EEPOET ON THE GASTEEOPODA. 601 



reversed. Colour white, translucent, slightly glossy. Spire high narrow and conical. 

 Apex blunt, tabulated, the tip, which consists of one minute whorl and a half, being 

 flattened down and immersed, while still encircled with an impressed suture ; the first 3 or 

 3^ whorls are smooth and glossy, and the normal sculpture seems to begin imperceptibly 

 and increase regularly. Whorls 7 in all, of regular increase, flatly convex; the last is 

 long, with a full prolonged base. Suture oblique, slightly impressed, with the faintest 

 possible constriction round the very top of each whorl. Mouth obovate, or slightly pear- 

 shaped, being a little pointed at the top, broadened below. Outer lip apparently 

 thickened and expanded, but it has been recently broken, and the restoration is still thin, 

 direct and level on the edge, with a very flat curve till the base is reached, where the 

 curve is rapid, and the edge is expanded and thickened. Inner lip concave through- 

 out ; on the body spread out with a defined edge, and somewhat thickened ; on the pillar, 

 which is long, the edge is patulous, blunt, and scarcely prominent ; there is a slight 

 angulation and thickening in front, at the junction with the outer lip. H. 0*152 in. 

 B. 0-065. Mouth, height 0-061, breadth 0'042. 



This remarkable species recalls Odostomia of the group Parthenia, but the apex quite separates 

 it from that genus. 



D. Spiralled weakly (Ceratia), i.e., in which there are spiral threads, but these not strong. 



27. Rissoa (Ceratia) glaphyra? n. sp. (PI. XLV. fig. 6). 



Station 135c. October 17, 1873. Lat. 37° 25' 30" S., long. 12° 28' 30" W. Off 

 Nightingale Island, Tristan da Cunha. 100 to 150 fathoms. 



Shell.— Thin, ovate, conical, hyaline, white, with a blunt rounded tip, convex striated 

 whorls (the body- whorl being slightly tumid), a slightly impressed suture, a rounded base, 

 an unvarixed Up, and a subangulately ovate mouth. Sculpture: Longitudinals — on the 

 upper part of the body-whorl, and perhaps of the others, there are very feeble, narrow, 

 flat, sparse riblets. Spirals — the whorls are faintly scored with very slight flat ridges and 

 shallow furrows, but both longitudinals and spirals are so slight that their intersection is 

 scarcely appreciable. Colour hyaline, white, and glossy. Spire not narrow, conical. 

 Apex very blunt, the extreme tip being immersed. Whorls 5, convexly conical on the 

 sides, of regular increase, the last a little tumid. Suture slightly impressed, little oblique. 

 Mouth subangulately ovate, being bluntly pointed above, angulated both at the top and 

 at the point of the pillar. Outer lip thin and sharp, above, its curve is very flat ; it 

 is slightly patulous on the base. Inner lip extremely thin on the body, straight, with a 



1 y\a.f\iUi, neat. 

 (ZOOL. CHALL. EXP. — PAET XLII. — 1885.) Tt 76 



