310 TROCHIDA. 
point anteriorly. 2 sp. Indo-Pacific. 7. Nilotieus, Linn. 
(xxx, 39). 
RocHIA, Gray. Shell with a strong fold on the pillar-lip, and 
a deep sinus behind, near the whorl. TT. acutangulus, Chemn. 
Philippines, Australia. 
CARDINALIA, Gray. Conical, whorls flattened, granulated, the 
the last angular, not umbilicated ; columella simple above, a little 
twisted, and terminating in a point below; outer lip slightly 
toothed basally. 7. virgatus, Gmel. (1xxxi, 40). Indian Ocean, 
Philippines. 
rEcTUs, Montfort. (Pyramis, Schum., 1817. Pyramidea, 
Swains.) Shell conical, not umbilicated; whorls smooth or 
tuberculated, the last angular; aperture wider than long; colu- 
mella short, spirally twisted, terminating in a point anteriorly. 
9 sp. Red Sea, Indo-Pacific. 7. triserialis, Lam. (1xxxi, 41). 
POLYDONTA, Schum., 1817. (Lamprostoma, Swains.) Shell 
conical, not umbilicated ; whorls mostly granular, the last angu- 
lated ; aperture subrhomboidal; columella spirally twisted, rib- 
like and plicate, forming a false umbilicus; base of aperture 
rib-like and dentated, joining the columellar dentitions. 17 sp. 
Indo-Pacific, Polynesia. 7. maculatus, Linn. (1xxxi, 42). 
PRACIA, Gray. Shell with the pillar-lip twisted, simple ; axial 
cavity deep, narrow, with a distinct, narrow, central, spiral rib. 
T. elegantulus, Wood, is the only species. 
ANTHORA, Gray. Shell with the pillar-lip twisted, simple ; 
axial cavity moderate, narrow, with several opaque, subspiral 
ridges. 7’. viridis, Gmel. 
BELANGERIA, Fisher. No diagnosis published. 7. scabrosus, 
Phil. (Ixxix, 15). Indian Ocean. 
INFUNDIBULUM, Montfort. (Carinidea, Swains.) Shell conical ; 
whorls flattened, the last angular, base concave; columella 
without teeth or with the teeth obsolete. 6 sp. Indo-Pacific, 
Red Sea. 7. concavus, Linn. 
OMPHALIUS, Phil. Shell convex-trochiform, umbilicated ; whorls 
with revolving series of granules, the last whorl bluntly angu- 
lated at the periphery ; umbilicus encircled by a callosity ; colu- 
mellar lip terminated by a tooth anteriorly, below which are 
small tubercles; outer lip usually internally grooved. 11 sp. 
East and West tropical America, West Indies. 7. viridulus, 
Gmel. 
ISANDRA, H. and A. Adams. (Eudora, Ad.) Shell polished, 
subeonoidal, whorls rounded ; aperture subquadrangular ; inner 
lip straight, dentate below, forming an angle at its basal union 
with the outer lip; umbilicus open, profound, surrounded with 
crenulations. Australia and Philippines. 7’. coronatus, A. Ad. 
(xxix: 16’). 
nrivona, Gray. (Cittarium, Phil. Meleagris, Montf.) Shell 
