194 
TURBO. TURBAN. 
very large and tumid, the others placed laterally hut pro¬ 
duced rounded and well defined : color yellowish-white or 
inclining to purple, with various shades of green on the se¬ 
cond and smaller volutions ; sometimes crimson, dull red, 
or fulvous, often without hands, but generally with from 
one to three deep purple or pale bands on the body volu¬ 
tions, which do not extend to the remaining ones or in a 
faint degree only ; the tip sometimes clear white, but al¬ 
most always with a purple tinge: aperture ample, nearly 
orbicular: the outer-lip extremely thin, running nearly in a 
straight direction at the base, by which the outer point at 
the pillar-lip is somewhat angular : pillar-lip with a long 
groove, and small but deep perforation : diameter about "a 
quarter of an inch. 
Montagu, at p. 151 of his Supplement, has erroneously, 
we think, considered this shell as the young of Nerita rufa, 
merely from the circumstance of having found it, probably 
in a dead state, of a thicker consistence than that which lie 
had described as Helix Lacuna, at p.428 of his work; ac¬ 
knowledging nevertheless that it differs from N. rufa, in 
having the groove and the perforation placed upon thepilbr- 
lip> instead of the perforation being placed behind the pillar 
as in all that genus, a difference which is never known in¬ 
terchangeably to take place. We have examined very nu¬ 
merous specimens, both alive and dead, collected in various 
parts of England and Ireland, all corresponding with his 
and our own descriptions,but exceedingly variable in colors 
and markings ; and if we are in error, we must despair of 
being able to procure the Helix Lacuna of Montagu. Da 
Costa has well figured it, and admirably described it. v,v. 
4. Turbo quadrifasciatus. Four-banded Turban . 
Montagu , pi. 20. f. /• 
Shell somewhat conic, strong, semitransparent, rather 
obtuse at the point, white with a greenish tinge, coyered 
v hen fresh with a slightly wrinkled skin, very minutely 
striate transversely: spires four or five, rounded and well 
efined ; the first very large, with a slight keel-like ridge 
lound the base, and generally four faint brown bands which 
sometimes unite and form two broader ones ; on the next 
' olutxon are also ofteu two bands ; aperture somewhat or¬ 
bicular , 
