20 MOLLUSCA. 
2. D. depressa, pl. VIII, f. 35, 36. First Ed., pl. 51, f. 35, 36. 
Helix depressa; Montagu. p. 439, pl. 15, £5; Turbo depressus; Tur- 
ton, Brit. Faun., p. 185; Skenea depressa; Fleming, Brit. An., 313. 
Shell sunbdepressed, subpellucid, with three or four volutions ; spire 
well defined by the suture, but scarcely elevated above the body, and 
slightly wrinkled-across; apex distinct, but not produced; body cylindri- 
cal, base rounded, with a large umbilicus, in which. the superior volutions 
are seen; aperture obicular, the lips continuous, even all round, and not 
clasping the body, but spreading slightly upon it; colour of a light brown. 
Diameter hardly a line. 
Found at Whitsand Bay and Falmouth, Cornwall; Burrow Island, 
Devonshire; and at Dunbar, Frith of Forth. 
3. D. serpuloatea, pl. VIU, f. 40, 41; First Ed., pl. 51, f. 40, 41. 
Helix serpuloides; Montagu, Sup., p. 147, pl. 21, f. 3; Skenea serpu- 
loides; Fleming, Brit. An., p. 813. 
Shell compressed, glossy, white, with three smooth volutions; spire 
but little elevated above the body, and terminating in a small but not 
pointed apex; aperture orbicular, slightly adhering to the body, and 
turning considerably downwards, forming a large and deep umbilicus, in 
which the superior volutions are distinctly visible. Diameter not a line. 
Found on the Devonshire coast, extremely rare. 
This bears some resemblance to the D. depressa, but differs in the 
slight connection of the volutions, and their more cylindrical form beneath ; 
it differs also in colour. 
Subdivision I1.—Volutions Sinistral. 
4, D. resupinata, pl. VILL, f. 45 and 47; First Ed, pl. 51, f. 45 and 47. 
Helix resupinata; Montagu, p. 444; Walker, Minute Shells, f 24. 
Shell with three reversed volutions, aud terminating in an obtuse apex ; 
aperture large, oval, and not spreading on the body. 
Genus 22.—Spira.—Brown. 
Shell smooth, nearly globular, or semiovate; spire small in pro- 
portion to the size,of the body, and depressed ; aperture enveloping 
the body. 
1. C. globosa, pl. VII, f. 34 and 37; First Ed., pl. 51, f. 34 and 37; 
Delphinoidea globosa. 
Helix globosa; Montagu, p. 444; Maton and Racket, Linn. Trans., 
VIII, p. 203; Walker, Minute Shells, f. 25; Turton, Brit. Faun., p. 190. 
Shell smooth, white, opaque, glossy, and round, with two volutions, 
the superior one slightly elevated above the body; aperture suborbicular, 
and clasping the body; outer lip thin, entire. Diameter not a line. 
Found on the coast of Sandwich. 
2. C. nitidissima, pl. VIL, f. 42 and 44.—First Ed., pl. 51, f. 42 and 
44; Delphinoidea nitidissima. 
Helex nitidissima; Montagu, p. 447; Maton and Racket, Linn. Trans., 
VIII, p. 205; Adam’s Linn. Tr., V, p. 6, pl. 1, f. 22, 23, 24. 
Shell nearly globular. extremely glossy and’ horn coloured; pellucid, 
with two volutions, finely striate transversely ; base rounded with a small, 
round umbilicus; aperture semilunar, enveloping the body; outer lip 
plain. Diameter not a line. i 
Found on the coast of Pembrokeshire. 
3. C. coarctata, pl. VILL, f. 48 and 52.—First Ed., pl. 51, f. 43 and 
52; Delphinoidea coarctata. 
Helix coarctata; Montagu, p. 447; Maton and Racket, Linn. Trans., 
VIII, p. 205; Walker, Minute Shells, f. 30. 
Shell nearly globose, white, and pellucid; with two volutions; body 
very large, superior volution extremely small; aperture subrotund, em- 
bracing the body contracted at the base of the columella; outer lip thin 
and plain; an extremely small umbilicus. Diameter not a line. 
Found at Sandwich, very rare. 
4. C. reticulata, pl. VILL, f. 38, 39.—First Ed., pl. 51, f. 38, 39; 
Delphinoidea reticulata. 
Helix reticulata; Montagu, p. 444; Maton and Racket, Linn. Trans., 
VIII, p. 203; Adams, Micr., pl. 14, f. 12; Walker, Min. Sh., f. 26. 
Shell semiovate, subglobular, white, and pellucid, with two volutions, 
spirally and transversely striate; aperture nearly orbicular, clasping the 
body; margin of the outer lip plain, and divested of striae; base with a 
subumbilicus. Diameter not quite a line. 
