704 



EEV. R. BOOG WATSOIf O'N THE 



pearly layer. Pillar-Up bends over the umbilicus, is a little re- 

 verted, and expands info a tooth at the intra-umbilical ridge. 

 UmUlicus funnel-shaped, wide, pervious, but narrowed within by 

 the spiral ridge. Operculu7n of very many narrow whorls, which 

 on their outer edge overlap as a narrow gleaming flange. H. 0"32. 

 B. 0-32, least 28. Penultimate whorl 09. Mouth, height 0-18, 

 breadth 0-18. 



This is a much larger species than T. (ilT.) cmereus, Couth., 

 from the North Atlantic, much higher, much more conical, much 

 more exquisitely sculptured, suture more impressed, base more 

 tumid and not angulated at the edge, umbilicus larger. 



Than T. (M.) amahilis, JefFr., it is, of course, still larger, less 

 conical, less angulated, the sutural impression is not like a 

 rounded gouged-out line as it is there, the base is not flattened, 

 and the whole style of sculpture is totally distinct. 



The measurements given above are taken from an almost 

 exceptionally fine specimen from St. 78. 



9. Tkochus (Maegaeita) jeglees, W. (aiyXtjeis, beautiful.) 



St. 24. Mar. 25, 1873. Culebra Island, St. Thomas, Danish 

 West Indies. 390 fms. Mud. 5 grow^n and many young spe- 

 cimens. 



Shell. — Broadly conical, high, with a very large umbilicus, 

 ornamented with rows of tubercles, carinated. Sculpture. Spirals 

 — there is a row of small round pointed tubercles a little below 

 the suture. The carina is double, formed by two rather remote 

 tubercled threads, the lower of which runs to the outer lip. 

 Below this one is a broadish furrow and slightly beaded thread, 

 which, towards the mouth, projects so as to become a third 

 carina. The centre of the base has another slightly beaded 

 thread ; and another, formed of remote rounded tubercles, defines 

 the umbilicus, within which is a very slight furrow and an ill- 

 defined ridge. Longitudinals — the apical whorls are ribbed, but 

 the ribs gradually break into the scarcely connected tubercles of 

 the last whorl. The lines of growth are hardly perceptible, ex- 

 cept on the base. Colour pure white when weathered, but appa- 

 rently slightly brownish when fresh, with a pearly nacre below 

 the thin calcareous surface-layer. Spire high, very slightly 

 scalar. A'pex sharp, minute, flattened on the one side, with the 

 very small embryonic 1\ whorl rising sharply on the other. 

 T^/^or/s 7, of regular increase ; the last is small, from the large 



