MARINE MOLLUSCA OF THE UNITED STATES. 53 
Shell smooth, bright ; spire short or cancelled ; aperture truncated in front ; 
columella plaited; outer lip of adult with thickened margin. 
MARGINELLA, Lamarck. 
Genus VOLUTA, Linnzus. 
Syst. Nat., edit. x. 729. 1758. 
1. V. Junonia, Chemnitz. Fig. 87. 
Conch. Cab., xi. t. 177, f. 1708, 4. 1799. 
Shell fusiformly ovate, spire short, obtuse at the apex; whorls 
smooth or minutely decussately striated, rather swollen around the 
upper part; columella strongly four-plaited; aperture rather 
long; lip simple; cream color, regularly painted with rows of deep 
red spots. 
Georgia, Florida. 
This is the most rare and valuable American marine shell; spe- 
cimens in good condition sell for fifty to one hundred dollars. Its 
occurrence has been noticed at a number of localities, but it is 
never plentiful. 
Genus MITRA, Humphreys. 
Mus. Callon. 1797, 
1. M. Granutosa, Lamarck. Fig. 88. 
Anim. s. Vert., vii. 304. 1822. 
Shell oblong, ovate, spire acuminately turreted, sutures rather 
deep; whorls closely decussated with granular ridges; columella 
four-plaited, slightly umbilicated ; aperture rather short. 
North Carolina, W. Indies. 
Genus MARGINELLA, Lamarck. 
Prodr. 1799. 
1. M. egurrata, Dillwyn. Fig. 89, a, b. 
(Voluta.) Desc. Cat. 526. 1817 
Marginella longivaricosa, Lamarck, Anim. s. Vert., vii. 858. 1822. 
Shell somewhat pyriformly oblong, flesh-colored, obscurely two- 
banded, flaked throughout with opaque white spots; spire small, 
scarcely exserted, callous; whorls rather gibbous around the upper 
part; lip broadly thickened, white, distantly spotted with reddish- 
fawn. 
North Carolina to West Indies. 
2. M. roscipa, Redfield. Fig. 90. 
Proc. Acad, Nat. Sciences Philad., 174. 1860. 
Marginella apicina of American authors (not Menke). 
Shell rhombic-ovate, polished, grayish-brown, minutely flecked 
