348 Transactions. 



a narrow ridge over the pillar down to the base, and uniting 

 with the basal lip ; there is no callosity upon the parietal wall. 

 Operculum unknown. 



Diameter, 1*6 mm. ; height, 6 mm. 



Type in my collection. 



Several specimens were obtained. 



20. Odostomia (Evalea) chordata, n. sp. Plate XXVII, fig. 5. 



Shell small, elongate - ovate, subperforate, slightly scalar, 

 rather thin, polished. Sculpture consisting of very fine and 

 close microscopic spiral stria?, and in addition a few subequi- 

 distant flat spiral cords, distinct only on the body- whorl ; their 

 number is about 9 ; those on the middle of the whorl are less 

 conspicuous ; the growth-lines are vertical, close, and fine, but 

 some are more prominent. Colour white. Spire elevated- 

 conic, about 1J times the height of the aperture ; outlines 

 straight. Protoconch small, heterostrophe, of 1 upright whorl, 

 smooth and shining. Whorls 6, regularly increasing, flatly 

 convex, somewhat contracted below at the suture, and slightly 

 projecting above out from the suture ; base flat. Suture 

 deep, narrowly margined below. Aperture oblique, pyriform. 

 slightly and broadly effuse below. Outer lip thin and sharp. 

 Columella vertical, strongly arcuate, with a moderate plait 

 above, situate rather deep within the aperture ; inner lip very 

 narrow, spreading as a very thin callous layer over the parietal 

 wall. Umbilical fissure narrow. 



Diameter, 1*9 mm. ; height, 3'8 mm. 



Type in my collection. 



One specimen only. 



21. Odostomia (s. str.) incidata, n. sp. Plate XXVII, fig. 6. 



Shell small, subulate, narrowly subperforate, with a fine 

 groove on the periphery of the body- whorl, fairly solid, polished. 

 Sculpture consisting of excessively fine dense microscopic spiral 

 lines ; on the third whorl a very fine groove appears above 

 and close to the suture, a little more distant and better tiuirked 

 on the next volution, and continued on the periphery of the last 

 whorl ; growth-lines vertical, fine, but distinct. Colour white. 

 Spire elevated-conical, about 2i times the height of the aper- 

 ture ; outlines almost straight. Protoconch small, heterostrophe, 

 tilted at a right angle to the axis, of 1 convex whorl, smooth 

 and shining. Whorls G, regularly increasing, slightly shouldered 

 and convex ; base rounded. Suture channelled, lightly margined 

 below. Aperture oblique, oval, angled above, effuse below. 

 Outer lip moderately convex, thin, and sharp. Columella 



