34 NATICA. 



depressed area beneath the suture ; umbilicus wide, spirally 

 striate, nearly filled by a wide, somewhat overhanging callus, 

 which is often rugose or obsoletel}' pitted ; gray, j'ellowish 

 brown, livid, etc., callus and interior of aperture chocolate. 



Length, 3 inches. 



New England to Florida^ Gulf Shores of the United Stales, etc. 



The species figured by Reeve under this name is Lunatia 

 heros, Say ; Sowerby has also confounded the two species. N. 

 Delessertiana, Recluz, combines the tj'pical form with that 

 described b}- Gould as N.fossata (fig. 4). The latter is scarcely 

 entitled to even varietal rank ; it is distinguished by the umbili- 

 cus being more decidedly striate and bounded b}' an acute ridge, 

 but these features common, perhaps predominant in Florida 

 specimens, seem to shade away with the more northern distribu- 

 tion. N. Campeachiensis, Recluz (fig. 10), and iV". Texasiana, 

 Phil. (fig. 5), are sj^nonyms. The bowl-shaped sandy nidimental 

 ribbon is a common and verj^ curious sea-shore object ; it is very 

 ditferent in form and structure from the capsules of other gastro- 

 pod genera. 



N. Recluziana, Desh. PI. 12, fig. 1. 



Shell solid, conically glol)ose, columolla strongly callous from 

 the superior function of the outer lip, nearly filling the iun1)ilicus ; 

 fawn-color, or j-ellowish brown, lighter or whitish below, interior 

 chocolate, callus usually white. Length, 3 inches. 



California, N. W. Coast of Mexico. 



The figure is more than usuall}' conical, the general form being 

 somewhat more conical than in N. duplicata. 



N. GLAUCA, Humboldt. PI. 11, figs. 97, 98. 



Shell very much depressed, rugosel}^ striate, concavely exca- 

 vated beneath, the umbilicus partly overhung by a thin, tongue- 

 like callus ; wliitish, or yellowisli, broadly chestnut banded 

 above, callus and interior chestnut-color. 



L. 1-25, diam. 2*25 inches. 



Acapulco to Panama. 



It is N. Bonplandi, Val. and N. patula, Sowb. The latter 



name should perhaps have priority were it not preoccupied for a 



fossil species. 