Found at Reculver; extremely rare. 
5. C. bicolor, pl. VIII, f. 50, 51.—First Ed., pl. 51, f. 50, 51; Del- 
vhinoidea bicolor. 
[ TRAcHELIPoDa. 
Helix bicolor; Montagu, p. 447; Maton and Racket, Linn. Trans., 
VIII, p. 205; Adams, Linn. Trans., V, p. 4. 
Shell with two smooth, pellucid, but not glossy volutions, of'a yellow- 
ish horn colour; base provided -with a very small umbilicus. 
This species differs*from the C. nétidissima, in being perfectly smooth, 
not glossy, and in the inside of the shell being white. 
6. C. tubulata, pl. VIII, f. 46.—First Ed., pl. 51, f. 46; Delphinoidea 
tubulata. 
Helis tubulata; Montagu, p. 446; Maton and Racket, Linn. Trans., 
VIII, p. 204; Adams, Linn. Trans., III, p. 67. 
Shell globular, with three longitudinally striate volutions, and a marginal 
tube at the base in place of an umbilicus, extending beyond the base of 
the shell. 
7. C. variegata? ‘ 
Helix variegata; Montagu, p. 446; Adams, Linn. Trans., III, p. 67. 
Shell consisting of four subpellucid, smooth volutions, with red linea- 
tions; the body ventricose, and imperforate at the base; margin of the 
aperture very much spread. 
GENus 23.—PLANARIA.—Brown. 
Shell discoidal ; spire depressed ; the volutions apparent on both 
sides, and encompassed by the body, or outer one ; aperture trans- 
verse and semilunar, and not clasping the body. 
1. P. pellucida, pl. VII, f. 53-54-55.—First Ed., pl. 51, f. 53-54-55. 
Shell depressed, very thin, pellucid, white, and extremely glossy, con- 
sisting of four rounded volutions, slightly wrinkled across, visible on both 
sides of the disk; the one next the body above nearly parallel with it, the 
inner ones descending into a deep umbilicus; the centre volutions encom- 
passed by the body; aperture semilunar, transverse, and oblique; outer 
lip thin, pillar lip adhering to and slightly reflected on the columella; base 
rounded. Diameter a quarter of an inch; thickness not an eighth. 
Found on the coast at Dunbar, by General Bingham, and in his cabinet; 
and we have lately met with it in the same locality. 
2. P. alba, pl. VIII, f. 48-49.—First Ed., pl. 51, f. 48-49. 
Shell depressed, with four milk-white rounded volutions, visible on both 
sides, encompassed hy the body; the second ones very slightly elevated 
above the sides of the body, the central ones sinking into a deep umbili- 
cus ; base rounded, the volutions retiring towards the middle, and winding 
to asmall central umbilicus; the whole crossed by very minute lines of 
growth, or obsolete strize ; aperture oblique, large, suborbicular, and white 
within; outer lip thin and plain; pillar lip adhering to the columella 
Diameter three-eighths of an inch, and about half that thickness. 
Found on the beach betwixt St Abb’s Head and Dunbar by General 
Bingham, and in his cabinet ; and we have lately found it close to Dun- 
bar. 
This species has much the aspect of /’lanorbis corneus, but differs from 
it in the volutions of the apical side, being the reverse of that shell in 
the inside being parallel with the sides of the body, and in the others bemg 
thicker and less sunk than the under side of the P. corneus, in its young 
state. 
Genus 24.—Scatarta.—Lamarck. 
Shell turreted; volutions gibbous, very distinct, sometimes quite 
separated, with a spiral void in place of a suture, with close or dis- 
tant, longitudinal, elevated, acute, oblique ribs, sometimes so thick- 
ened as to present a varicose appearance, but in a few instances so 
depressed that they hardly appear above the surface; aperture for 
the most part orbicular, or generally a little longer than broad, with 
its margin united all round, thickened, and reflected, particularly so 
in such species as the volutions are apart from each other; lower 
part of the columella indistinctly canaliculate; aperture provided 
with a thin, horny, spiral operculum. 
1. S. communis, pl. VIL, f. 13.—First Ed., pl. 51, f. 13; Scalarza com- 
munis ; Lamarck, VI, pl. 2,"p- 228; Scalaria clathrus ; Fleming, Brit. An., 
p- 311; Turbo clathrus ; Pennant, Brit. Zool., 1V, p. 129, pl. 82, f. 3; 
Maton and Racket, Linn. Trans., VIII, p. 170; Montagu, Sup. p. 120; 
T. clathratulus ; Donovan, Brit. Sh., pl. 28, upper figs. ; Turbo scalaris ; 
Montagu, p. 296. 
