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Genus 18.—Lacuna.—Turton. 
Shell thin, subglobose, or ovately subconical; spire short, 
sometimes very short, with a somewhat obtuse apex ; yolutions 
somewhat tumid; aperture subrotund, or subovate; outer lip 
thin, never reflected, and incomplete posteriorly; columella 
usually broad, and depressed, with an elongated, narrow umbili- 
cus behind it; whole outer surface covered with a very thin, 
horny epidermis. 
1. Lacuna retusa, pl. X, f. 52, 53. 
Lutea lacuna, First Ed., pl. 46, f. 52, 53. 
Shell very thin, subglobose, hyaline, and of a greenish-brown 
colour ; spire extremely small, hardly elevated above the body, 
and consisting of two yolutions; body with a subcarinated zone 
in the centre; aperture obliquely ovate; outer lip thin, and 
sharp at the edge; pillar lip narrowly reflected, with a slight 
slit behind. 
Found at Dunbar, by General Bingham. 
2. Lacuna PpALLipuLa, pl. XIII, £17, 19. MNatica palli- 
dula, p. 25. 
3. Lacuna vineTa, pl. XIII, f. 46. Phasianella vinctus, 
p- 9. 
4, Lacuna quaprirasciaTa, pl. XIII, f. 35. Turbo qua- 
drifasciatus, p. 16. 
5. Lacuna pirasciata, pl. XIII, f. 44, 45. Phasianella 
bifasciata, p. 10. 
6. Lacuna cornea, pl. XIII, f. 47. 
p- 10. 
7. Lacuna cana is, pl. XIII, f. 48. 
p: 9. 
8. Lacuna FascraTa, pl. XIII, f. 54. 
ciata, p. 10. 
9. Lacuna Monracut, pl. LVII, f. 8. 
Helix lacuna, Montagu, p. 428, pl. 13, f. 6; Maton and 
Rackett, p. 201. 
Shell thin, smooth, pellucid, subglobose, of a light horn- 
colour; body large, tumid; spire small, consisting of three 
Phasianella cornea, 
Phasianella canalis, 
Phasianella fas- 
depressed volutions, the apicial one very small, and placed 
somewhat laterally; aperture large, suboval; outer lip very 
thin; pillar lip reflected, and white; with a groove-like canal, 
which terminates in a small, but deep umbilicus. Length a 
quarter of an inch; breadth nearly the same. 
Montagu,—on whose authority we give this shell,—says, “it 
must not be confounded with Lacuna pallidula, whose pillar 
lip is somewhat of the same form, but much broader; the smal- 
ler volutions more lateral, and more compressed; the body and 
mouth also are greatly larger.” 
Found on the Devonshire coast, and on the shore near 
Southampton. 
Genus 2].—Marcarira.—Leach. 
Shell trochiform, depressed; volutions few, well defined by 
the suture; base of body subdepressed, and provided with a 
large umbilicus; aperture nearly circular, and covered by a 
horny operculum, consisting of few yolutions. 
1. Marcarira aurea, pl. X, f.23. Turbo aureus, p. 17. 
2. Marcarira carne, pl. X, f. 36,37. Turbo carneus, 
p- 17 
MOLLUSCA. 
3. MArGARITA MARGARITACEA, pl. X, f. 28, 29. Turbo 
margarita, p. 17. 
4. Marcarira oxtvacka, pl. X, f. 30,31. Turbo olivacea, 
p: 17. 
Genus 22.—LitTrorina.—Férussac. 
Shell turbinated, generally ovate, or oblong-ovate, for the 
most part thick and solid; spire acuminated and subturreted 
in some species; very short and obtuse at the apex in others; 
aperture entire, round, or slightly elliptical, sometimes a little 
acute obove; outer lip sharp-edged, thickened within; colu- 
mella somewhat flattened ; operculum spiral, horny, and elastic, 
consisting of a few rapidly enlarging volutions, and furnished 
with a central nucleus. 
This genus to be substituted for that of TurBo, page 15: it 
also comprehends the genus NERITOIDES, p. 25, and consists of 
the following species, namely, 
1. Lirrorina LitTorEa, pl. X, f. 1, 2, 3, 4, 5, 6, 7, 8, 9. 
Turbo littoreus, p. 15. 
2. Lirrorina rupis, pl. X, f. 10, 11, 12, 13, 14, and 25. 
Turbo rudis, p. 15. 
3. Lirrortna Jucosa, pl. X, f. 15, 16. Turbo jugosus, 
p- 16. 
4, Lirrorina 
brosus, p. 16. 
5. Lirrorina 
p- 16. 
6. Lirrorina 
p- 16. 
7. LirtTorina 
8. LirrorIna 
9. LirroriIna 
p- 16. 
10. Lirrorina NERITIFORMA, pl. X, f. 24. Turbo neriti- 
Sormis, p. 17. 
11. Lirrorrna Fasatis, pl. X, f. 38, 39. 
p- 17. 
12. Lirrorina sTRIATULA, pl. X, f. 33, 34. 
tulus, p. 17. 
13. Lirrorina NERITOIDEs, pl. XIII, f. 14, 15, 21, 22. 
Nevitoides littoralis, p. 25. 
14. Lirrorina sExatitts, pl. LVII, f. 21, 22. 
Littorina sexatilis, Johnston, Trans. Berwick. Nat. Hist. 
Club, III, p. 268; Macgillivray, Moll. Ab., p. 138; Turbo sex- 
atilis, Bean, MSS. 
Shell moderately thick, subglobose, slightly conical; length 
and diameter nearly equal; spire about a third of the length, 
consisting of three spirally striated volutions, divided by a deep, 
well defined suture; body somewhat flattened above, and a little 
angular below; aperture ample, nearly orbicular, and deep cho- 
colate-brown within; outer lip thin, and united to the body in 
an angular form; inner lip narrowly reflected on the columella, 
and provided with a slight callosity, and is of a brownish-purple 
colour; external surface varying in colour, being white, yellow, 
or cinereous, tesselated with dull brown or olive. Length and 
diameter upwards of a quarter of an inch. 
Found on the Yorkshire coast, by Mr. Bean, of Scarborough; 
and Professor Macgillivray gives as localities the Aberdeenshire 
and Kincardine coasts. 
TENEBROSA, pl. X, f. 18,19. Turbo tene- 
peTR#A, pl. X, f. 17. Turbo petreus, 
LABIATA, pl. X, f. 20,21. Turbo labiata, 
VENTRICOSA. Turbo ventricosus, p. 16. 
DISPAR, pl. X, f.22. Turbo dispar, p. 16. 
ziczac, pl. X, f. 26, 27. Turbo ziczac, 
Turbo fabalis, 
Turbo stria- 
