284 REV. R. BOOG WATSON ON THE 



MoLLTJSCA ofH.M.S. ' Challenger 'Expedition. — Part XVIII. 

 By the Eev. E. Booa Watson, B.A., F.E.S.E., E.L.S. 



[Published by permission of the Lords Commissioners of the Treasury.] 



[Read March 15, 1883.] 



Order OnsTHOBRAisrcHiA, Milne- Edwards. 



Family Tornatellid^, Fleming. 

 Grenus AcTiEON, de Montfort. 



1. A. {ActcRonina) edentulus, n. sp. I 4. A. austrinus, n. sp. 



2. A. [A.) chariis, n. sp. 5. A. amabilis, n. sp. 



3. A. turritus, n. sp. | 6. A.{Buccinulus)cinereus,u.s\i. 



1. ACTiEON (AcTiEONINA) EDENTULUS, n. sp. 



St. 149 c. Jan. 19, 1874. Lat. 49° 32' S., long. 70° E. Bal- 

 four Bay, Eoyal Sound, Kerguelen. 60 fms. Mud. 



Shell. — Fragile, ovate, white, with a thin chestnut epidermis, a 

 bluntish. scalar spire, a largish mouth, inner lip untoothed. Sculp- 

 ture. 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 

 fujrows 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 epidermis, which is a little 

 darker below the suture and on the base. Sjyire rather high, 

 roundedly and bluntly conical, scalar. Apew slightly eroded, but 

 evidently blunt, large, and slightly inverted. Whorls 5g, some- 

 what convex, of rather rapid but regular increase ; the last is long 

 and cylindrical, with a rounded produced 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 



