130 MOLLUSCA OE THE ' CHALLENaEB ' EXPEDTTIOIf. 



Gremis Stylieee. 



Sttlifee betchius, u. sp. ((^pv^ios, from the depths.) 



St. 325. March 2, 1876. Lat. 36° 44' S., long. 46° 16' W. 

 South Atlantic. 2650 fma. G-rey ooze. Bottom temperature 

 32°-7 F. 



Shell. — In form somewhat like Littorina rudis, Maton, of the 

 var. tenehrosa ; but shorter in base, with a tumid and larger 

 penultimate whorl, very thin, hyaline and glossy, with faint 

 spirals and lines of growth : the generic pillared tip is small. 

 Sculpture. Longitudinals — the whole surface is closely scored 

 with slight obsolete and very fine threadlets, which are the lines 

 of growth. Spirals — of these there are many, somewhat broadish 

 but very obsolete ; they are unequal, and one forms a feeble angu- 

 lation considerably above the middle of the whorl. Colour pure 

 glassy white, thin, and perfectly transparent. Apex : the style is 

 quite straight, well defined, short and small, and consists of two 

 whorls. Spire conical and rather high. Whorls 6, of rapid but 

 regular increase, obliquely shouldered above from the suture 

 to the very slight angulation, rounded below. Suture strong, 

 linearly impressed, submarginated below. Mouth roundly pear- 

 shaped, being shortly pointed above, large. Outer lip leaves 

 the body-whorl at a right angle ; it is slightly patulous, and is 

 well arched throughout. Inner lip very oblique, scarcely convex 

 above ; it is very concave at the junction of the body and the 

 pillar, which last is flattened and very slightly twisted and 

 runs out to a very sharp edge. H. 0"5. B. 0'39. Penultimate 

 whorl, height 0-14. Mouth, height 0-33, breadth 0"3. 



The solitary specimen got of this species is preserved in 

 spirit ; but I failed to extract the animal. The shell is so deli- 

 cate that no force can be used. The colour is that pale uniform 

 bufl" which is so common to deep-sea MoUusca. The mantle lines 

 the shell all round. Erom the middle of this projects a thickish 

 stalked mushroom-like foot, out of the centre of which extends a 

 long thin tongue-like process, somewhat like that figured by 

 Grould in the ' TJ. S. Exploring Expedition,' pi. xiv. fig. 247, but 

 shorter and not subulate. 



In regard to the shell, it is of course hardly necessary to say 

 that the apical " nucleus " is not " sinistral " (Ad. Gren. I. 239). 



