286 AMERICAN JOURNAL 



laevigata, plana, latissima ; colore rufescente-succinea, interdum 

 nigro strigata, aut omnino nigra. 



Dimensions. — Diam. 5, alt. 3 mill. 



Locality. — Tahiti. 



Shell ovate, roundly convex, rather thin, roughened by lines 

 of growth ; spire depressed ; columella area of an ash color, 

 smooth, plane, very wide; reddish-amber color, sometimes 

 streaked with black or wholly black. 



Closely allied to N. succinea, inhabiting the West Indies. It 

 is shorter and more convex than that species, and the columella 

 area broader. 



Nerita maculata. Pease. Plate 24, fig. 6. 



Description. — T. globosa, rotundata, solida, crassa, spiraliter 

 tenuiter et creberrime, lineari sulcata ; spira plano-depressa ; 

 area columellari vix concava, granulata et corrugata, fortiter 

 dentata ; labro intus valde crenato et dentato ; nigra, punctis 

 luteis lentiginosa. 



Locality. — Tahiti. 



Shell globose, rounded, solid, thick, spirally finely linearly 

 grooved throughout ; spire flatly depressed ; columella area 

 slightly concave, granulated and wrinkled, strongly toothed, 

 teeth three, of which the upper is very broad ; lip strongly cre- 

 nated and toothed ; black, speckled with yellowish dots. 



It is surprising this species should not have been noticed be- 

 fore. It approaches JV. argus, Reel., but is more round and 

 compact, also regularly grooved throughout. 



Trochus exilis. Pease. Plate 24, fig. 7. 



Description. — T. imperforata, elato-conica ; anfr. plano-con- 

 cavis, ad marginem granoso-costatis, utrinque tenuiter transver- 

 sim striata ; basi convexa, lirata et striata ; apertura ad basim 

 vix effusa ; alba, castanea transversiin lineata et longitudinaliter 

 strigata, basi castaneo-punctata. 



Dimensions. — Alt. 7|, diam. 5 mill. 



Locality. — Paumotus. 



Shell imperforate, elevately conical ; whorls flatly concave, 

 encircled at their lower margin with a granose rib, transversely 

 minutely striate throughout ; base convex, ridged and striated ; 

 aperture slightly eff"use at base of columella ; white, finely line- 

 ated transversely and striped longitudinally with chestnut-brown, 

 base dotted with brown. 



