3o8 JOURNAI. OF CONCHOI.OGY, VOL. I4, NO. lO, APRIL, I915. 



It is most nearly related to T. aequa (Smith), and T.perfecta (Smith), 

 but is at once known by its three keels on the body-whorl, whereas 

 T. aequa has seven, and T. perfecta five. 



Leiostraca 'diauges sp. nov. (pi. 5, f. 6). 



Shell subulate, straight, smooth, poUshed, imperforate, trans- 

 parent, the axis being plainly visible through the shell ; colour white 

 with somewhat irregular and interrupted l^rownish yellow banding, 

 which starts immediately below the apex ; whorls nine to ten, flat 

 with inconspicuous suture ; protoconch smooth and yellowish ; on 

 the last three, sometimes the last four whorls there are two irregular, 

 much interrupted, often slightly oblique bands of a brownish yellow 

 colour, with some irregular marks of the same colour towards the 

 base of the body whorl ; on the upper whorls there is a single, 

 more continuous band, which on the first three or four whorls is 

 practically sutural ; aperture narrow, short, pyriform, extremely acute 

 above ; columella slightly arcuate. 



Long. : 4 mm. ; diam. max. i"4 mm. 



Hab. : S. Thome, rare. 



Syrnola thomensis sp. nov. (pi. 5, f 2). 



Shell elongate, fusiform, smooth, polished, shining, imperforate, 

 white, somewhat opaque ; whorls eleven to twelve, with smooth, 

 heterostrophe apex, the diameter of the last whorl being rather 

 less than that of the penultimate \ suture strongly incised, showing 

 this feature very clearly in the outline of the shell ; aperture 

 elongate oval, rather small, one-tenth of the total length of the shell ; 

 columella with a strong plait. 



Long. : 1 1 mm. ; diam max. i 5 mm. 



Hab. : S. Thome, scarce, in coral gravel. 



This species is very similar in general appearance and proportions 

 to Syrnola aciculina (Souv.) from New Caledonia and Lifu (as S.jaculum 

 Melv. and St.), but it increases rather more abruptly in breadth and 

 has its greatest diameter at the penultimate, instead of at the last 

 whorl. The aperture is much smaller than in aciculina. 



From Syrnola gracillima Smith (Whydah) it differs in its more 

 swollen appearance with tapering apical whorls ; the \^^hydah species 

 is almost straight-sided. 



Odostomia ^pithus sp. nov. (pi. 5, f. 4). 

 Shell ovate, pupiform, smooth, semitransparent, white, rather 

 dull, imperforate ; whorls seven to eight, very slightly convex, taper- 



1 OtavyrJS = t''a-'isparent. 



2 TTtvOS^^:^ wine-jar. 



