MOLLUSCA. 
57 
Involute.] 
“ This very elegant species in shape very much resembles a 
small Bulla lignaria ; but is of a more conic oval shape, with 
the volutions more loosely connected ; the crown is umbilicated, 
and, together with the pillar, pure white. On the body are 
regular, rather broad, alternate, transverse bands of white and 
pale rufous brown ; and round each of the white belts is a regu- 
lar line of very minute, raised granular dots. 
“ Found near the Land’s End.” In the cabinet of Mr. 
Clark. 
4. Bulla Hydatis, pi. XIX, f. 29, 30. — First Ed., pi. 38, 
f. 29, 30. 
Bulla Hydatis, Linne, Syst. Nat., p. 1183, No. 377; Dono- 
van, pi. 88; Montagu, p. 217; Lamarck, VI, pt. 2nd, p. 35; 
Fleming, Brit. An., p. 292. 
Shell somewhat opaque, tumid, no apparent spire, but in its 
stead an umbilicated hollow, slightly oval, thin, fragile, subpel- 
lucid, of a yellowish, or greenish horn-colour, with a thin, 
transparent, ferruginous epidermis; superior portion of the 
aperture oblong, rising above the body, and rounded, a little 
contracted at the top, and widening below, where it terminates 
in a rounded base ; outer lip thin, slightly inflected ; inner lip 
white, a little reflected on the columella; whole surface with 
fine transverse stria 2 , and remote longitudinal lines of growth. 
Length an inch ; breadth three-quarters. 
Found at Weymouth and Poole, Dorsetshire; Salcomb Bay, 
Devonshire; and is not uncommon on the Western coast. 
5. Bulla producta, pi. XIX, f. 15, 16. — First Ed., pi. 
38, f. 15, 16. 
Shell subcylindrical, very pellucid, white, smooth, and glossy; 
spire concealed, subumbilicate ; aperture narrow, terminating 
in a rather acute base; outer lip very thin, rising considerably 
above the body, and somewhat pointed; a few obsolete wrinkles 
above. Length not a tenth of an inch ; breadth hardly a third 
of its length. 
Found at Dunbar, by my late friend General Bingham, and 
is in his cabinet. 
6. Bulla striata, pi. XIX, f. 41, 42. — First Ed., pi. 38, 
f. 41, 42. 
Shell oblong-oval, inflated, white, and opaque ; spire con- 
cealed, and subumbilicate ; aperture a little contracted above, 
widening below, and terminating in a rounded base ; outer lip 
smooth, thin at the edge, elevated a little above the body ; 
inner lip thickened, and slightly folded back towards the base, 
producing a small subumbilicus behind, and somewhat dupli- 
cated ; whole surface covered with minute, undulating, trans- 
verse striae, the intermediate ones finer than the others, with a 
few, nearly obsolete, longitudinal lines of growth. Length not 
quite three-eighths of an inch ; breadth two-eighths. 
Found at Greenock, by my friend Stewart Ker, Esq., to 
whose zeal we are indebted for the discovery of several rare 
and interesting species. 
7. Bulla denticulAta, pi. XIX, f. 25, 26. — First Ed., 
pi. 38, f. 25, 26. 
Bulla denticulata, Adams, Linn. Tr., V, p. 1, pi. 1, f. 3, 4, 
5; Montagu, p. 217 ; Fleming, Brit. An., p. 294; Maton and 
Rackett, p. 122. 
Shell oblong, smooth, glossy, pellucid, white ; aperture con- 
tracted above, and considerably expanded beneath ; outer lip 
terminating in a sharp, tooth-like process, and extending some- 
what above the body. 
Found in sand at The Wash, coast of Pembroke, by Mr. 
Adams. It seems a rare species. 
8. Bulla emarginata, pi. XIX, f. 21, 22 First Ed., pi. 
38, f. 21, 22. 
Bulla emarginata, Adams, Linn. Tr., V, p. 2, pi. 1, f. 9, 10, 
11 ; Montagu, p. 216; Maton and Rackett, p. 122; Fleming, 
p. 294. 
Shell pellucid, smooth ; body elongate, subcylindrical, nar- 
rower below ; aperture very wide ; outer lip much expanded ; 
inner lip slightly inflected. 
Found on the coast, near Pembroke, by Mr. Adams. 
9. Bulla Cranchii. 
Bulla Cranchii, Leach ; Fleming, Brit. An., p. 292. 
Shell subcylindrical, apex concave, strongly striated, spirally, 
in bands ; aperture narrow ; outer lip thin, nearly even ; pillar 
lip straight, a little reflected, and forming a slight cavity, and is 
somewhat waved where it joins the outer lip. Length six- 
tenths of an inch ; diameter four-tenths. 
Found in Plymouth Sound, by Mr. Prideaux. 
The aperture being so narrow, renders the continuation of 
the pillar invisible. 
Sub-Genus 2 — Bullma . — Lamarck. 
Shell very thin, destitute of epidermis, and concealed in the 
mantle of the animal; somewhat involute on one side, and 
without a columella or spire ; aperture large and wide. 
1. Bullma aperta, pi. II, f. 5 and 7 First Ed., pi. 44, 
f. 5 and 7. 
Bullaea aperta, Linne, p. 1183, No. 376; Lamarck, VI, pt. 
2nd, p. 30; Forbes, p. 6; Bulla aperta, Montagu, p. 208; 
Maton and Rackett, p. 121 ; Donovan, pi. 120, f. 1, 1 ; Da 
Costa, p. 30, pi. 2, f. 3 ; Fleming, p. 294 ; Brown, Wernerian 
Mem., II, p. 516. 
Shell compressed, suborbicular, milk-white, very thin, pellu- 
cid, and brittle ; body slightly involute in front, very small, 
destitute of a spire, and not umbilicate above ; aperture ex- 
tremely large and expanded, occupying, nearly the whole shell ; 
outer lip semicircular, very thin at the edge, and elevated con- 
siderably above the body; columellar lip very short and narrow; 
external surface glossy, with faint longitudinal lines of growth. 
Length one inch ; breadth three-fourths; but it is only in par-- 
ticular localities where it attains this size. 
Not uncommon on many of the coasts of Great Britain and 
Ireland ; we may particularise Dorsetshire, South Devon, Corn- 
wall, Northumberland, Tenby, Frith of Forth, and Dublin Bay. 
2. BuLLasA Catina, pi. XIX, f. 33, 34 — First Ed., pi. 44, 
f. 33, 34. 
Bulla Catina, Montagu, p. 215, pi. 7, f . 7 ; Maton and 
Rackett, p. 122; Brown, Ency. Brit., VI, p. 434; Turton, Brit. 
Fau., p. 168; Fleming, p. 294. 
Shell oblong-ovate, pellucid, white, and glossy ; body small, 
incurved; apex obtuse, with a visible involution above; aperture 
extremely large, occupying almost the entire shell, ending in a 
well rounded base ; outer lip thin at the edge, but not extend- 
ing above the body; no reflection of the inner lip on the pillar; 
whole surface covered with numerous, transverse, chain-like 
p 
