coxcHOLoar. 109 



*TURB0 EADIATUS, RcOVC. 



* ,, I'KTHOLATrS, L. 



* ,, poKPHTniTicu!*, Gmcl. 



* ,, conox.vns, (iincl. 



* ,, AKGYKOSrOlIA, L. 



Sub-f,imily ROTELLIN.E. 

 RoTKi.r.A, Lamarck. 



Shell hi^lily polished, hanilsoinely viiilegatcd, and with a large uinhilieal 'callus.' 

 Oj)erculuni thin, horny. 



* „ sp- 



A .species of this genus is found luiried in Ihc sands in cnunfless nuniliers along 

 the Arakan Coast. The advancing waves wash tlieni out, but they soon luiry tlum- 

 selvcs again when the water retreats. 



Order SCUTIBRANCHIATA. 



Gill consisting of two series of lanielhic over the neck or undcu' the edge of tiie 

 mantle. Sexes nnite(l (ITeruiaphrodite). The Sciitihranchidtd embrace a vast number 

 of species, luostl}' littoral in tiu'ir ludiits, and neslling among the s(^a weeds and rocks 

 along the shore. Tliey are vegetable feeders, and comjirise spiral sludls, as Xrri/ii 

 and Tiochus; patelliform shells as in I'atclla and Fissarclhi; and nuiltivalvc shells 

 like Chiton. 



Sub-onl(-r PODOrHTIIALMA. 

 Eyes pedunculate. Shell and operculum spiral. 



Faiiiili/ Neritidae. 



Nerita, Linno'ns:. 



Operculum horny, solid, with a shelly coat on each side, the outer surface 

 usually granular. 



* ,, roLiTA, L. Andamans. 

 *(Pila) cmtYsosTOMA, Ecovo. 



* ,, cosTATA, Chem. 



* ,, PLICATA, L. 



*fTnia,iosrYLA) Ai.iiifir.r.A, L. Andamans. 



* ,, BUKMAXICA, Phil. 



* ,, .SOrAMMfLATA, Lc Guillou. 



* ,, ATKoruiirrKKA, liccluz. 



* ,, GEyzAUUM, llecluz. 



Siih.fmmhj TllOCIIINiE. 

 Operculum horny, multispiral. 



*Bei,puint;la Pekonii, Kien. 

 *TKOcnus Nir.oTicus, L. 



* ,, OBELiscus, Lara. 



* ,, STELLATUS, Gmcl. 



* ,, INBISTINCTUS, Gray (non Phil.). 



* ,, Teanqdedauicus, Chem. 



,, ri-NCTATUs. Andamans. 



*P0LrD0NTA SQUAKllOSA, Lam. 



* ,, MACULATA, L. 



,, INCARNATA, Phil. Andamaus. 



*(lNFrNDIBUI,UJl) RADIATl'.M, DillwyU. 



Clancclls iiicKODoN, K. Adams. Andamans. 



