132 



The Dolia of the United States, 



lines formed by the stria; of growth; these are numerous near the 

 aperture ; aperture semicircular ; outer lip thin, and crenulate, 

 with a strong callous ridge along its inferior edge, like the D. 

 Fasciatum ; pillar slightly umbilicate : length about five inches, 

 breadth three and a half inches. 



This shell was brought from the Pacific by the Rev. C. S. Stew- 

 art, chaplain in the U. S. navy, and late missionary to the Sand- 

 wich islands. I am indebted to his kindness and research for ma- 

 ny new and interesting objects of natural history. The fine speci- 

 men from which our drawing was made, is in the cabinet of my 

 friend, P. H. Nicklin, Esq. 



Dolium Perdix. Lin. 

 Shell ovate, thin, inflated, with about twenty flat circular ridges, 

 broader than the interstices between them ; colour greyish, or yel- 

 lowish brown, marbled or irregularly spotted with white ; aperture 

 large and somewhat semicircular ; outer lip thin, crenulate, and 

 thickened near its edge ; pillar umbilicate : length 4 or 5 inches, 

 and about three-fourths as broad. 



This species is not uncommon on the Florida Keys ; it has, I 

 think, never been found north of the Chesapeake bay ; but as a 

 small variety inhabits the coasts of Great Britain, it is probable 

 that future researches will discover it on our northern shores. In 

 Mr. Nicklin's cabinet there is a small specimen of this species, as 

 thick and ponderous as the D. Pomum. 



Dolium Plumatum. New species. 



Shell ovate, thin, brittle, inflated, with about seventeen broad 

 flat ribs ; those near the spire are almost obliterated ; spire deep- 

 ly grooved at the sutures ; colour pale brown, with transverse 

 hastate, white spots, having somewhat the appearance of a feath- 

 er ; outer lip thin, without any thickening of the shell near its 

 edge ; the inner surface of which is marked with a dark brown 

 band; pillar slightly umbilicate : length about five inches, breadth 

 three and three-fourths. 



I have but little doubt that this shell is the Buccinium Maculo- 

 «umof Solander ; figured by Seba, vol. 3, tab. 63, fig. 18. I have 

 compared our shell with that figure, and have been surprised that 

 DiUwyn should consider it only a variety of Perdix. The deep 

 grooving of the sutures of the spire and the absence of the callous, 

 or thickened ridge along the inner surface of the lip, sufficiently 



