166 PLEUROTOMA. 
where encireled by narrow elevated ribs and striz 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. PI. 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. Guerinil, Duval. Unidentified. Habitat unknown. 
P. LATERCULATA, Sowerby. Unfigured. China Seas. 
P. atBuLA, 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 asomewhat larger rib, which 
is occasionally bipartite ; growth-striz 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. Erytur@a, Jickeli. Pl. 3, fig. 24. 
Revolving riblets more regular, flatter, and proportionally 
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. 
