MOLLUSCA. 
56 
RosteUaria Buccinoides. Sowerby, Geo. Trans. IV. 2nd 
series, p. 336, pi. 11, fig. 17. 
Shell subulate; body short; spire long, consisting of eight 
rounded volutions, each furnished with a single varix, and ter¬ 
minating in an acute apex; whole shell covered with numerous, 
slightly bent, longitudinal ribs ; outer lip destitute of a lobe. 
Found in the Gualt. 
FAMILY V—CANALIFERA. 
Shell with a canal of greater or less length, situated 
at the base of the aperture; the outer lip differing but 
little in the young and adult state. 
Sub-division I. Having a permanent varix on the 
outer lip; and varices on the spire. 
Genus XVIII.— TRITON.— Lam arch . 
Shell oblong; spire rather prominent, and acute at the 
apex; volutions with never more than two on each; 
aperture nearly round; outer lip thickened; inner or 
pillar lip generally rugose; beak somewhat elongated, 
and turned backwards; operculum of a horny texture. 
1. T. c analiculatum—T he Canaled Triton, pi. XXXIV. 
fig. 7, 8. 
Buccinum ca7ialiculatu?n. Sowerby, Min. Conch. V. p. 14, 
pi. 415, fig. 2, 2. Buccinum desertum , Brander, fig. 18, 19. 
JSassa canaliculate Fleming, Brit. An. p. 341. 
Shell elongated; spire consisting of six volutions with some¬ 
what flattened sides, and separated by a depressed canaliculate 
suture, which is provided with a prominent margin; upper 
volutions with strong longitudinal ribs, which are less marked 
in two or three of the lower volutions, but these are provided 
at irregular intervals with a few varices; whole shell trans¬ 
versely striated; inner lip smooth and flattened; outer lip 
thickened, with crenulations internally, but plain at the margin; 
aperture ovate, with a slight canal at its upper extremity; beak 
short and curved. 
Found plentifully in the London Clay at Barton Cliff and 
Muddiford. 
Genus XIX.—MU REX.— Linnceus, 
Shell subturreted, more or less elongated; spire for 
the most part prominent, terminating in an acute apex, 
furnished with three or more rows of digitated, muri- 
cated, or spinous varices, or with an irregularly foliaceous 
or lacerated fringe; aperture suborbicular; columella 
smooth; beak generally much elongated, sometimes very 
long, and frequently recurved, provided with a horny 
operculum. 
1. M. coronatus—T he Crowned Murex, pi. XXXIV. 
fig. 33, 34. 
Triton. 
Murex coronatus . Sowerby, Min. Conch. III. p. 52, pi. 
230, fig. 3. 
Oblong-ovate, turreted; spire consisting of four or five volu¬ 
tions, which are slightly concave above, and terminating in a 
somewhat obtuse apex; body and spire covered with ten longi¬ 
tudinal acute ribs, each of which terminate in a sharp point 
above; between the ribs the shell is widely striated; aperture 
oblong-ovate, wide, and flattened above, and narrowed beneath; 
inner lip broadly reflected on the columella; outer lip thick, 
and crenulated internally; beak slightly curved. 
Found in the London Clay at Highgate Hill. 
2. M. min ax. —The Threatning Murex, pi. XXXIV. fig. 
9, 10. 
Murex minax. Brander, fig. 62. Sowerby, Min. Conch. 
III. p. 51, pi. 229, fig. 2. 
Short; body large in proportion to the spire; spire consisting 
of four narrow volutions, tuberculated above, and terminating 
in a sharp apex; body somewhat inflated, and provided with a 
double zone of tubercles, those on the upper portion are spine¬ 
shaped, and furrowed on their outer margins; whole shell 
covered with somewhat undulous and close, irregular stria); base 
of the body sulcated; aperture nearly orbicular; inner lip 
smooth, and broadly reflected on the columella; outer lip thin; 
beak short, and slightly curved. 
Found in the London Clay at Highgate Hill. 
3. M. torosus. —The Knobby Murex, pi. XXXIV. fig. 20* 
Murex tuberosus . Sowerby, Min. Conch, pi. 229, fig. 1. 
Oblong-ovate, subterreted; spire consisting of five or six 
volutions, ending in a pointed apex; body and spire provided 
with numerous, large, blunted, nearly obsolete ribs, which ter¬ 
minate in large obtuse knobs on the most prominent part of the 
volutions; base convex; the whole shell covered with many 
rough lines of growth, which are crossed by thick-set, strong 
spiral stria); aperture ovate; outer lip blunt; beak short, and 
slightly curved. 
Found in the London Clay at Highgate Hill. 
4. M.crjstatus —The Crested Murex, pi. XXXIV.fig. 1,2. 
Murex cristatus. Sowerby, Min. Conch. III. p. 52, pi. 230, 
fig. 1, 2. 
Ovate; body large; spire short, consisting of five abruptly 
tapering volutions, terminating in a slightly pointed apex; six 
or seven longitudinal, sharp, prominent ribs cover the body of 
the shell, and extend to the volutions of the spire, these are ail 
spiniform and canaliculatcd above, and each provided with three 
plaits, formed by ribs behind; whole shell covered with fine, 
spiral stria); aperture ovate, widest above; beak curved, and of 
medium length; canal rather wide; inner lip broadly reflected 
on the columella above, and narrowing as it descends, with a 
subumbilicus below; outer lip considerably produced above, in 
the form of a canaliculate elongation, and with two other pro¬ 
duced undulations below; back of the beak exhibiting two 
tubular, projecting processes, being the former bases of the 
beak, produced by the growth of the shell. 
Discovered in the London Clay at Highgate Hill, by G. B. 
Snow, Esq. 
5. M. argutus. —The Sugar-loaf Murex, pi. XXXIV. fig. 
35, 36. 
Murex argutus. Brander, 13. Sowerby, Min. Conch. IV. 
p. 59, pi. 344. 
