OP CONCHOLOGY. 271 



DESCRIPTIONS OF SIXTY-FIVE NEW SPECIES OF MA- 

 RINE GASTEROPODiE, INHABITING POLYNESIA. 



BY W. HARPER PEASE. 



Cylindra FORMOSA, Pease. Plate 23, fig. 1. 



Description. — T. cylindraceo-oblonga, olivjieformi, laevigata, 

 polita, transversim regulariter punctato-striata ; spira brevi, 

 acuta ; columella quadriplicata ; pallide rosacea, longitudinaliter 

 alba strigata aut maculata, apertura lutea. 



Dimensions. — Long. 14, diam. 6 mill. 



Locality. — Ascension. 



Shell cylindrically oblong, olive-sbaped, smooth, polished 

 transversely regularly striated, stride punctured, rather distant ; 

 columella four plaited ; light flesh color, spotted or striped long- 

 itudinally with white, aperture yellowish. 



Allied to 31. filum, Wood. 



MiTRA SECTILIS, Pease. 



Descriptio7i. — T. fusiformi, transversim lirata, liris parvis, 

 planulatis, augustis, striis longitudinalibus rugulosis, interstitiis 

 punctatis, basi truncata ; spira acuta, acuminata; columella 

 quadriplicata, alba, maculis quadratis luteis picta. 



Dimensions. — Long. 24, diam. 8 mill. 



Locality. — Insl. Hawaii. 



Shell fusiform, transversely ridged, ridges flat, close-set and 

 small, somewhat roughened by longitudinal striae, interstices 

 punctured ; base truncate ; spire sharply acuminate ; columella 

 four-plaited ; white, checkered with square yellow spots. 



The above may be immature. The spots were originally of a 

 brownish color possibly. I believe it to be extinct, at least on 

 the Sandwich Islands. 



