MARGINELLID. 173 
MARGINELLA, Lamarck. 
Etym.—Diminutive of Margo, a rim. 
Syn.—Volvarina, Hinds. Eratoidea, Weink. Egouena and 
Serrata, Jousseaume. Bullata, Jouss. Granula, Jouss. Canal- 
ispira, Jouss. Balanetta, Jouss. Porcellanella and Microspira, 
Conr. Pseudomarginella, Carriere, 1881. 
Distr.—200 sp. Tropical and subtropical ; Caribbean, West 
African, Indo-Pacific, etc. Fossil,75sp. Cretaceous (?), Eocene—; 
United States, Europe, Australia. J. glabella, Linn. (lv, 56). 
Shell ovately oblong to subcylindrical, smooth, polished, 
sometimes longitudinally ribbed; spire short-conical or con- 
cealed; aperture narrow, elongated, obtuse or truncated in front; 
columella plicate; outer lip with a thick marginal varix, its inner 
margin smooth or crenulated. 
GLABELLA, Swainson. Volutiform, spire more or less “conic, 
well developed, usually longitudinally plaited about the shoulder 
of the body-whorl; pillar with distinct basal plaits; lip thick, 
toothed or crenate, rarely smooth within. MV. Adansonii, Kiener 
(lv, 57). 
pruUNUM, H. and A. Adams. Shell smooth, oval, spire slightly 
prominent ; outer lip thick, unarmed, inner lip frequently forming 
a callous deposit; color light gray or yellowish gray, usually 
without distinct bands or spots; exterior lip-margin sometimes 
orange-brown. M. marginata, Born (lv, 59, 60). 
cryptospirA, Hinds. Shell swollen, smooth, spire very short, 
nearly concealed ; columella five- or six-plaited ; outer lip thick- 
ened, smooth within ; color gray or yellowish olivaceous, usually 
without bands, sometimes interruptedly banded or strigate. 
Nearly related to Prunum, but differs in having a shorter spire, 
less callous deposit and more columellar teeth or plaits. I. 
elegans, Gmel. (lv, 58). 
VOLUTELLA, Swainson.  Bulliform, ovate-oblong; spire de- 
pressed ; pillar with four oblique plaits at the fore-part, lip smooth 
within. MM. bullata, Born (lv, 61). 
PERSICULA, Schum. Shell Bulliform, spire depressed or sunken; 
usually banded or spotted ; aperture long, the outer lip generally 
denticulated within, with a posterior channel, inner lip with a 
callosity posteriorly, four plaits anteriorly, with smaller ones 
behind them, becoming obsolete. . persicula, Linn. (lv, 62). 
GIBBERULA, Swainson. Shell suboval; spire slightly promi- 
nent, outer lip posteriorly dilated and gibbous, not denticulated. 
A group of small species differing from Persicula in the Spire 
being slightly prominent instead of sunken. J. miliaria, Linn. 
cLosIA, Gray. Spire involute; lip thick, usually dentate 
within; columella heavily incrusted with callus, the two lower 
plaits very prominent, two upper ones not so prominent, above 
them there are sometimes false folds or transverse ridges as in 
