STRKJATELLA. 153 



S'ftiiin Siriga ella, S^iiinson. 



Tliis iJ^roup is veiy genei-ally recognized us a distinct genus, 

 l)ut it will be better to regard it simply as a section of Mitra ; 

 indeed no sharp line separates it from many of the species 

 ranged under the preceding section ; the principal distinctive 

 characters being a more decidedly columbelliform appearance, a 

 smooth surface, single color or with brown longitudinal flames 

 and maculations. Of the two subgenera heretofore assigned 

 here, the first, Mitt-eola, contains those species which connect 

 the typical form with the last section of Mitra; the second, 

 Zierliana^ includes a number of species having a peculiar 

 character of the aperture, and readily distinguishable from the 

 other groups. Moreover the species of Strigatella^ so-called, 

 which possess the dentition diftering so widely from Mitra^ 

 belong to this group Zierliana, which may therefore well be 

 separated as a subgenus. Of the group Slrigatella as thus 

 restricted, the dentition remains unknown. 



M, ACUMINATA, SwaiusoH. PI. 45, fig. 312. 



Yellowish, sometimes w^th a lighter band in the middle, 

 frequently invested with a slight epidermis. Length, 1 inch. 



Philippines ; Polynesia. 



M. COARCTATA, Swainson. PL 45, fig. 313. 



Yellowish, longitudinally clouded with chestnut. 



Length, '9 inch. 



Isle of Annaa. 



Only distinguishable by its painting from M. acuminata. It 

 is very likel}^ a variety. 



M. BRUNNEA, Pease. PI. 45, fig. 301. 

 Yellowish brown, spire rather obtuse. 

 Length, -TS-l'lO inches. 



Polynesia. 

 The animal is milk-white. 



M. NIGRICANS, Pease. 



An vmfigured species, blackis^ with a light band, and lead- 

 colored aperture. Length, 20 mill. 



Polynesia. 

 This species has not been identified by Mr. Garrett. 

 20 



