124 
NERITA. NERITE. 
vided, and not quite regular in their size; the smooth or 
upper termination produced obliquely into a syphon, the 
other end rounded: length nearly a quarter of an inch. 
In fine sand, near Dunbar. 
NERITA. NERITE. 
Shell with a single valve, spiral, gibbous, flat- 
tish beneath : aperture half orbicular ) the pillar- 
lip transverse, flattish, and truncate. 
A. The lips without teeth. 1 to 10. 
B. The pillar-lip toothed. 11. 
1. Nerita sulcata. Grooved Nerite. Fig. 56,57. 
Nerita glabrissimus. Brown, JVem. Soc. pi. 24. f. 12. 
Shell somewhat globular, semitransparent, ofablueish- 
white color: spires four, rather pointed, swollen and well- 
defined ; the first very large, the others placed somewhat 
laterally ; all of them marked with rather remote longitu- 
dinal striae, which are very fine and placed a little obliquely: 
aperture broad crescent-shaped; the outer lip very thin; 
pillar-lip rather flat, projecting a little in the middle over 
the perforation winch is long and deep, and marked witha 
few longitudinal lines : diameter the eighth of an inch. 
Two specimens of this shell we found among the sand in 
Dublin bay. From the foreign specimens in our cabinet 
they differ in size and color, the latter being clear white, 
and three-quarters of an inch in diameter: the grooves also 
of our shell are merely fine striae, and placed at more re¬ 
mote distances, v. m. 
2. Nerita glaucina. Livid Nerite. -V • 71 * 
Lister , pi. 568. f. 19— Pennant, pi. 90. f. 1—Da Coiic, 
pi- 5. f. 7— Donovan, pi. 20. f. 1— Dorset Cat. pi. 21. f. ]. 
Shell somewhat orbicular, glossy, slightly wrinkled lon¬ 
gitudinally, of a livid grey or pale ches nut-brown color, 
with mostly a chain of deep chesnut-brown zigzag short 
lines surrounding the junctions of the volutions, and which 
are disposed in a longitudinal direction: spires six, round¬ 
ed and well defined; the first very large and tumid; the 
others 
