NEKITINA. 
47 
11. 194. ; Drap. p. 31. 1. 1. f. 1 — 14. ; 'Brard, p. 194. t. 7. f. 
9. 10. 12. ; Mont, p. 470. ; Turt. Diet. 127. ; Forbes and 
Hanley, B.M. iii. 3. t. 71. f. 1. 2. t. H. H. f. 1. — Nerita 
fontinalis, Brard, Coq. Par. 196. t. 7. f. 11. — I^eritina 
zebrina, N. peloponnensis. numidica, N. Mittreana. 
Becluz. — Keritina intexta. Villa. — Neritina Sardon and 
N. trifasciata. Menke. — Neritina Hildreichii. Schwerz, 
— Nerita Bourguignati. Recluz, Jour. Conch. 1825, 293. 
— Nerita Prevostiana. Pfeiffer, D. Moll. iii. 49. t. 8. f. 11, 
12. — Nerita thermalis. Boubee in Bull, 1833, 12. — Theo- 
doxus lutetianus. De Montfort, ii. p. 351. — Neritina 
fontinalis. Brard, Hist. C. 196. t. 7. f. 11. 13. ; Pet. Gaz. 
t. 91. f. 3.; List. Conch, ii. 1. 38. ; Swamm. B. N. 80. t. 10. 
f. 2. — Neritina dalmatica. Sow. C. Ulus. f. 57. — Neritina 
variabilis. Hecart. Moll. Vail. 1. 146. 
In slow rivers^ adhering to stones. 
Animal white ; head and back of the neck blackish ; 
hinder part of the foot sometimes black spotted ; ten- 
tacle long^ white^ with blackish line. 
Shell about three eighths of an inch long, and two 
broad, convex above and flat underneath, obscurely 
striate transversely, of a greenish or whitish colour, 
variously chequered with spots or bands of white, 
brown, purple, or pink; spire consisting of three 
volutions, the first very large, oblong, and oblique, 
the others small and lateral; aperture horizontal, 
semielliptic, with the margin sharp and entire ; pillar 
white, transverse, sloping down to a sharp edge, and 
quite entire ; operculum semilunar, yellowish, with 
an orange border, and underneath is a strong raised 
grooved spire at one end. 
The shells are often covered with calcareous in- 
crustations, deposited by the water, which make 
them look like pieces of dirt, and thus escape being 
seized on by the fish. 
The continental conchologists have described se- 
