8 GENUS DOLIUM. 
4. DOLIUM MACULATUM, Lam. The Speckled Tun. 
(Collect. Mass. Lam.) List., Conch., t. 899, fig. 19. 
Pl. Ill, fig. 4. 
D. test4 ovato-globosa, ventricoso-inflata, tenui, griseola; costis con- 
vexis, distantibus, fulvo aut rufo maculatis; interstitiis strid prominula 
divisis. 
Shell ovate-globose, ventricose, thin; spire generally short, 
composed of six whirls, slightly flattened above; the last, 
very large and very convex. All these whirls are encircled 
by wide and distant ribs, slightly convex, ten in number 
upon the last whirl; others, more narrow, are placed alter- 
nately within the furrows, which are wide and very slightly 
striated. The surface of this shell is of a white color, slightly 
grayish, and sometimes rose-colored ; ornamented upon the — 
ribs, with alternate white and red spots, often also orange, 
which, disposed thus in regular series, present a beautiful 
appearance. ‘The aperture is very large, colored within of a 
chestnut tint. The right lip is thin, notched, canaliculated 
within, and its edge is white and undulated. ‘The left lip 
is only slightly perceptible towards the base, where it forms 
a part of the umbilicus, which is hardly developed. The 
columella is twisted spirally, and furnished externally, even to 
the emargination of the base, with longitudinal ribs. 
Length 5 inches. Width 33 inches. 
Inhabits the Indian Ocean, the coasts of Coromandel, of 
Ceylon, and the western coast of Africa. 
The common name of this species, is the Tun; it is very 
large. Its ribs, wide and distant, its furrows equally wide, ren- 
der it easily distinguishable. 
