216 AMERICAN JOURNAL 



transversim striata, striis minutissimis decussata ; labro in medio 

 incrassato ; columella quadriplicata ; alba. 



Dimensions. — Long. 7 J, diam. 2 mill. 



Habitat. — Paumotus. 



Shell elongate, slender, fusiform, rather thin, striated trans- 

 versely, decussated with very fine longitudinal stride ; aperture 

 slightly effuse at base, somewhat contracted and thickened in 

 the middle ; columella four-plaited ; color none, white. 



Thala angiostoma, Pease. — Plate 15, fig. 0. 



Description. — T. elongata, attenuata ; anfr. plano-convexis, 

 granulatis ; labro dentato ; apertura angusta, columella quinque- 

 plicata ; canali elongate, recurve ; alba. 



Dimensions. — Long. 12, diam. 3| mill. 



Habitat. — Paumotus. 



Shell elongate, slenderly fusiform, attenuated at both ends, 

 whole surface evenly granulated ; whorls flatly convex ; outer 

 lip dentate its whole length ; columella five-plaited ; aperture 

 very narrow; canal long and recurved; wholly white. 



Remarks. — The sculpture of this species resembles T. recurva, 

 Rve. ; its shape is similar to that of T. mirifica, Rve. 



Thala saltata, Pease. Proc. Zool. Soc. London, 1865. 



Description. — T. fusiform!, subulata, elongata, tenui, nitida, 

 pellucida, cornea ; basi subtruncata, transversim striata, longi- 

 tudinaliter subtillissime striata ; anfr. planis seu subconvexi^, 

 marginatis ; columella tri seu quadriplicata, plicis obliquis ; 

 apertura ampliore, dimidium longitudinis testae sequante ; labro 

 tenui. 



Dimensions. — Long. 7, diam. 2 mill. 



Shell fusiform, elongate, subulate, rather thin, shining, pellu- 

 cid, corneous ; base subtruncate, transversely striate, longitudi- 

 nally very finely striated ; whorls plane or flatly convex, 

 marginated ; columella three or four-plaited, plaits oblique ; 

 aperture rather open, about one-half the length of the shell ; lip 

 thin. 



Remarhs. — To the above three species should be added 

 Pleurotoma todilla, Migh., Proc. Bost. Soc, 1845 ; and we are 

 of opinion that Thala should be raised to the rank of a genus. 



