MOLLTJSCA OF THE ' CHALLENGEB ' EXPEDITION. 123 



shaped, but not hollowed. Inner lip is a little thickened ; from 

 the upper corner of the mouth it runs straight to the point of 

 the pillar, on which it is broadly and. flatly reflected ; it is 

 abruptly angulated where it joins the basal lip. H. 0'15. B. 0'04. 

 Penultimate whorl, height 0-03. Tip 0-004. Mouth, height 0-06, 

 breadth 0-03, 



The, length of the base, the peculiar bend of the spire, and 



the narrow mouth cut off' on the left by the straight line of the 



"inner lip and narrower than the measurement seems to indicate, 



give a peculiar aspect to this shell. I know of none other 



which it re-embles. 



15. EULIMA FALL AX, n. Sp. 



July 29, 1874. Levuka, Fiji. 12 fms. 



Sliell. — Small, translucent, strong, rather broad, subangulated 

 at the periphery, with a short broad flattish base, a nearly sym- 

 metrical spire, a small subtruncated rounded one-sided apex, flat 

 whorls, a nearly invisible suture, an oblique pear-shaped mouth, 

 and a thickened lip. ^culfture. There are faint microscopic 

 lines of growth. Colour alabaster-white, glossy. Apex -. the first 

 two whorls are a little tumid and cylindrical, and the top is 

 somewhat abrujjt, being slightly tabulated with the small extreme 

 tij) but slightly projecting. Spire straight, with conical and 

 nearly symmetrical profiles. Whorls 9, flatly conical, small, and 

 of slow increase ; the last, which is also small, is slightly oblique, 

 and begins to contract almost from the suture ; the base is broad 

 and flattish to flatly rounded. Suture linear and hardly visible, 

 but toward the apex impressed ; it is scarcely at all oblique. 

 Mouth pear-shaped and oblique, extremely straight on the inner 

 lip. Older lip patulous, especially in front, thickened externally, 

 but bevelled off" from the outside to a fine edge, which retreats 

 very much above, but is roundly prominent at the periphery, 

 below which it does not retreat, or only ^ev^ slightly so toward 

 the front of the pillar, which is crossed obliquely by a Bissoina- 

 like trough. Inner lip : there is a narrow, patulous, thickish 

 glaze with a defined edge which runs in a very straight line from 

 the upper corner of the mouth to the point of the very short 

 pillar, where it joins the outer lip at a right angle. H. 0"13. 

 B. 005. Penultimate whorl, height 0-02. Tip of apex 0-004. 

 Mouth, height 0-049, breadth 0-04. 



This species seemed at first sight one already known ; but 



