48 
MOLLUSCA. 
Mitra* 
* Shells smooth and unarmed. 
9. V. Lamberti. —Lambert’s Volute, pi. XXX. fig. 22, 23. 
Voluta Lamberti . Sowerby, Min. Conch. II. p. 65, 
pi. 1*29* Voluta of Harwich. Parkinson, Org. Rem. III. 
p. 26, pi* 5, fig. 13. A Cast. Hist. Lap. Fig. p. 112, pL 33, 
fig. 3. Appendix to Dale’s Hist, of Harwich, p. 289, pi. 10, 
fig. 14. Mitra Lamberti. Fleming, Brit. An. p. 333. 
Shell fusiform, elongated, smooth, tapering to both extre¬ 
mities ; spire short, consisting of five gradually tapering 
volutions, which terminate in a blunted papillose apex ; aper¬ 
ture about two-thirds the length of the shell, elongated, 
straitened and acute above, widening gradually to the 
centre, and contracting beneath, terminating in an oblique, 
subtruncated base; columella provided with three or four 
plaits; outer lip sharp in the edge, and with a slight sinus 
where it unites with the body above. 
Found in the Crag Marl at Holywell, Bawdsey Cliff, and 
Aldborough, Suffolk. 
SECTION II.—SHELLS MEDIUM SIZED, WITH SMOOTH PAPILLA. 
* Musicalis. 
10. V. nodosa. — The Nodulous Volute, pi. XXXI. 
fig. 1 and 5. 
Voluta nodosa. Sowcrby, Min. Conch. IV. p. 135, pi. 399> 
fig. 2. Fleming, Brit. An. p. 333. 
Shell ovate ; spire conical, produced, nearly equal in length 
to the body, consisting of five tumid volutions, tapering to 
an acute apex, the lower one broad and hollow ; volutions 
well defined, and crowned with two rows of nodulous spines; 
body with irregular, obtuse, longitudinal ribs; the whole 
shell crossed by numerous and deep sulci; aperture oblong, 
wide in the centre, and narrowed to each extremity ; columella 
with three plaits ; outer lip striated within. 
Found in the London Clay at Barton Cliff. 
11. V. ambigua. — The Ambiguous Volute, pi. XXXI. 
fig. 8 and 11. 
Voluta ambigua. Sowerby, Min. Conch. IV. p. 135, 
pi. 399> fig* L Fleming, Brit. An. p. 332. Strombus 
ambiguus. Brander, Hant. fig. 69. 
Shell ovate-oblong; spire short, rough to the touch, con¬ 
sisting of five volutions, which are hollowed above, and ending 
in a pointed apex ; the whole shell covered with irregular, 
longitudinal ribs, which are angular above, crossed by nume¬ 
rous, transverse, undulous furrows ; aperture elongated, 
nearly the entire length of the body, wide in the centre, and 
narrowed towards each extremity ; columella with three 
plaits; outer lip rising from the body above, plaited within, 
and granulated on the edge. 
Found in the London Clay at Barton Cliff. 
SECTION III.—MITRE-SHAPED, PAPILLA ACUTE. 
12. V. Magorum. — The Magicians’ Volute, pi. XXXI. 
fig. 16, 17- 
Voluta Magorum. Brocchi, Conch. Foss. Sub. II. p. 307, 
pi. 4, fig. 2. ? Sowerby, Min. Conch. III. p. 164, pi. 290, 
fig. 3. Fleming, Brit. An. p. 332. 
Ovate, fusiform ; spire conical, two-thirds the length of the 
body, consisting of five volutions, terminating in a somewhat 
obtuse apex, with about twelve narrow ribs; the whole shell 
covered with fine, obscure, transverse striae, which become 
more conspicuous towards the base; aperture oblong ovate, 
rounded above ; columella provided with numerous plaits, 
which extend to the top of the pillar lip, the lower ones large, 
with an obtuse termination, while the upper ones are small, 
and irregularly interrupted ; outer lip smooth ; beak short, 
slightly curved. 
Found in the London Clay at Barton Cliff. 
13. V. costata. — The Ribbed Volute, pi. XXXI. 
fig. 21, 22. 
Voluta costata. Brander, Hant. fig. 45. Sowerby, Min. 
Conch. III. p. 163, pi. 290, fig. 1, 2, and 4. Fleming, Brit. 
An. p. 332. 
Shell ovate, fusiform; spire conical, consisting of six or 
seven volutions, which terminate in an acute apex ; with about 
nine longitudinal, broad, obtuse ribs, which are most promi¬ 
nent at their upper ends ; crossed by numerous, wide, indis¬ 
tinct strife, which are nearly obsolete about the middle of the 
body ; columella with three plaits, the lower one larger than 
the others; pillar lip strongly reflected on the body ; outer 
lip smooth, slightly thickened by a rib; aperture oblong- 
ovate, rounded above. 
Found in the London Clay at Barton Cliff. 
Genus IX.—MITRA.— Lamarck. 
Shell turreted or subfusiform, with an acute spire, 
which, for the most part, is longer than the aperture, 
which is elongated, longitudinal, and notched at the 
base, and terminating in a very short canal; columella 
plaited, the plaits are sharp at the edge, generally 
parallel and transverse, with the lower ones smaller than 
the others; outer lip usually somewhat acute at the 
edge, but in some instances a little thickened, crenu- 
lated, and even provided with a blunt tooth at the upper 
part within ; external surface in the recent state gene¬ 
rally covered by a thin, horny epidermis. 
1. M. scabra. — The Rough Mitre, pi. XXXI. fig. 20 
and 25. 
Mitra Scabra. Sowerby, Min. Conch. IV. p. 142. 
Fleming, Brit. An. p. 334. Jduccinum scabriculum. Brander, 
Hant. fig. 20. 
Ovate, fusiform; spire nearly equal to the body in length, and 
consisting of five or six volutions, the two upper ones smooth ; 
the whole surface crossed by numerous, close, sharp, elevated, 
transverse, rough stria 3 , and intersected by many longitudinal, 
irregularly elevated, undulating lines of growth; aperture 
fusiform ; columella with four nearly uniform plaits, with two 
more slender, and nearly obsolete one's above them, which, 
however, arc frequently wanting ; outer lip irregularly 
thickened, with a blunt tooth-like process on the margin 
near its centre. 
Found plentifully in the London Clay at Barton Cliff. 
