166 PLEUROTOMA. 



where encircled by narrow elevated ribs and striae which are 

 often granular or coarsely decussated by rugose growth-lines ; 

 white, clouded and spotted with light chestnut. 

 L. 66, diam. 23 mill. 



Indian Ocean, Japan. 

 P. UNDOSA, Lamarck. PL 3, fig. 21. 



Spire long ; convex ; carinated, narrowly ribbed throughout, 

 the ribs with intermediate raised lines ; canal short ; white, pro- 

 fusely maculated longitudinally with chestnut ; aperture purple. 



L. 64, diam. 20 mill. 



Indian Ocean, Philippines. 



The long spire, short canal, profuse maculations and purple 

 aperture are the principal features. 



P. GUERINII, Duval. Unidentified. Habitat unknown. 



P. LATERCDLATA, Sowerby. Unfigured. China Seas. 



P. ALBULA, Hutton. Unfigured. New Zealand. 



B. With short canal. 

 P. CINGULIFERA, Lamarck. PI. 3, fig. 23. 



Shell rather narrow, with very long spire, and short canal, 

 corded with larger and smaller riblets and raised lines, and very 

 slightly angulated on each whorl by a somewhat larger rib, which 

 is occasionally bipartite ; growth-striae sharp, sometimes decus- 

 sating the smaller spiral lines ; whitish, very closely and finely 

 peppered with chestnut, with chestnut spots on the shoulder-rib. 



L. 53, diam. 16 mill. 



Red Sea, Philippines, to Sandwich Islands. 



P. amicta, E. A. Smith, from the Sandwich Islands, differs 

 apparently only in the coloring ; it is unfigured. 



P. ERYTIIR^A, Jickeli. PL 3, fig. 24. 



Revolving riblets more regular, flatter, and proportional^ 

 larger than in the preceding species, chestnut punctations larger 

 and darker-colored, the line of spots on the second rib from the 

 suture being particularly conspicuous ; base of aperture violet- 

 tinted. L. 22, diam. 8 mill. 



Red Sea. 



Notwithstanding the above distinctive characters, I think this 

 will prove to be a synonym of P. cingulifera. 





