Terebellum. 
MOLLUSCA. 
45 
Genus III. — ANCILLARIA. — Lamarck . 
Shell oblong, subcylindrical ; spire short, seldom 
more than a third of the length of the shell, the suture 
being generally obscured by an enamel, which fre¬ 
quently covers the whole spire, which is not canaliculate 
at the sutures ; aperture narrow, effuse above, and 
notched at the base; lower portion of the columella 
smooth, with an oblique, tumid, usually striated varix 
at the base; whole outer surface smooth and glossy; 
supposed to be devoid of both epidermis and oper¬ 
culum. 
1. A. avemiformis. — The Oat-shaped Ancillaria, pi. 
XXX. fig. 12. 
Ancillaria aveniformis . Fleming, Brit. An. p. 336. 
Ancilla aveniformis. Sowerby, Min. Conch. I. p. 225, pi. 
99, middle right figure. 
Oblong-ovate, elongated, smooth, shining; spire long; 
consisting of four or five volutions, and terminating in a 
sharp apex ; base two plaited ; inner lip with a short exten¬ 
sion ; aperture somewhat more than half the length of the 
shell, slightly contracted, and angular above, and expanded 
below ; enamel of the pillar lip extended over a third of the 
volutions in front. 
Found in the London Clay at Barton. 
2. A. Anglica. — The English Ancillaria, pi. XXX. 
fig. 15. 
Ancillaria. Anglica . Pilkinton, Linn. Trans. VII. p. 116, 
pi. 11, fig. 1. A. aveniformis , Sowerby, Min. Conch. J. 
p. 225, pi. 99, middle left figure. 
Oblong-ovate, smooth, shining; spire with four or five 
volutions, terminating in an acute apex ; aperture somewhat 
more than half the length of the shell, contracted above, 
widening in the centre, and expanding at the base; varix 
with two plaits; outer lip slightly inflected, and extending 
considerably below the base of the pillar lip. 
Found at Barton, in the London Clay. 
3. A. turritella. —The Turreted Ancillaria, pi. XXX. 
fig. 13, 14. 
Ancillaria turritella . Fleming, Brit. An. p. 376. Ancilla 
turritella . Sowerby, Min. Conch. 1. p. 226, pi. 99, larger 
figures. 
Subcylindrical; spire short, consisting of five subturreted 
volutions, terminating in an acute apex, arid covered with 
minute, transverse striae, which arc only visible by the aid of 
a lens; upper portion of the volutions glossy, the middle 
parts with minute decussated striae ; varix furnished with a 
nearly obsolete spiral sulcus, a little above the varix; colu¬ 
mella three plaited, and with a deep sulcus ; aperture exceeding 
half the length of the shell, acutely contracted above ; outer 
lip greatly expanded below, and extending somewhat lower 
than the base of the columella. 
Found at Barton Cliff. 
4. A. .subulata. — The Awl-shaped Ancillaria, pi. XXX. 
fig. 20, 21. 
Ancillaria subulata . Fleming, Brit. An. p. 336. Anacilla 
subulata. Lamarck, Foss. Env. de Paris, p. 24. Sowerby* 
Min. Conch. IV. p. 37, pi. 333. 
Shell subulate, elongated, smooth, glossy ; spire lengthened, 
and abruptly acute, consisting of five volutions ; varix at the 
base of the columella, finely striated; aperture not quite 
half the length of the shell, contracted above and expanded 
beneath. 
Found in the Upper Marine Formation, Isle of Wight; 
also near Christchurch, and Hampshire. 
Genus IV.—T E R E B E L L U M.— Lamarck . 
Shell convolute, subcylindrical, rolled round its lon¬ 
gitudinal axis in the form of an elongated cone, and 
nearly pointed at the summit; aperture contracted above 
and expanded below; base notched; columella smooth; 
truncated at the base ; outer lip entire and not thickened. 
1. T. fusiforme. — The Spindle-formed Terrebellum, 
pi. XXX. fig. 26, 27. 
Terrebellum Jusifurme. Lamarck, Env. de Paris, p. 22. 
Sowerby, Min. Conch. III. p. 157, pi. 287. Fleming, Brit. An. 
p. 330. 
Sub fusiform, subcylindrical, tapering somewhat abruptly 
towards the apex, and gradually towards the base; spire 
short, consisting of two volutions and terminating in an obtuse 
apex ; aperture about three-fifths the length of the shell, with 
an adpressed straight canal, emanating from its upper angle, 
and terminating in the apex of the spire ; pillar lip reflected 
on the columella, which descends considerably lower than the 
outer lip, which is somewhat inflected and rounded at its base. 
Found in the London Clay, at Hordweil. 
2. T. convolutum. — The Convoluted Terrebellum, 
pi. XXX. fig. 24, 25. 
Terebellum convolutum. Lamarck, Env. clc Paris, p. 21. 
Seraphs convolutus. Montfort, Conch. Syst. II. p. 375. 
Sowerby, Min. Conch. III. p. 155, pi. 286. Fleming, 
Brit. An. p. 330. Hull a sopita. Ib. Bulla volutata. 
Brander, Foss. Ilant. Collect, fig. 29. a. 
Shell smooth, extremely fragile, subcylindrical, elongated, 
tapering gradually to both extremities, superior end termi¬ 
nating in an obtuse, hollow, pointed apex; base obliquely 
truncated ; spire internal, concealed ; aperture longitudinal, 
extending to the tip of the spire; columella smooth ; outer 
lip sharp, and slightly inflected ; diameter about a third of its 
length. 
Found in the Clay upon the Coast of Hampshire. 
Genus V .— CY PR AE A .— Linnaeus . 
Shell ovate, or oblong-ovate, convex; margins invo¬ 
lute ; aperture longitudinal, narrow, extending the whole 
length of the shell, dentate on both sides, and effuse at 
the extremities; spire very small, generally hidden in 
the adult, or perfect shells. 
1. C. oviformis. — The Egg-shaped Cypraea, pi. XXX. 
fig. 34, 35. 
M 
