34 NATICA. 



depressed area beneath the suture ; umbilicus wide, spirally 

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

 which is often rugose or obsoletely pitted ; gray, yellowish 

 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 ; Sowerb}^ has also confounded the two species. N. 

 Delessertiana, Recluz, combines the typical form with that 

 described by 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 by an acute ridge, 

 but these features common, perhaps predominant in Florida 

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

 tion. N. Gampeachiensis, Recluz (fig. 10), and N. Texasiana, 

 Phil. (fig. 5), are synonyms. The bowl-shaped sandy nidimental 

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

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

 pod genera. 



N. RECLUZIANA, Desh. PL 12, fig. 1. 



Shell solid, conically globose, columella strongly callous from 

 the superior function of the outer lip, nearly filling the umbilicus ; 

 fawn-color, or yellowish brown, lighter or whitish below, interior 

 chocolate, callus usually white. Length, 3 inches. 



California, N. W. Coast of Mc.i'ico. 



The figure is more than usually conical, the general form being 

 somewhat more conical than in N. duplicata. 



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



Shell very much depressed, rugosely striate, concavely exca- 

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

 like callus; whitish, or yellowish, broadly chestnut banded 

 above, callus and interior chestnut-color. 



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



Acapulco to Panama. 



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

 name should perhaps have priority were it not preoccupied for a 

 fossil species. 



