192 
TURBO. TURBAN . 
vita tribes, as the imagination of different authors lias fan¬ 
cied their approximation. They are all of modern disco¬ 
very, and in none of them is the pillar-lip sufficiently trans¬ 
verse to entitle them to a place among the Nerites: we 
think therefore that they form a singularly appropriate di¬ 
vision, in contrast with the second, where the pillar-lip is 
placed rather transversely and flattened, but without the 
groove and perforation. 
A. The pillar-lip flattened, with a groove along its mid - 
die which terminates in a perforation , 1 to 6 . 
B. The pillar-lip fattened, without groove or perfora¬ 
tion, / to 15. 
C. Solid, and imperforate behind the pillar, 16 to 31. 
D. Solid, and perforated behind the pillar, 32 to 3-1. 
E. The spires cross-barred, or reticulate, 35 to 5G. 
F. 7apering, but not cross-barred, 5/ to 66 . 
G. The aperture toothed within: spires regular, 6 / 
to 78 . 
II. The spires reversed, 79 to 85. 
I. Flat, and resembling the Helix, 86 to 92. 
K. Indistinct species, 93 to 105. 
A. The pillar-lip fattened, with a groove along its middle, 
which terminates in a perforation, 1 to 6 . 
1. Turbo pallidnlus. Pallid Turban. Fig. 85, 86. 
Nerita pallidula. Da Costa, pi. 4. f. 4, 5— Donovan, 
pi. 16. f. 1— Dorset Cut. pi. 20. f. 4, 5. 
fehell transversely oval, thin, semitransparent, very ob¬ 
scurely striate longitudinally, and slightly wrinkled across, 
v hitish covered with a pale brown or greenish skin : spires 
three or four, the first very large and much spread towards 
the outer margin, the others placed laterally and flat upon 
the surf ace, or having the appearance of being rather sunk 
beneath it : aperture ample, nearly orbicular, slightly an¬ 
gular towards the pillar, much spread at the margin; the 
outer-lip thin, somewhat reflected and fringed by the outer 
skin ; pillar-lip broad, oblique but not transverse, with a 
rather narrow groove which terminates in a somewhat 
spiral 
