444 BEV. R. B00G WATSON ON THE 



lines of growth. Spirals — the whole surface is scored with fine 

 narrow impressed furrows, which are about half the width of the 

 raised interstices. Colour uniform pellucid ruddy brown, paling 

 towards the point of the snout. Spire rather high, but not small, 

 conical, but with convex profile-lines. Apex: 2| embryonic 

 whorls, which rise in a conically globose form to a blunt rounded 

 point with the very small tip, which is immersed and bent down on 

 one side. Wliorls 5, slightly convex, rather short and broad except 

 the last, which is long and narrow, having a produced, broad, and 

 conical base, ending in a broad undefined snout. Suture very 

 slightly impressed in consequence of a faint swelling of the superior 

 and inferior whorls. Mouth oblong, pointed above, and broadly 

 truncate below, at the end of the scarcely contracted canal. Outer 

 lip, which is a little contracted above and a little patulous below, is 

 a flat curve in both its planes ; the edge projects into a small high- 

 placed shoulder, between which and the body lies the shallow, 

 open, rounded sinus, with a very minute, short, triangular shelf 

 above it. Inner lip : there is a thin narrow glaze on the body 

 and pillar; at the junction of these two there is a very slight con- 

 cave curve ; otherwise the line is very direct and is slightly ob- 

 lique ; the glaze does not extend quite to the point of the pillar, 

 which is scarcely twisted or truncated. H. 0*12. B. 0*049. 

 Penultimate whorl, height 0-03. Mouth, height 0*06, breadth 0-024. 

 This species is perhaps the one of all the following group which 

 conforms most nearly to the type, Columlella nana, Lov., for 

 which Dr. Gwyn Jeffreys suggested the subgeneric name of 

 Thesbia (see Brit. Conch, iv. p. 359). I have followed Prof. 

 G-. O. Sars in connecting the group with the Pleurotoma family, 

 though he will probably find my group a little heterogeneous ; 

 and I am unable to follow him in giving it the dignity of a genus, 

 nor can I, in the face of his type, accept " spira breviuscula" as one 

 of its characteristics (Moll. Arct. Norv. p. 221, see pi. xvi. fig. 2). 



43. Pleueotoma (Thesbta) transluctda, n. sp. 



St.l45A. December 27, 1873. Lat.46o43'5"S.,long.38°4'30"E. 

 Halfway between Marion Island and Prince-Edward Island. 

 150 fms. Gfrey sand. 



St. 149 b. January 17, 1874. Lat. 49° 28' S., long. 70° 30' E. 

 Entrance of Boyal Sound, Kerguelen. 30 fms. Mud. 



St. 149 d. January 20, 1874. Lat. 49° 28' S., long. 70° 13' E. 

 Boyal Sound, Kerguelen. 28 fms. Mud. 



Animal. — Foot fuscous olive, large, thick, square in front, 



