STRTGATELLA. 153 



Section Siriga'ella, Swainson. 



This group is very generally recognized as a distinct genus, 

 but 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, Mitreola, 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 differing so widely from Mitra, 

 belong to this group Zier liana, which may therefore well be 

 separated as a subgenus. Of the group Strigatella as thus 

 restricted, the dentition remains unknown. 



M. ACUMINATA, Swainson. PL 45, fig. 312. 



Yellowish, sometimes with 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. 



Me of Annaa. 



Only 'distinguishable by its painting from M. acuminata. It 

 is very likely a variety . 



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



Yellowish brown, spire rather obtuse. * 



Length, -75-1-10 inches. 



Polynesia. 

 The animal is milk-white. 



M. NIGRICANS, Pease. 



An unfigured species, blackish with a light band, and lead- 

 colored aperture. Length, 20 mill. 



Polynesia. 



This species has not been identified by Mr. Garrett. 

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