114 MITRA. 



M. C^ERULEA, Reeve. PL 33, fig. 18. 



Whitish, clouded with bluish gray, with a few chestnut spots 

 or strigations arranged in two revolving series, and below the 

 suture besides ; orange-brown within the aperture. 



Length, 1-5 inches. 



Viti Islands. Garrett. 



Highly colored as is this species, its form and sculpture are 

 so like M. variegata, that I doubt its distinctness. 



M. MAURITIANA, Sowb. PL 33, fig. 19. 



Cancellated by pitted grooves and longitudinal ridges ; white, 

 with two broad bands of interrupted brown spots. 



Length, 1-5 inches. Mauritius. 



M. INCISA, Ad. and Reeve. PL 33, figs. 20, 21. 



Whitish, variously clouded with purplish brown, sometimes 

 forming two broad bands, variegated sometimes with small 

 brown spots and whitish fine zigzag lines. Length, 22 mill. 



China, Andaman Islands. 



Sowerby considers M. Marise, A. Ad. (fig. 21), a synonym, 

 but Mr. E. A. Smith attempts to separate it on account of slight 

 differences of form. I am satisfied that they are identical, and 

 suspect that they are merely the young of a form of M. 

 variegata. 



M. SERPENTINA, Lam. PL 33, fig. 22. 



White, indistinctly stained and zoned with orange, longitudi- 

 nally painted with waved brown lines shadowed with white; 



aperture yellowish. Length, 1 '5-2*25 inches. 



Philippines, Polynesia. 



M. Deshayes remarks that M. variegata, GmeL, having priority 

 of publication, should be used in place of serpentina ; the latter 

 has, however, become so well established that Reeve has used 

 the former name for another recognized species, and under the 

 circumstances it is better not to be too strenuous for the main- 

 tenance of individual rights. 



M. MARQUESANA, A. Ad. PL 33, fig. 23. 



Color of M. serpentina, but finer sculpture, and much smaller 

 size. Length, 23 mill. 



Marquesas Islands. 

 Possibly not distinct from M. serpentina. 



