PILEOPSIS. 11 



F. pusTULA. Roundish elliptic^ flattish, and 

 truncated in front^ dirty vvhite^ with decussated 

 striae ; longitudinal striae rather prominent ; per- 

 foration not central^ lengthened^ enlarged in the 

 middle, and girded with a pink line ; small. W. 

 38. 90. 



F. FASCicuLARis. Small, oblong - elliptic, 

 flattish, sallow, and rayed with pinkish-brown 

 fasciculated lines ; striae crowded ; perforation as 

 last ; internal border apparently entire ; nests 

 only on its sides. 



F. MiNUTA. Minute, oblong-elliptic, convex, 

 white, decussated with slender striae, of which 

 the longitudinal are sub-granular, rayed with thin 

 black lines ; perforations small, not central. 



PILEOPSIS. 



Univalve ; obliquely conic ; anteriorly recurved ; 

 summit hooked, sub-spiral ; aperture elliptically 

 round ; anterior margin shortest, the posterior 

 one large and rounded; the muscular impres- 



