MOLLUSCA or THE ' CHALLENGED EXPEDITION. 335 



mouth ; while in Z7. leucus tlie top is highest on the side away 

 from the mouth. 



IT. vortex, Dall, seems to present several points of resemblance ; 

 but that species seems to taper much more toward the tip, to be 

 differently and miich more strongly sculptured, to have no pillar- 

 tooth, and to be very much broader in proportion to length 

 (4'25 millim. to 7*5 millim.). 



The Tornatina eximia, Baird, has a more perfectly cylindrical 

 form, a higher spire, and a much wider mouth. 



10. Uteicttlus complanatus, n. sj). 



St. 188. Sept. 10, 1874. Lat. 9° 59' S., long. 189° 42' E. 

 West of Cape York, off" S."W. point of Papua. 28 fms. 



Shell. — Minute, cylindrical, truncated and flat on the top, very 

 much and obliquely truncated in front, with whorls angulated 

 above and furrowed longitudinally and spirally, a papillary apex, 

 a longish pillar, and a club-shaped mouth. Sculpture. Longi- 

 tudinals — the furrows on the lines of growth are strong and 

 curved. Sj^irals — the whole surface is scored by sharp irregular 

 furrows parted by flat intervals of about three times their width. 

 Colour white. Mouth the full length of the shell, narrow above, 

 oblong and roomy in front, club-shaped. Whorls 3 ; on the 

 top of the shell they are rounded. Suture slightly impressed. 

 Outer lip rises roundly the least thing above the top ; its course 

 is straight, with a very slight concavity ; its edge is prominent. 

 Top perfectly flat, with a roundly angulate edge ; the individual 

 whorls are rounded, and are parted by a somewhat impressed 

 suture ; the central tip, which is glossy, is papillary, but 

 depressed. Inner lip is, on the body, slightly concave in its 

 course ; the pillar is oblique, nearly straight, and is patulous. 

 L. 0'05. B. 0-028. Breadth of mouth at same place, 0-013. 



This is a very small species, the solitary specimen of which is 

 not in good condition. It is a good deal like U. truncatulus, 

 Brug. ; but the sculpture is a very marked feature of difference 

 and the form is more stumpy. 



11. Uteicxtlus toenattjs, n. sp. 



St.YII. Eeb. 10, 1873. Lat. 28° 35' JS., long. 16 5 W. 

 Teneriff'e. 78 fms. Coral. 



Shell. — Small, cylindrically oblong, a little tumid in front, 

 slightly narrowed backwards, rounded at the shoulder, longi- 

 tudinally and spirally striate, with a flat top, a small papillary 



