176 OLIVIDA. 
very short, the suture not canaliculated to the apex; aperture 
rather large and wide, inner lip somewhat tortuous, with a large 
callosity behind, incurved in the middle, and two or three oblique 
anterior plaits. Head and tentacles concealed ; mantie with a 
large, thick, fleshy appendage behind, partially covering the 
spire; foot very voluminous, truncate posteriorly, shield with 
the side-lobes very large and rounded. Opereulum small, half 
ovate, with subapical nucleus. Appears to connect Oliva with 
Ancillaria. Brazil, W. and S. Africa: ‘O. Brasiliana, Lam. 
(lvag TEYS 
PLOCHELZA, Gabb. Shell olive-shaped, suture nearly obsolete, 
as in Ancillaria; spire short; outer lip internally thickened in 
the middle; inner lip callous, with several transverse folds, of 
which the upper are smallest; columella ‘strongly recurved at 
the base, like a Dibaphus. P. crasstlabra,Gabb. Tertiary ; West 
Indies. 
SuspraMIty ANCILLARIINA. 
Head concealed; eyes none; tentacles rudimentary ; mantle 
with a tapering lobe in front; foot voluminous, bifid behind, 
shield-grooved on the upper surface, side-lobes not much pro- 
duced. Operculum small, ovate, acute, sometimes entirely 
wanting. Shell usually polished; sutures covered by callus; 
whorls smooth ; aperture effuse, the columella variously grooved 
and twisted in front. 
Monoptyema, Lea. 
Syn.—Not Monoptygma, Gray. Chiloptygma, H. and A. Ad. 
Distr.—Fossil. Eocene; United States. MM. Alabamensis, Lea 
(lvi, 74). One recent species, M. exigua, Sowb., is possibly a 
monstrosity. 
Shell with elevated spire and callous columella, the latter with 
a subcentral conical tooth-like callous projection. Dr. Lea’s 
second species of his genus is an Actzon. 
ANCILLARIA, Lam. 
EHtym.— Ancilla, a maiden. 
Syn.—Ancillopsis, Conr. Sparella, Gray. Anaulax, Roissy. 
Ancilla, Lam. Amalda, H.and A. Adams. Sandella Gray. 
Distr.—17 sp. Red Sea, Indian Ocean, Australia, Japan, West 
Indies. Fossil. Eocene—; U.S8., Eur. A. Tankervillet, Swains. 
(lvi, 73). 
Shell oblong or subeylindrical, thick and smooth in the typical 
species ; body-whorl usually swollen; sutures covered by enamel ; 
aperture broadly effuse below; columella (typically) not umbili- 
cated, with a few oblique anterior plaits. The revolving basal 
groove ends occ¢asionally in a slight anterior labral projection or 
tooth. its » psa oe Pi 
