252 EET. E. BOOG WATSOIir ON THE 



and hardly advances to the end of the snout, the canal-edge 

 being thick and rounded, cut off obliquely upwards, but not at all 

 reverted. H. 0-3. B. 0-1. Penultimate whorl, height 0-03. 

 Mouth, height O'l, breadth 0-06. 



This is an extremely peculiar little shell, remarkable in its 

 narrow cylindrical and compact form, its sculpture, and its slight 

 silvery sheen, from which last feature its name is derived. 



69. Pleueotoma (Deillta) lophoessa, n. sp. (\o(j)6€is, 

 crested.) 



St. 120. Sept. 9, 1873. Lat. 8° 37' S., long. 34° 28' W. 

 Pernambuco. 675 fms. Mud. 



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

 Pernambuco. 350 fms. Mud. Var. platia (ttXutvs). 



Shell. — High, narrow, conically cylindrical, with a blunt round 

 apex, a contracted conical base, and shortish snout ; it is angu- 

 lated, aud the angulation crested with little conical points ; 

 there are feeble ribs and an impressed suture. Sculpture. Lon- 

 gitudinals — there are 12-13 ribs on each whorl from the second 

 regular whorl onwards ; but they are in no way connected from 

 whorl to whorl ; they originate below the sinus-area in a little 

 sharpish rounded nodule ; crowning an angulation of the whorl 

 at that point, they run forward direct but obliquely to the inferior 

 suture ; on the base they die out with a backward curve to the 

 left, and do not reach the snout ; in the sinus-area above the 

 nodule they are just traceable in a slight irregularity of the 

 surface and a minute nodule at the suture ; the lines of growth 

 are quite independent of the ribs, and are very faint except 

 towards the point of the base. Spirals — at the top of each whorl 

 is a minute projecting band beset by very small conical nodules 

 corresponding to the longitudinal ribs. About one third down 

 the whorls there is an angulation accentuated by the rib-nodules ; 

 halfway between this and the inferior suture a minute sharpish 

 thread appears on the penultimate whorl, while other four, similar 

 and equally parted, appear on the base ; all these five threads rise 

 on the ribs into minute sharpish nodules. On the snout there 

 are neither ribs nor spiral threads, only obsolete lines of growth. 

 Colour pale greyish-white. Spire conically cylindrical, the last 

 whorl being very small and the earlier ones broad ; the profile- 

 lines are interrupted by the nodulous angulation and the im- 



