164 PLEUROTOMA. 
The dimensions are taken from P. Rombergi, Morch (fig. 8), 
which is merely a larger example of P. picta. 
P. TigRInA, Lamarck. PI. 2, fig. 10. 
Shell with sharply carinated whorls, the carina consisting of 
a pair of narrow ribs; whole surface with close, raised revolving 
lines, of which two or three below the carina are more prominent ; 
whitish, minutely numerously brown-spotted, with usually a row 
of larger spots below the suture. L. 65, diam. 20 mill. 
Philippines (Cuming), Viti Islands (Garrett). 
P. JickELI, Weinkauff. PI. 2, fig. 11. 
Shell less carinated, with more rounded revolving ribs than 
the preceding species, with large spots at the sutures and smaller 
ones elsewhere, coalescing into longitudinal streaks. 
L. 53, diam. 13 mill. 
Red Sea. 
A species having no strongly marked characters, and perhaps 
only a variety of P. Garnonsii, between which and P. tigrina it 
appears to form a connecting link in its general appearance— 
although there are minor points of difference from both of them. 
P. pictuRATA, Weinkauff. PI. 2, fig. 12. 
Shell bluntly carinated by a pair of approximated revolving 
ribs, with numerous smaller but unequal ribs; white, with chestnut 
spots, sometimes coalescing into longitudinal stripes, and a row 
of larger spots at the suture; the canal is much shorter than in 
any of the preceding species. lL. 43, diam. 12-14 mill. 
Indian Ocean. 
Confounded by Reeve with P. variegata, Kiener. 
P. VARIEGATA, Kiener. PI. 2, fig. 13. 
Shell scarcely carinated by a single revolving rib, above and 
below which are two revolving threads, and then covering the 
balance of the body-whorl, alternate small ribs and threads, the 
former spotted with chestnut-brown; canal rather wide, and of 
- moderate length. L. 82, diam. 22 mill. 
Indian Ocean, Philippines, Japan. 
Not so sharply keeled, with shorter, wider canal, and wanting 
the duplicated keel-rib of P. tigrina; the want of duplication in 
