella, 
pi. XXXIII.* fig. 75. 
T. cancellata. Sowerby, Sil. Syst. p. 642, pi. 20, fig. 18. 
Subulate; longitudinally striated, with spiral unequal ribs 
on each volution. 
The Lower Silurian Rocks, Mandinam, Llandovery, Hope 
Mill Shelve. 
1. Turbo Prycejl —Price’s Turbo, pi. XXXIII.* fig. 90. 
T. Pricece. Sowerby, Sil. Syst. p. 642, pi. 21, fig. 19. 
Body large, with an angular middle; spire short; umbilicus 
deep and curved. 
The Lower Silurian Rocks, Mandinam, Llandovery. 
2. Turbo corallii. —The Coral 1 urbo, pi. XXXIII.* f. 76. 
T. corallii. Sowerby, Sill. Syst, p. 612, pi. 5, fig. 27. 
3 D 
