CERITHIID^. 24 T 



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 A^aricose, apex submanimillate ; aperture ovate, the 

 columella more or less truncate. 



DiALA, 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, 

 A. Ad. 



STYLiFERiNA, A. Ad., 1860. Diaphauous, conical-turreted ; 

 whorls smooth, convex ; apex mucronate; aperture subquadrate ; 

 inner lip straight, 2 sp. Japan. A. orthochila, A. Ad. 



Family 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 ; e^^es 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. 



Cerithium, Bruguiere. 



Etym — Gei-ation, 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, etc. G.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. Uneatus, Lam. (Ixix, 50). 



CERiTHiODERMA, Courad. Acutely ovate, striate ; labrum 

 grooved and umbilicate ; columella recurved inferiorly or sub- 

 truncate ; aperture patulous, margin obtusely rounded inferiorly; 

 beak very short, narrow, recurved. C. priwa, Conr. (Ixix, 51). 

 Eocene ; Alabama. 



COLINA, H. and A. Adams. Shell elongated, whorls numerous, 

 convex, nodulous, with revolving striae ; aperture oval, prolonged 

 in front into a short, recurved canal ; columella simple, oblique; 

 outer lip expanded and reflexed. The middle whorls are gibbous, 



