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



tooth on the pillar is very feeble. 1 My note on the British Museum Buccinuli was that some of 

 them seemed not well individualised, especially in the case of the various specimens of Actceon glaber 

 (Reeve), Actceon affinis (A. Adams), and Actceon fumatus (Reeve), and, further, that Actceon cinereus, 

 Wats., seemed to agree with two specimens of Actceon glaber on different tablets, the one from Fiji, 

 the other from " Sandy Cape." Mr Edgar A. Smith, who kindly compared the species for me, confirms 

 this opinion. Writing on May 2, 1882, he says, "We have this shell marked Actceon glaber, var., 

 from Japan ; but it is probably distinct from that species." 



12. Actceon (Actceonina) edentulus, Watson (PI. XLVII. fig. 6). 



Actceon edentulus, Watson, Prelim. Report, pt. 18, Journ. Linn. Soc. Lond., voL xvii. p. 284. 



Station 149c. January 19, 1874. Lat. 49° 32' S., long. 70° E. Balfour Bay, Royal 

 Sound, Kerguelen. 60 fathoms. Volcanic mud. 



Shell. — Fragile, ovate, white, with a thin chestnut-coloured epidermis, a bluntish scalar 

 spire, a largish mouth, inner lip untoothed. Sculpture : Longitudinals — there are very 

 many close-set minute lines of growth, with here and there one much stronger than the rest 

 which cuts in like a fault on the spirals, interrupting their continuity. Spirals — there are 

 many regular, but not sharp-cut nor stippled furrows which corrugate even the interior 

 surface of the shell : about 70 of these are on the body-, about 20 on the penultimate 

 whorl. They are strongest toward the middle of the body-whorl, and somewhat faint 

 toward the upper suture ; the flat surface between them, which is about thrice their breadth, 

 is more or less distinctly scored by a very faint furrow. Colour opaque white, covered 

 with a thin glossy chestnut-coloured epidermis, which is a little darker below the suture 

 and on the base. Spire rather high, roundedly and bluntly conical, scalar. Apex slightly 

 eroded, but evidently blunt, large, and slightly inverted. Whorls 5£, somewhat convex, 

 of rather rapid but regular increase ; the last is long and cylindrical, with a rounded pro- 

 duced base. Suture oblique, strong ; axially impressed rather than channelled. Mouth 

 long, transversely pear-shaped, narrowing very gradually above, open and rounded below. 

 Outer lip a little patulous above, a good deal so on the base : it rises from the body-whorl 

 at a right angle, but immediately bends downwards and runs forward to the base quite 

 straight and parallel to the axis ; across the base it is slightly emarginate. Inner lip : a 

 thin narrow glaze crosses the body and borders the pillar, which is narrow and concave, 

 with a rounded, slightly twisted, and feebly marginated edge. There is no tooth. H. 1 

 in. B. 0-5. Penultimate whorl, height 0*2. Mouth, height 0*65, breadth 0*31. 



This fine species is represented by only one somewhat broken specimen. 



1 This observation of mine seems not to agree with that of Lischke, who in his Japanisehe Meeres- 

 Conchylien, 2d voL, p. 104, pi. v. figs. 13, 14, says, "von den beiden Falten der Spindel ist die obere 

 massig." As he describes the lower one, however, as " sehr kraftig," one may recognise from his figure that 

 both expressions rather exaggerate the features they describe, and that his description of the upper tooth as 

 "massig" is not materially different from my "feebler.". 



