ZIERLIANA. 157 



M, TiGRiNA, A. Ad. PI. 46, ngs. 348, 347. 



Glaudiniform, with revolving striae ; lon<iitu(linally finely 

 strigate with chocolate and yellowish or whitish, aperture 



chocolate. Length, 1'8 inches. 



Mauritius. 

 A giant edition of M. retusa^ but proportionall}' narrower 

 than that species. M. jucunda, Tapparone-Canefri (fig. 347), is 

 identical with it. 



M. Anais, Lesson. 



An unfignred species from the Gambler Islands. It evidently 

 belongs to the present group. 



M. ruscESCENS, Pease. (Unfigured.) Sandivich Islands. 



Subgenus Zierliana, Gray. 



In the introductory- remarks upon the Strigatella section of 

 Mitra (p. 153), I have stated the reasons which induce me to 

 merge that group in the Mitras and to separate from it Zie?'- 

 liana, which H. and A. Adams and their successors have con- 

 sidered as a subgenus of Strigatella. 



M. ZiERVOGELiANA, Gmelin. PI. 46, figs. 345, 346, 349, 350. 



Dark chocolate-brown, aperture and columella white or slightly 

 tinged with light chocolate. Length, -Q-ri inches. 



Philippines, Polynesia. 



Sometimes the ribs are denuded of epidermis, and give a 

 zebra-like coloration to the species. 



Yar. ROBUSTA, Reeve, Fig. 346. 



Not so coarsely sculptured, with less shoulder and somewhat 

 higher spire. This is the ordinary Polj-nesian form. It is 

 littoral, under lava stones on rocky coasts. 



Var. WoLDEMARii, Kiener. Fig. 349. 



Still more finely sculptured and with higher spire than var. 

 rohusta; with which it insensibly connects. 



Var. SOLIDULA, Reeve. Fig. 350. 



Sculpture fine, lightly impressed, more or less obsolete in the 

 middle portion of the body-whorl. The young shell which 



