49 



About the size of N. B&t.ica, 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. Boetica 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 T 3 ^, lat. 

 I poll. 



This might be regarded as the young of N. polita. It is stri- 

 ated like it, but it differs in the color of its aperture, and in its 

 opercle ; and the shadowed white spots are constant and peculiar. 



Nerita mdsiva. 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 J-, lat. -| poll. 



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

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

 general form is somewhat like N. signata. It is remarkable for 

 its nearly circular, cup-shaped aperture, its shining black, finely 

 granulated concave pillar, and its gray, minutely mosaic surface 

 produced by the white lines crossing. its ridges. 



Natica Lewisii. Testa prasgrandis, solidiuscula, conico-globo- 

 sa,albida, epidermidesordidestramineoinduta,lineis minimis, con- 

 fertissimis, flexuosis cincta ; spira anfr. 6 ventricosis postice valde 

 constrictis : apertura obovata, ampla ; callo copioso albo castaneo- 

 tincto supra umbilicum modicum simplicem profundum circum- 

 ambiente, ad anfractum ultimum munita ; fauce incarnata.. 

 Operculum corneum. Axis 4J-5, lat. 4 poll. Hab. Puget Sound. 



This certainly exceeds in size all other species yet discovered. 

 It is allied to N. heros, some specimens* of which occasionally 

 approach it in size. It is however less*globular, and distinguish- 

 7 



