MOLLUSCA or THE ' CHALLENGER ' EXPEDITIOK. 113 



being perfectly rounded and slightly set to one side. Whorls 

 10, of very regular and slow increase ; quite flat. Suture oblique, 

 not in the least impressed, so that the division of the whorls is only 

 traceable from the division- walls shining through the shell. 

 MoiitJi long, narrow, and pointedly oval. Outer lip rises a very 

 little on the body-whorl, and here at the upper corner of the 

 mouth it is slightly hollowed backw^ard ou the edge, while it ad- 

 vances in front to tlie periphery : its direction is very straight 

 in the line of the spire's slope ; on the base, v^^hich is narrow, it is 

 extremely patulous. Inner lip : a very thin and undefined glaze 

 expands on the body, which is very faintly convex, and melts 

 without a break into the pillar, which is very slightly thick- 

 ened, rounded, and twisted, and behind which lies the slightest 

 possible furrow. H. 0'17. B. 0'04. Penultimate whorl, height 

 0-027. Tip of apex, breadth 0-005. Mouth, height 0-058, breadth 

 0024. 



This species, in the perfect flatness of its whorls, the absence 

 of any impression of the suture, and form of the apex, greatly 

 resembles JS. siibulata, Don. ; but it is much more attenuated, the 

 body-whorl in particular is more contracted at the periphery, and 

 the apex is smaller and more perfectly rounded and very slightly 

 bent to one side. In E. hilineata, Alder, the base of which is 

 liker the ' Challenger ' species, the whorls are slightly rounded. 

 In E. distorta, Desh., var. gracilis, there is always some slight 

 irregularity in the spire, and the apex is very much more 

 minute. 



2. EULIMA FASCIATA, D. sp. 



St. 24. (As above.) 



Shell.^-Yerj small, slightly bent, short ; the suture is discerni- 

 ble on the surface and faintly banded above with white, the base 

 is rounded, the mouth pointedly oval, the tip small and rounded. 

 Sctdptttre none. Colour translucent, with an ivory band encircling 

 the body-whorl at the periphery, and lying above the suture on the 

 spire. Apes small, perfectly rounded. Spire rather attenuated 

 and bent. Whorls 9, flat, the last rather long with a produced 

 rounded base. Suture oblique, slightly impressed, especially 

 near the apex. Mouth rather large, oval, pointed above. Outer 

 lip a little prominently arched ; on its front edge it is rather 

 deeply sinuated above, prominent in the middle, and retreating 

 at the base so as to form a broad, shallow, little canal in front. 

 Inner lip : a very narrow rather thin glaze with a defined edge 



