266 THE VOYAGE OF H.M.S. CHALLENGER. 



traceable, but still it is impressed, though very slightly so. Mouth long, narrow, a very 

 little curved, with parallel lips. Outer lip rises as high as the apex ; ascends slightly at 

 its insertion, where it has a feeble bluntly angular sinus ; in front it is obliquely truncate, 

 but not emarginate ; its forward edge is blunt and barely convex ; there is a strong broad 

 varix. Inner lip broadly thickened and spread out on the body, barely convex ; about 

 | of its length are occupied by the folds, of which the highest is horizontal, the lower 

 3 are slightly stronger, are very oblique, and are recognisable across the pad of enamel 

 which encircles the point of the base ; the foremost one is too feeble to form a reverted 

 flange round the tip of the pillar. H. 014 in. B. O'll. Mouth, height 0-14, breadth 0'02. 



This species slightly resembles Marginella angasi, Brazier, from Port Jackson ; but is stumpier, 

 with a smaller and more curved mouth, and 4 (not 1) pillar folds. 



5. Marginella (Glabella) agapeta} n. sp. (PI. XVI. fig. 9). 



Station 163b. June 3, 1874. Lat. 33° 51' 15" S., long. 151° 22' 15" E. Port 

 Jackson, Sydney. 35 fathoms. Hard ground. Bottom temperature 63°. 



Shell. — Gibbously oval, thin, translucent, lustrous, short-spired, small-mouthed, 

 toothed on the outer lip, and with three folds on the pillar. Sculpture: There are 

 slightly flexuous unequal lines of growth and excessively faint and minute microscopic 

 spirals. Colour : the spire, lip-edge, and front of the shell are porcellanous white ; but the 

 body-whorl has a translucent ruddy brownish tinge. Spire short and broadly conical. 

 Apex large, round, covered with a pad of enamel. Whorls 4, small. Suture buried in 

 enamel, but quite distinct. Mouth long, narrow, curved, a very little broader in front 

 than behind, with a rather deep, narrow, and angular sinus behind, and in front a 

 narrowish, small, rounded, and oblique canal, formed by the truncation of the shell. 

 Outer lip with no external callus, but thickened within and scored across there with small 

 close numerous and rather long teeth, which are absent in the canal in front and in the 

 bottom of the sinus behind ; the truncation in front which produces the canal is slight, 

 and almost perpendicular to the axis. Inner lip is almost straight, slightly thickened on 

 the body, and has in front three slight, blunt, subequal, close-set, oblique folds, of which 

 the foremost is continued as a reverted edge on the left of the canal. H. - 3 in. B. 0"17. 

 Mouth, height 0'24, greatest breadth 0*04. 



This species is not unlike the Marginella turbinata, Sow. ; but is less cylindrical, with a 

 slightly higher spire, a decidedly narrower mouth, a toothed and unvarixed outer lip, and 3, not 

 4, teeth on the pillar. It is not any of those given by Angas in his Australian lists. 



1 aycunirsc, beloved. 



