238 



Neritina helvola. Testa solida, conico-globosa, polita, co- 

 loribus fuscis et cervinis plerumque fulgurantibus diversimode 

 picta : spira prominula, erosa, anfr. 2 superstitibus : apertura 

 oblique semicircularis, helvola ; columella convexiuscula, callo 

 copioso induta, acute denticulata. Long. |, lat. f poll. Hah. 

 Feejee Islands. 



Closely allied to N. communis, but is rather more globular, and 

 generally smaller, and the aperture has a more nearly circular 

 outline. It has less brilliant and defined coloring, and is always 

 to be distinguished by its eroded tip, and the bright carnelian 

 color of its inferior face. 



Neritina siderea. Testa parva, ovata-globosa, polita, nitida, 

 nigra, punctis sparsis albis notata : spira prominula, erosa ; 

 anfr. 2-3 ; sutura marginata : apertura semicircularis, intus coe- 

 rulescens ; labio piano, angusto, luteo ; columella acuta, vix 

 denticulata. Operculum fuscum. Diam. ^ poll. Hah. Feejees. 



About the size of N. BoBtica, but more globose and solid ; the 

 inner lip less extended, and yellow instead of bluish, and it also 

 has the white specks by which alone it may be recognized. In 

 N. Bcetica the opercle is flesh-colored. 



Neritina amcena. Testa parva, ovato-triangularis, postice 

 constricta, striis incrementalibus ordinatis bene insculpta, colori- 

 bus nigris, rubris, flavidis plerumque fasciatim dispositis, et ma- 

 culis quadratis albis nigro-umbratis tessellatim dispositis, picta : 

 spira planulata, erosa, anfr. 2-3 ; apertura rotundato-elliptica, 

 flavo-viridis ; labro angusto, piano; columella valde arcuata, 10 

 denticulata. Operculum viridulum, inornatum. Axis -j?^, lat. | 

 poll. 



Nerita musiva. Testa modica, subsolida, transversa, ovoidea, 

 ventricosa, fusco-cinerea, longitudinaliter crasse striata, sulcis 

 volventibus ordinatis arata, liris interpositis planulatis, sub-gran- 

 ulosis, lineolis crebris albidis sectis : apertura sub-circularis, cali- 

 ciformis, peristomate sub-continuo : labro edentulo, albo, sulcis 

 obliquis fuscis tenuiter arato ; labio concavo, fusco, granulis 

 paucis notato, denticulis tribus instructo. Axis 4, lat. f poll. 



This unusually-shaped Nerite looks like a Stomatella, with the 

 whorls rounded in every direction, when viewed at the back. lis 



