50 GARRETT: ON POLYNESIAN MITRIDiE. 



It is very closely allied to the above two species. 

 ii8. Turricula laevicostata sp. nov. 



Shell small, elongate, fusiform, shining, white, more or 

 less stained with straw-yellow ; spire rather long, acute ', 

 whorls 8, planulate, last one narrow, convex, contracted and 

 recurved at the base; longitudinally costate, costge small, 

 smooth, rounded, interstices with transverse impressed striae; 

 aperture narrow, with very prominent lirae; outer lip rather 

 thick, and slightly sinuous above ; columella with five plaits. 

 J Length lo mill. (Mus. Godeffroy). 



*/ Hab. Pa^motu Islands. 



/ Two examples found on the sands at Anaa Island. 



119. Turricula microzonias Lamarck. Reeve, Conch. Icon., 

 pi. xxiv., fig. 185, pi. xxvi., fig. 202. 



Notwithstanding the wide range of this species, it is, 

 indeed, a very scarce shell. It occurs in all parts of Western 

 Polynesia, and in the Eastern groups we obtained it at the 

 Society and Panmotu Islands. 



The only two living examples found were taken from the 

 under side of stones on the shore reef at Kioa, Viti Island. 



Of Reeve's two poor figures the second one is the most 

 correct. Both Lamarck's and the above author's description 

 refer to faded examples. 



When perfect, the color is jet-black. The white zone, 

 which is constant, usually consists of a chain of small white 

 spots, but is sometimes expressed by a simple continuous 

 line. Some examples have a second line beneath the middle 

 zone. The aperture is bluish-white, margined with brown- 

 black. The columellar plicae are bluish-white on a more or 

 less dark brown ground. 



The ribs are sometimes nearly or quite obsolete on 

 the back of the body whorl. Mr. Reeve does not allude 

 to the peculiar plicately wrinkled base, which latter is 



