326 EEV. E. BOOG WATSON ON TEE 



St. 151. Feb. 7, 1874. Lat. 62° 59' 30" S., long. 73° 83' 30" E. 

 Off Heard Island. 75 fms. Mud. 



Shell. — Small, ovate, striated, with a shortisb, scalar, blunt- 

 tipped apex, a rounded base, very small snout, and semicircular 

 moutb. Sculpture. Longitudinals — there are strongisb numerous 

 hair-like lines of growth. Spirals — below the suture is a shoulder 

 marked by an angulation carrying a thread ; the shoulder is in- 

 distinctly scored with spiral threads : from the angulation to the 

 snout there are several well-marked threads parted by shallow 

 broader furrows ; toward the point of the snout is a twisted scar. 

 The whole surface is scored by fine, almost microscopic lines. 

 Colour porcellaneous white under the thin dirtyish yellow epi- 

 -dermis. /S^^w-e rather short and broad, conical, scalar. Apexhlviut, 

 round, a little bent in at the tip. Whorls 5|, rounded, slightly 

 angulated near the top, with a slight shoulder above the angle, of 

 rather regular increase ; the last has a somewhat produced base 

 and a very small snout. Sidure impressed. Mouth rather large, 

 semicircular. Outer lip regularly rounded and open ; seamed 

 within by the spirals of the surface. Inner lip well defined, nar- 

 row, having a talc-like iridescence*, very straight on the pillar, on 

 the front of which the glaze turns sharply over to the inner side, 

 and leaves there a very slight chink in front : at the point of the 

 pillar the edge is twisted and is bluntly prominent, and above this 

 are one or two faint folds. H. 0'45. B. 0'27. Penultimate 

 whorl, height O'l. Mouth, height 0-22, breadth OIG. 



In form this species resembles A. viridula, 'Fabr., = Cotithoiii/i, 

 Jay, of the British Museum ; but that species has not the talc- 

 like inner lip, is not so well shouldered, nor is the shoulder defined 

 by a spiral thread, and the spirals in general are much stronger ; 

 the body-whorl is larger, more tumid, and more contracted on the 

 base. Dr. Kobelt very kindly copied out and sent me the dia- 

 gnoses of two species of Cancellaria from the Straits of Magellan, 

 with which he thought I might wish to compare this of the 

 ' Challenger.' These are C. (Admete) australis, Philipj)i, and 

 C. (A.) Schi/thei, Phil. I have not, I think, seen either of these ; 

 but they both seem to be very much more strongly ribbed and 

 spiralled than the present or following species. One of the 

 specimens from Kerguelen contains the animal ; but I failed to 

 extract it, and only ascertained that there was no operculum. 



* From this feature I have derived the narue of the species. 



