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CERITHIIDA. 
ALABA, H. and A. Ad., 1862. 
Distr.—24 sp. Japan, Australia, Mazatlan, West Indies. A. 
tervaricosa, C. B. Ad. 
Shell ovate, conical or elongated, subdiaphanous; whorls 
plicate or varicose, apex submammillate; aperture ovate, the 
columella more or less truncate. ; 
pDIALA, A. Ad., 1862. Whorls not varicose, sometimes noduled 
around the middle; columella straightish, not truncated; labrum 
not thickened. 5 sp. Philippines, Australia, Japan. A. varia, 
AC Ad. 
STYLIFFRINA, A. Ad., 1860. Diaphanous, conical-turreted ; 
whorls smooth, convex ; apex mucronate; aperture subquadrate ; 
inner lip straight. 2sp. Japan. A. orthochila, A. Ad. 
Famity CERITHIID&. 
Shell spiral, elongated, many-whorled, frequently varicose ; 
aperture channeled in front, with a less distinct posterior canal; 
lip generally expanded in the adult; operculum horny and 
Spiral. 
Animal with a short muzzle, typically not retractile ; tentacles 
distant, slender; eyes on short pedicels, connate with the tenta- 
cles; mantle-margin with a rudimentary siphonal fold; tongue 
armed with a single series of median teeth, and three laterals or 
uncini. Marine, estuary, or fresh water. 
CrritHiuM, Bruguiere. 
Etym —Ceration, a small horn. 
Distr.—136 sp. Marine. World-wide, the typical species 
tropical. Norway, Britain, Mediterranean, West Indies, India, 
Australia, China, Pacific, Galapagos. Fossil, 460 sp. Trias 
Britain, France, United States, ete. 0. fusiforme (Ixix, 49). 
Shell turreted, many-whorled, with indistinct varices ; aperture 
small, with a tortuous canal in front; outer lip expanded ; inner 
lip thickened ; operculum horny, spiral. 
Some of the species emit a bright green fluid when molested. 
VERTAGUS, Klein. (Rhinoclavis, Swains. Lampanella, Morch.) 
Canal strongly recurved, columella with an oblique median pli- 
cation. C. lineatus, Lam. (xix, 50). 
CERITHIODERMA, Conrad. Acutely ovate, striate; labrum 
grooved and umbilicate; columella recurved inferiorly or sub- 
truncate ; aperture patulous, margin obtusely rounded inferiorly ; 
beak very short, narrow, recurved. (. prima, Conr. (1xix, 51). 
Kocene; Alabama. 
cotina, H. and A. Adams. Shell elongated, whorls numerous, 
convex, nodulous, with revolving striz ; aperture oval, prolonged 
in front into a short, recurved canal; columella simple, oblique; 
outer lip expanded and reflexed. The middle whorls are gzibbous, 

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