MOLLUSCA OF THE * CHALLENGER ' EXPEDITION. 707 



TTmhiliciis open, funnel-shaped, internally scored with, minute 

 longitudinal ribs. H. 0-25. B. 0-21, least OlS. Penultimate 

 whorl 0'05. Mouth, height 0-1, breadth 0-09. 



The specimen from which I have described this is in bad con- 

 dition ; but the species is certainly distinct from any other known 

 to me. 



12. TBOCnUS (MAEaAEITA) INETJlSrDIBTJLirM:, W. 



St. 56. May 29, 1873. Bermudas. 1075 fms. Grey ooze. 

 2 specimens, not full-grown. 



St. 146. Dec. 29, 1873. Lat. 46° 46' S., long. 45° 31' E. 

 Marion Island. 1375 fms. Bot. temp. 1°'5 C Glohigerina-ooze. 

 5 specimens (3 with the animal in spirit). 



Animal of a uniform light colour. Foot broad, bluntly pointed 

 behind. Appendages 5, probably 6, large, between which the 

 membrane above them is edged with many small ones. 



Shell. — Conical, with a tumid base, carinated, umbilicated, thin, 

 translucent, pearly. Sculphore. Spirals, on the upper whorls 2, 

 on the body-whorl 7-8, pretty strong, but fine beaded threads. 

 The first lies remote below the suture, and is sparsely ornamented 

 by longitudinally produced, high and pointed, tubercles; it 

 forms a shoulder on the whorl. The second projects strongly and 

 sharply at the periphery and forms the carina; it and those 

 below are delicately fretted with close-set small beads. The third, 

 which meets the outer lip, lies within the contraction of the base. 

 The last two are closer than the rest, which, however, are some- 

 times brought closer by the additional thread which appears 

 among them. The on« which defines the umbilicus is more 

 sharply beaded than the rest. Longitudinals — below the suture 

 and near the umbilicus the surface is sharply but delicately 

 puckered, and these puckerings, strong in the early whorls, are 

 in the later faintly continued across the whorls as lines of 

 growth. Colour yellowish white, with a brilliant nacreous sheen 

 shining through the thin superficial calcareous la,jer, which be- 

 comes more opaque in drying. Spire high, scalar. Apex minute, 

 flattened, with the minute bulbous embryonic 1^ whorl projecting 

 on one side. Whorls 8, of rapid increase, rounded, but angulated 

 by the projection of the spirals, very tumid on the base. Suture 

 linear, but strongly defined by the contraction of the supra- 

 jacent whorl and the flat shoulder of the one below. Mouth 

 very slightly oblique, round, but ou the pillar flattened, and at the 



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