164 PLEUROTOMA. 



The dimensions are taken from P. Rombergi, Morch (fig. 8), 

 which is merely a larger example of P. picta. 



P. TIQRINA, Lamarck. PI. 2, fig. 10. 



Shell with sharply carinated whorls, the carina consisting of 

 a pair of narrow rihs ; 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. JICKELII, Weinkauff. PL 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. PL 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. L. 43, diam. 12-14 mill. 



Indian Ocean. 



Confounded by Reeve with P. variegata, Kiener. 



P. VARIEGATA, Kiener. PL 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 



