OF CONCHOLOGY. 69 



Mr. Hinds observed .that no species of Pleurotoma proper 

 inhabit Polynesia. Such we believe to be the case as regards 

 Southern and Western Polynesia. The above two are the only 

 ones known to me as inhabiting the Hawaiian Islands. Speci- 

 mens have been laying in my collection for several years past, 

 dead and broken, awaiting the discovei^y of perfect ones, which 

 are very rarely met with. 



MiTRA Newcombii, Pease. 



T. elongata, subcylindraceo-fusiformi ; spira brevis, acuta ; 

 anfr. plano-convexis, transversim punctato-striatis, interdum 

 striis in medio anfr. ultimo evanidis ; anfr. ultimo superne, spi- 

 raque striis impressis decussatis ; basi remote sulcata, vix trun- 

 cata ; columella quinqueplicata ; alba, remote rufescente fusca 

 punctulata ; anfr. ultimo fascia lata fusca cingulata. 



Long. 27. Diam. 8 mill. 



Hah. Insl. Oahu. 



Shell elongate, rather cylindrically fusiform ; spire short, 

 acute ; whorls flatly convex, transversely punctate striate, striae 

 becoming sometimes obsolete on middle of last whorl ; spire and 

 upper part of last whorl decussated by longitudinal impressed 

 stride ; base distantly grooved and somewhat truncate ; columella 

 five plaited. White, remotely punctured with reddish brown dots, 

 last whorl encircled with a broad dark brown band. 



Had not Mr. Reeve decided M. bicolor, Swain., to be the 

 young of M. casta, I should have connected the above species 

 with it as a variety. I am of opinion that the shell figured by 

 M. Kiener, pi. 32, is the above species, especially fig. 106a, 

 though of much smaller size. I have specimens of M. casta 

 from both Eastern and Western Polynesia. Those from the 

 west vary in the transverse strise extending over the upper part 

 of the last whorl. It cannot, however, be confounded with the 

 above species, which resembles in shape M. filu7n, Reeve, to 

 which it is also allied in other respects. 



Alcyna lineata. Pease. 



T. subelevato-turbinata, crassa, anguste perforata, tVansver- 

 sim lirata ; anfr. 4, convexis ; apertura ovata ; labro intus 

 incrassato ; liris rubris, interstitiis albidis, apice columellaque 

 albis. 



Alt. 21. Diam. li mill. 

 Hah. Insl. Oahu. 



Shell somewhat elevately turbinate, solid, thick, narrowly 

 perforate, transversely ridged; whorls 4, convex; aperture 



