486 THE VOYAGE OF H.M.S. CHALLENGER. 



a shortly produced and rounded base. Suture a little oblique and somewhat constricted. 

 Mouth small, pear-shaped and oblique. Outer Up thin and sharp, shortly arched at its 

 insertion, and then nearly straight to the base, where it is almost semicircular and barely 

 patulous. Inner lip pretty thick on the body, with a strongish tooth, concave to the 

 point of the short pillar, on which it is sharp-edged and slightly reverted, having a small 

 umbilical furrow behind it. H. 0-064 in. B. 0"03. Mouth, height 0'023, breadth 0-021. 



This species is slightly like the young shells of the very stumpy form of Odostomia interstincta, 

 Mont. 



11. Odostomia pupa, 1 n. sp. (PI. XXXI. fig. 7). 



September 8, 1874. Flinders Passage, North-east Australia. 7 fathoms. 



Shell. — Cylindrical, high and narrow, few-whorled, obsoletely ribbed, with a blunt tip, 

 a small mouth, and a toothed pillar. Sculpture: Longitudinals — there are very feeble 

 rounded lines of growth ; there are also on the last whorl about 20 (on the earlier fewer) 

 flat rounded inconspicuous ribs, which die out above the periphery. Spirals — none (the 

 shell, however, is somewhat rubbed). Colour porcellanous. Spire high and cylindrical, 

 but toward the top convexly conical. Apex abrupt and truncated, the extreme point 

 being turned in. Whorls in all 7 ; rather high, flat on the side ; the last is small, but a 

 little elongated, and on the base rounded. Suture slightly and linearly impressed. 

 Mouth small, shortly pear-shaped. Outer lip almost straight in its direction, on the base 

 rounded but barely patulous. Inner lip strongly continuous and straight across the 

 body, and with a very short pillar ; in the middle of the lip there is a strongish blunt 

 tooth. H. 0-13 in. B. 0*045. Mouth, height 0-04, breadth 0"024. 



This species is a good deal in the style of Odostomia minuta, A. Ad., from the Mediterranean, 

 but is stumpier and larger, the obsolete ribbing is stronger, the apex is different, and the labial 

 tooth is more marked. It is extremely like Odostomia paucistriata, Jeffr., but is more cylindrical 

 (i.e., less contracted toward the apex), is smaller, and is more coarsely ribbed. 



12. Odostomia kymatodes," n. sp. (PI. XXXI. fig. 8). 



September 8, 1874. Flinders Passage, Cape York, North-east Australia. 7 fathoms. 



Shell. — Strong, rather long and narrow, convexly conical, ribbed, strongly toothed, 

 with flat-sided conical whorls, an impressed suture, a rounded slightly produced base, a 

 small oval mouth, and a blunt rounded top out of which on one side rises a small dome- 

 shaped tip. Sculpture: Longitudinals — there are on each whorl about 19 strongish, 



1 So called because like the pupa of some insects. 



2 xv/j.a.rudric, wavy 



