154 burma, it^ people axd phonrctwxs. 



cerithiix.t:. 



Cerithium, Adanson. 



Shell turritod. Columella tliickeneil. Some species emit a bright green lluitl 

 when molested. 



* ,, NoDuiosra, Lam. 



* ,, CiEErLESCENS, SoW. 



C. tuhercidahtm, Kien nou L. 



* ,, Traillii, Sow. Andamans. 



* ,, ARTrcrLATUii, Sow. 



,, ALVEOLUS. Andamans. 



Vertagus, Klein. 



Shell with a strongly recurved beak. 



* ,, OBELISCUS, Briig. 



* „ asper, L. 



* ,, KocHi, Phil. Andamans. 



* ,, TURRiTDS, Sow. Audamans. 



CoLiNA, H. and A. Adams. 



Shell elongate, swollen in the middle, the last whorl nearly smooth and some- 

 what pellucid. The outer lip dilated and refluxed. 



* ,, MACROsioiTA, Hinds. 



* ,, rup^FOEMis, Sow. 



POTAMIDIN.E. 



Tkifoeis, Deslai/es. 



Shell turrited, aperture produced anteriorly into a tubular canal, and sometimes 

 a posterior canal also present. Operculum round, paucispii'al. 



* ,, EUBER, Hinds. 



* ,, sp. (brown). 



* ,, scuLPTUS, Hinds. Andamans. 



Tymponotonos, Klein. 



Shell turrited, whorls spinous. Columella twisted. 



* ,, FLUTiATlLls, Michaud. 



,, ALATUS, Phil. 



,, EUEiPTERA, A. Adams. 



Telescoplum, Chemnitz. 

 Shell stout, pyramidal, smooth, last whorl angulated. Columella twisted. 



* ,, FuscuM, Chem. 



These marine marsh shells are collected for lime and the animal is also eaten. 



Cerithidea, Swainson. 



Shell turrited, apex decollated. 



* ,, OBTUSA, Lam. 



The Cerithidea are brackish-water forms, nnd are amphibious, and ran crawl out 

 of the water and suspend themselves by glutinous threads to trees and bushes. 



Beotia, H. Adams. 



Shell fusiform, whorls spinoso. Operculum multispiral. 



,, pagidula, Gould. Thoungycen R. Martaban. 



This is a fresh-water form, which was separated from the Melaniidce by Adams, 

 from the character of its operculum, which approximates to that of the Verilhiidce. 



