Bulinus. 
MOLLUSCA. 
99 
apex; aperture elongated, narrow, acutely pointed above; outer 
lip much thickened and elevated in front, and distinctly defined 
behind; inner lip with a broad reflection, and three strong, 
sharp plaits, the upper one partly concealed by the callous, the 
lower one formed by the spiral edge of the columella; base 
slightly notched. Length upwards of three-eights of an inch. 
The Crag at Ramshot. 
8. Auricula simulata. —The Dissembled Auricula, pi. 
XLVI. fig. 40, 41. 
Auricula simulata. Sowerby, II. p. 144, pi. 163, fig. 5, 6. 
Bulla simulata , Brander, p. 61. 
Oblong-ovate; spire of medium length, consisting of four 
ventricose, well defined volutions; aperture elongated, narrowed 
both above and below; outer lip sharp, even on the edge, not 
much expanded, and striated internally; columellar lip slightly 
thickened, and provided with two broad, prominent, laterally 
compressed plaits, and a slight sinus dividing this from the 
outer lip; whole surface covered by spiral, close-set ribs, ser¬ 
rated on both sides, facing each other on the opposed ribs, and 
forming a series of cell-like hollows. Length three-quarters of 
an inch. 
The London Clay, Barton Cliff. 
9. Auricula discrepans. —The Discrepant Auricula, pi. 
XLVI. fig. 42, 43. 
Auricula simulata. Sowerby, II, p. 144, pi. 163, fig. 7, 8. 
Oblong-ovate; spire conical, of medium length, with five 
slightly ventricose volutions, ending in an acute apex; aperture 
oblong, contracted and pointed above, as well as below; outer 
lip plain and sharp at the edge, and internally striated; pillar 
lip broadly reflected on the columella, with three rather oblique 
plaits, the superior one shorter and more slender than the 
others; surface covered with spiral, close-set, serrated ribs, the 
points of each nearly joining with those of the opposing ribs, 
leaving cell-like openings between them. 
London Clay at Barton Clift’ and Hordwell. 
This shell may easily be mistaken for A. simulata , but differs in being 
somewhat more elongated, the spire less ventricose and more acute, in 
having an additional volution, and in the plaits of the lip being more ob¬ 
lique, with a third and smaller one above the others. 
10. Auricula inflata. — The Inflated Auricula, pi. 
XXX.* fig. 30. 
Auricula injlata. Sowerby, Geo, Trans. IV. N. series, p. 
336, pi. 11, fig. 11. Bennett, Cat. Wilt. Foss. p. 2. 
Oblong-ovate; body long; spire short, with four rather in¬ 
flated volutions, the apicial one acute; aperture subquadrangular 
below, but with one of its upper angles acutely elongated; outer 
lip much thickened, obtuse on the edge, and united with the 
inner lip, which has two strong plaits, the upper one slightly 
inclined downwards at the point, the lower one sometimes 
divided in the middle by a longitudinal groove; surface with 
numerous spiral lines of elongated punctures. 
Tliis species differs from A. incrassala, in being much longer, with the 
lip less enlarged. 
bound in the Gault, Kent and Wiltshire. 
Genus L\.—BULINUS.— Bruguiere. 
Shell oval or oblong, generally thin, and covered with 
a slender epidermis; spire obtuse, variable in length and 
number of its volutions, which for the most part are few ; 
aperture oval, wide, anteriorly rounded; outer lip simple, 
reflected, continuous, joining the columellar lip without 
an emargination, and reflected over part of the body; 
columella smooth, straight, without a truncature, or 
widening at the base. 
1. Bulinus costellatus. — The Ribbed Bulinus, pi. 
XLVI. fig. 30, 31. 
Bulinus costellatus. Sowerby, IV. p. 89, pi. 366. Fleming, 
p. 266. 
Oblong-ovate, slightly inflated; spire with four nearly flat- 
sided volutions, the apex rather obtuse; aperture elongated, 
acute above, and rounded below, occupying about half the 
length of the shell; surface covered with numerous, small, thin, 
sharp, longitudinal, slightly oblique ribs, the interstices plain. 
Fresh Water formation, Isle of Wight. 
This species differs from the following, but the aperture in this is much 
larger in proportion to the size of the shell, and, besides, it is always a 
dextral shell, while all the specimens o KB. ellipticus are sinistral. 
2. Bulinus ellipticus -The Elliptical Bulinus, pi. 
XLVI. fig. 36, 37. 
Bulinus ellipticus. Sowerby, IV. p. 46, pi. 337* Fleming, 
p. 266. 
Shell an elongated ellipsis, thickened in the centre, and gra¬ 
dually tapering to both extremities; body occupying about half 
the length of the shell; spire with five reversed, very slightly 
inflated volutions, with an obtuse apex, and the sutural line 
shallow; aperture small, narrow, its length being equal to twice 
its width, situate on the left side, contracted above, and wide 
below; columella a little oblique; outer lip plane; base equally 
blunt with the apex; whole surface covered by numerous, some¬ 
what obtuse, longitudinal, slightly oblique ribs, with furrows 
between them. Sometimes attains the size of four inches. 
Fresh Water formation at Schalcomb, Isle of Wight. 
Genus L VI.—C O CIILIC A RINA.— Brown . 
Shell subdiscoidal; spire variable, subdepressed in 
some, and more subconic in others; body provided with 
a carina on its upper edge; base imperforate, and ven¬ 
tricose; aperture subquadrangular; columella with a 
broad, thickened callus. 
1. Cociilicarina exfansa, —The Expanded Cochlicarina, 
pi. XLVII. fig. 1, 2. 
Helicina expansa. Sowerby, III. p. 129, pi. 273, fig. 1, 2, 
3. Fleming, p. 258. 
Suborbicular, nearly smooth; body flattened above, with an 
acute carina on its superior edge, which is continuous at the 
base of the volutions to the apicial one; spire conical, depressed, 
consisting of four flattened, abruptly diminishing volutions, end¬ 
ing in an acute apex, and obscurely striated; body very ventri¬ 
cose below, with an expanded callus at the columella, spreading 
over a considerable portion of the base. 
Blue Lias at Lyme Regis. 
2. Cochlicarina solarioides. —The Sun-like Cochlica¬ 
rina, pi. XLVII. fig. 3, 4. 
Helicina solarioides. Sowerby, III. p. 129» Fleming, p. 
258. 
