AIDONE. 129 



M. TENUIS, Sowb. PL 37, fig. 117. 



Transparent, horny, with a light fulvous band on the upper 



part of the whorls. Length, '65 inch. 



Habitat unknown. 



" Much like M. typha, but more pyramidal." I suspect that 

 it is not distinct from that species. 



M. MICANS, Reeve. PL 37, fig. 120. 



Smooth, polished, ivory-white, faintly orange-banded. 

 Length, '7 inch. 



Cook's Islands, Polynesia. Garrett. 

 Perhaps this also is a form of M. typha. 



M. COOKII, Hanley. PL 37, fig. 121. 



Chestnut-brown, variegated with blue-gray ; delicately striated. 

 Length, 1-25 inches. 



Australia. 

 I do not know this species. 



M. ALBINA, A. Adams. PL 37, fig. 97. 



Spire and upper part of body-whorl folded longitudinally ; 



white. Length, !! inches. 



Island of Luzon, on the reefs. 

 Described from a single specimen in the Cumingian Collection. 



Section Aidone, H. and A. Adams. 



Shell fusiform, smooth, polished, small ; spire acuminate, as 

 long as the aperture ; inner lip excavated, with two prominent 

 plaits in the middle ; outer lip thin, simple. 



This little Olivella-like form may prove to be generically dis- 

 tinct from Mitra. 



M. ALBA, Pease. PL 51, fig. 471. 



White, polished, finely striated. Length, 7*5 milL 



Society and Paumotus Islands. 



Mr. Pease describes the columella as quadriplicate, but his 

 specimens now before me have only two distinct plicae, although 

 there are slight indications of additional ones, as might be 

 expected. 



M. INSIGNIS, A. Ad. 



An unfigured species, referred to Aidone j as its type. It 

 comes from Rains' Island. 

 17 



