FAMILY 3. NERITACEA. 137 
dance off the leaves of palms, at least twenty feet from the ground, and 
full two or three hundred yards from any water. 
The Neritina corona and its cognate species constitute the genus Clithon 
of De Montford; the Neritina virginea, and those allied to it, form his 
genus Theodorus ; and the Neritina perversa, a fossil species, has been 
distinguished by the same author with the generic title of Velates. 
The shell of Neritina may be described as being thin, somewhat globose, 
and covered with an olive-green epidermis ; the spire is indistinct, or nearly 
obsolete, with the whorls sometimes ornamented with hollow spines ; the 
aperture is semicircular, and the columella is flat and spread out ; the lip 
is simple, and sometimes widely dilated on both sides. The operculum 
is testaceous, semiovate, and furnished with a sharp lateral appendage. 
Examples. 
Pl. CC. Fig. 14. 
NERITINA SUBGRANOSA, Sowerby, Conch. Illus. Cat., No. 41. p.3. 
Pl. CC. Fig. 15. 
Neritina Owenrana, Gray. Wood, Index Test. Supp. pl. 8. f.8. Sow- 
erby, Conch. Illus. Cat., No. 25. p. 2. 
PL. CC. Fig. 16. 
NeRITINA LatIsstMA (var.), Broderip, Proceedings Zool. Soc., 1832, 
Part II. p. 201. Sowerby, Conch. Illus. Cat., No. 29. p. 3. 
Pl. CC. Fig. 17. 
Neritina Lamarcxi, Deshayes, new edition of Lamarck, vol. viii. 
p- 578. 
Neritina auriculata (2), Lamarck. 
PI. CC. Fig. 18. 
NeriItTINA pIpeRINA, Chemnitz, Conch., vol. xi. p. 173. pl. 197. f. 1905 
and 1906. Lamarck, Anim. sans vert., new edit., vol. vill. p. 584. 
VOL. II. T 
