SCALARIA. 
MOLLUSCA. 
83 
Shell turreted; with seven or eight well defined, disunited 
volutions, covered with somewhat distant, slender edged, broad 
based, slightly curved and oblique, longitudinal, reflected ribs, 
a little bent back in the centre; aperture nearly round, and 
destitute of a cord round the base, and also of a subumbilicus. 
This species is closely allied to the S. clathrus , but a little attention 
to the above specific character will shew the difference. 
Found in the Suffolk Crag at Woodhall. 
3. S. reticulata. —The Reticulated Scalaria, pi. XLII. 
fig. 3, 4. 
Scalaria reticulata . Sowerby, Min. Couch. VI. p. 150, pi. 
577, %. 5. Turbo reticulatus , Brander, fig. 27. 
Shell subulate, short; with eight well defined, inflated, acute 
volutions, covered with numerous, close, longitudinal ribs, and 
crossed by nine or ten prominent spiral strife, producing a reti¬ 
culated aspect; columella hollow ; base smooth. 
Found in the London Clay at Barton Cliff. 
4. S. similis. —The Similar Scalaria, pi. XLII. fig. 5, G. 
Scalaria similis, Sowerby, Min. Conch. I. p. 49, pi. 1G, two 
upper figs. Fleming, Brit. An. p. 311. 
Shell with eight or nine well defined volutions; provided 
with remote, rounded, circular, ami prominent longitudinal 
ribs; a series of five or six spiral, slightly elevated ribs traverse 
the shell from the base to the apex, but are interrupted by 
each of the ribs; the lower one on each volution the most 
prominent; aperture slightly ovate; lips broad ; and nearly of 
uniform thickness all round. 
This is a Crag fossil, and is found at Bramcrton, near Nor¬ 
wich, and at Holy wells, near Ipswich. 
5. S. iNTEURUPTA —The Interrupted Scalaria, pi. XLII. 
fig. 7, 8. 
Scalaria interrupta. Sowerby, Min. Conch. VI. p. 149, pi. 
577, fig. 3. 
Shell subulate; volutions united and convex; with numerous 
longitudinal, obtuse ribs, slightly elevated at both extremities, 
and united at both ends by transverse ridges, and a large varix 
upon each volution; the whole shell spirally striate between 
the ribs; aperture circular, and its base projecting beyond the 
lower portion of the body. 
A striking character of this shell is the union of all the ribs by a 
thread-like, spiral rib. 
Found in the London Clay at Barton Cliff. 
G. S. subulata. —The Subulate Scalaria, pi. XLII. fig. 9, 
10 . 
Scalaria subulata, Sowerby, Min. Conch. IV. p. 125, pi. 
390, fig. 1. Fleming, Brit. An. p. 312. 
Shell subulate, turreted; with eight slightly defined, con¬ 
tiguous volutions; covered by ten or twelve thick, well raised, 
longitudinal ribs, which are reflected, and broadest at their 
upper ends; aperture nearly circular; destitute of a cord around 
the base, and without an umbilicus. 
Found in the Suffolk Cra^. 
o 
7. S. acuta. —The Acute Scalaria, pi. XLII. fig. 11, 12. 
Scalaria acuta, Sowerby, Min. Conch. I. p. 50, pi. 1G, two 
lower figs. Fleming, Brit. An. p. 312. 
Shell turreted; with eight or nine very gradually tapering, 
deeply defined, and somewhat distant volutions; with numer¬ 
ous, longitudinal, expanded, recurved ribs, acutely angular on 
their upper ends, uniting the volutions to each other, and form¬ 
ing a flattened space above; three spiral, depressed ribs extend 
from the base to the apex, between the longitudinal ribs, and a 
fourth more prominent one near the lower margin of each volu¬ 
tion; aperture circular, with its margin reflected, and contracted 
into a spine-formed process at its upper and outer extremity, 
and slightly peaked below the columellar side. 
Found in the London Clay at Barton Cliff. 
8. S. undosa —The Waved Scalaria, pi. XLII. fig. 13. 
Scalaria undosa. Sowerby, Min. Conch. VI. p. 150, pi. 
577, fig. 4. 
Shell subulate; volutions united, convex; with about twenty- 
four slightly elevated, waved, broad, longitudinal ribs, and fine 
numerous, spiral stria* crossing them, and terminating in a 
transverse band; base almost smooth, with nearly obsolete lines 
emanating from the ribs. 
Found in the London Clay at Barton Cliff. 
9* S. Ml NUT a. —The Minute Scalaria, pi. XLII. fig. 14, 15. 
Scalaria minuta. Sowerby, Min. Conch. IV. p. 125, pi. 
390, fig. 3, 4. Fleming, Brit. An. p. 312. 
Shell turreted; with seven or eight contiguous, smooth volu¬ 
tions; each furnished with about twenty obtuse, thin, slightly 
elevated, nearly straight, longitudinal ribs; aperture slightly 
ovate, furnished with a narrow lip all round, and is destitute of 
an umbilicus. 
This shell is only about half an inch in length. Fig. 14 is a magnified 
figure. It strongly resembles the recent species, S. Clatliratulus , but the 
ribs in that shell aro more numerous and sharp. 
Found in the Crag at Ramshot. 
10. S. semicostata. —The Semi-ribbed Scalaria, pi. XLII. 
fig. 1G, 17. 
Scalaria semicostata. Sowerby, Min. Conch. I. p. 50, pi. 
1G, middle fig. Fleming, Brit. An. p. 312. 
Shell with about seven contiguous, inflated volutions; with 
numerous, slightly elevated, longitudinal ribs, extending only 
about half way down each volution, the lower portion being 
quite smooth, all the upper portion spirally striated; aperture 
circular. Length about half an inch. 
Found in the London Clay at Barton Cliff. 
11. S. mutica. —The Barbless Scalaria, pi. XLII. fig. 19. 
Scalaria acuta , var. mutica. Sowerby, Min. Conch. VI. p. 
149, ph 577, fig. 2. 
Shell subturreted; with seven inflated volutions, and about 
sixteen longitudinal, thick, sharp edged, reflected, unequal ribs 
on each volution, but not produced above; about four fiat and 
narrow' spiral ribs intervene betwixt the longitudinal ones, but 
do not cross them ; aperture circular; margin thin. 
Found in the London Clay in Alum Bay, Isle of Wight. 
12. S. plicata. —The Plaited Scalaria, pi. XLII. fig. 18. 
Scalaria plicata. Deshayes, Foss. Env. dcs Paris, pi. , 
fig. . Scalaria semicostata , Sowerby, Min. Conch. VI. p. 
150, pi. 577, fig. 6. 
Shell greatly elongated; with eleven or twelve attached, 
moderately inflated volutions, ending in an acute apex; with 
numerous, nearly straight, longitudinal, blunted ribs, the inter¬ 
stices crossed by fine spiral stria*; base of the body smooth; 
aperture slightly ovate; lips smooth and rounded, in their 
whole circumference. 
Found in the London Clay at Barton Cliff. 
