OLIVID. ie 
Distr.—55 sp. Subtropical; East and West America, W. 
Africa, India, China, Polynesia. Fossil. Eocene—. O. erythro- 
stoma, Lam. (lvi, 67). 
Shell oblong, subcylindrical, polished; spire short, conic ; 
suture canaliculated ; aperture long and narrow, anteriorly widely 
notched ; columella obliquely plicate, suleate or striate in front, 
posteriorly callous ; outer lip simple. 
Animal with tentacles enlarged at the base; mantle with a 
posterior filament lodged in the channeled suture of the spire ; 
foot long and acuminate behind, shield with the side-lobes taper- 
ing, acute, small. 
Operculum none, in the restricted group. 
Like most shells enveloped in the voluminous foot of the 
animal, Oliva has no epidermis. The shell has an under layer 
with different pattern of coloring, but this is never exposed 
except in worn specimens, or else artificially by the aid of acids: 
hence it is evident that unlike the Cyprzea, which changes its 
pattern upon becoming mature, the two layers of Oliva are 
simultaneously produced at all stages of its growth. The interior 
volutions are often absorbed till they become of paper-like 
tenuity in order to accommodate the increasing bulk of the 
animal. 
LAMPRODOMA, Swainson. (Ramola, Gray.) Spire acuminate, 
elevated, suture canaliculated ; inner lip simple posteriorly, but 
regularly, numerously plicate anteriorly, the plice more trans- 
verse than in the typical group. 0. volutella (lvi, 68—the only 
species) is found in vast numbers over many acres on the sandy 
beach west of the city of Panama. Some time after the retreat 
of the tide, it is found crawling about with much vivacity on 
the wet sand. The shell, while the animal is moving, is wholly 
covered with the foot-lobes, and these are entirely concealed 
with a thick coat of sand. When the first wave of the returning 
tide strikes them, washing off this coating, they instantly bury 
themselves. 
CALLIANAX, H.and A. Adams. (Scaphula, Gray.) Shell swollen, 
ovate, with short conical spire and channeled sutures ; aperture 
wide, effuse in front; inner lip with a very thick, defined callus, 
and a few frequently indistinct anterior plaits. 2 sp. W. Coast 
of America, Patagonia. 0. biplicata, Sowb. (lvi, 69). 
AGARONIA, Gray. (Tortoliva, Conr. Hiatula, Swains.) Shell 
thin, oliviform, but a little effuse anteriorly ; spire acuminate ; 
aperture rather wide, effuse below; columella not thickened 
posteriorly, tumid, with a few oblique plaits in front. Has a 
small operculum. QO. hiatula, Lam. (lvi, 70). 
OLIVANCILLARIA, d’Orb. (Utriculina, Gray.  Lintricula, H. 
and A. Adams. Scaphula, Swains. Anazola and Claneophila, 
Gray.) Shell smooth, wide, oblong, last whorl swollen; spire 
