Zoological Society. 147 



Melania cochlea. M. testa subspinosd, turritd, costatd, striatd, 

 tenui,fulvd, maculis badiis ; spird scalariformi, ovato-acuminatd, 

 apice acutd ; suturd lineari ; anfractibus decern, inferne subcon- 

 vexis, superne angulatis et concavis ; costis obliquis, longitudina- 

 libus, anfractuum in angulo elevatis et acute mucronatis, supern^. 

 vix obsoletis ; striis transversis, minutis, aliquando obsoletis ; an- 

 fractu ultimo parvo, ad basim striate; aperturd ovatd, supern^ 

 acutd, inferne effusd. 



Hah. ? 



Length 1, diam. '4 of an inch. 



Remark. — On the last whorl of the only specimen[|submitted, the 

 costse are almost obsolete. The striae are strongest near the sutures, 

 and scarcely visible at the middle of the whorls. 



Melania lateritia. M. testd cancellatd, acute ovatd, compressd, 

 crassiusculd , striatd, graniferd, albidd, virido-fuscd, rufo fasciatd 

 aut atrd ; spird elevatd, plerumque scalariformi, apice acutd aut 

 erosd; suturd impressd, crenatd ; anfractibus decern, planatis, 

 superne angulatis, supra unguium sccpe albidis ; striis transversis 

 crebris graniferis ; granulis quadratis, abruptis, planatis^ serie- 

 bus longitudinalibus positis ; anfractu ultimo magno, subcom- 

 presso ; basi graniferd ,- aperturd ovatd, superne acute angulatd 

 et sinuatd, inferne laid, expansd et retusd, interne scepe fasciatd ; 

 columelld contortd; operculo parvo, ovato. 

 Hah. Philippines. 

 Length 1'6, diam. •/ of an inch. 



Var. a. Anfractibus superne graniferis, infern^ striis transversis 

 impressis ; basi vix Icevi, striis raris. 

 Var. /3. Striis graniferis alter nantibus. 



Remarks. — A very variable species as to size, colour and sculp- 

 ture. The operculum differs much in some individuals in both its 

 shape and apex. This shell bears some resemblance to the M. gra- 

 nifera^ Lam. Its most remarkable characteristic is its square, flat- 

 tened granules, bearing some resemblance to brickwork. 



Melania modicella. M. testd Icevi, ovato-conicd, crassd, nitidd, 

 virido-fuscd ; spird conicd, brevi, apice acutd, scepe erosd ; suturd 

 lineari ; anfractibus quinque, convexis, rapide crescentibus , prope 

 suturam superiorem depressis, prope suturam inferiorem striis 

 parvis transversis duabus aut tribus ; anfractu ultimo magno, 

 medio striis tribus, basi Icevi; aperturd ovato-rotundd, superne 

 subangulatd, inferne subeffusd, intus albidd; labro acuto ; colu- 

 melld lacted, curvatd ; operculo ovato, subcentrali, concentrico. 

 Hah. Timor. 



Length "7, diam. '5 of an inch. 



Remarks. — This shell and the M. zeylanica may perhaps be taken 

 as the types of a new genus or subgenus. Further investigation with 

 respect to the animal may decide ; in the meantime, the name of 

 RivuLiNA is proposed provisionally. The general outline and oper- 

 culum are those of the Paludina. Li old specimens the peritreme of 

 the mouth is continuous, but there is onlv a slight depression behind 



10* 



