424 EEV. B. BOOG WATSON ON" THE 



The base, which, is a good deal contracted, is conical, and runs 

 out into a fine longish snout. Mouth club-shaped, being some- 

 what pointedly rhomboidal above, .with a longish canal below. 

 Outer lip thin, with a pretty regular convex curve, which is flat- 

 tened at the summit, and prolonged in a straightish line at the 

 canal ; on leaving the body it retreats at once to the left, leav- 

 ing a very small shelf above the sinus, which is shaped like an 

 open U with diverging margins : toward the lower part of the 

 mouth the lip runs out in a pinion-shaped projection, retreating 

 thence to the point of the pillar. Inner lip thin and narrow, 

 little concave, with a long sharp-edged truncation of the point of 

 the pillar. H. 0'18. P. 0-08. Penultimate whorl, height 0-03. 

 Mouth, height O08, breadth 0-03. 



The only specimen of this beautiful little species is not full- 

 grown. It is broader in form and finer in the apex than P. 

 holbodes, W., or any other of that group, of which it most resem- 

 bles perhaps P. stirophora, ~W. Possibly in a more developed 

 condition it may in form approach more nearly to P. fluctuosa, 

 W., from which its sculpture entirely removes it. 



26. Pletjeotoma (Deillia ?) tmeta, n. sp. (V^ros, fur- 

 rowed.) 



St. 122. Sept. 10, 1873. Lat. 9° 5' S., long. 34° 50' W. Off 

 Pernambuco. 350 fms. Mud. 



Shell. — A mere fragment of two whorls, but with very marked 

 features. It is evidently high and narrow, with short and nume- 

 rous whorls, which are sharply but broadly angulated very much 

 above the middle ; the shoulder above the angulation is scored 

 by very many sharp curved threads, the scars of the old sinus ; 

 the rise of these forms a collar below the suture, which is thus 

 distinct. The angulation is raised into a keel by rounded tuber- 

 cles, which are the origin of narrow, curved, very oblique ribs, of 

 which there are twelve on the last whorl ; they extend to the base, 

 but not to the snout, which is very small and short. The whole 

 surface is closely scored by fine, rounded, spiral threads. The 

 sinus of the outer lip is separated from the body by a narrow 

 shelf, and is shallow, rounded, and open on the underside, where 

 the convex shoulder of the lip lies very low. The narrow inner 

 lip has a small pad above, is rather oblique and concave in the 

 middle ; the front of the pillar is very slightly truncated obliquely, 

 and has a sharply rounded and hardly twisted edge. The mouth 



