g GENUSDOLIUM. 



4. DOLIUM MACUL.ATUM, LAM. The Speckled Tun. 

 (Collect. MASS. LAM.) LIST., Conch., t. 899, fig. 19. 

 Pi. Ill, fig. 4. / 



D. testi ovato-globosd, ventricoso-inflata, tenui, griseola; costis con- 

 vexis, distantibus, fulvo aut rufo maculatis; interstitiis stria 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 3 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. 



