492 THE VOYAGE OF H.M.S. CHALLENGER 



elongated, shining, ribbed, and spirally smooth shell, but I do not know the species, and the descrip- 

 tions I have seen are too vague, and the figure in Binney's " Gould " too independent of the text to 

 make anything but a bad 'guess possible. 



22. Odostomia (Turhonilla) rhdbdoides, 1 n. sp. (PL XXXII. fig. 5). 



Station 188. September 10, 1874. Lat. 9° 59' S., long. 139° 42' E. West of Cape 

 York, North-east Australia. 28 fathoms. Green mud. 



Shell. — Strongish, almost acicular, conical, ribbed and spiralled, with a small top, flat- 

 sided subcylindrical whorls, a slightly impressed suture, a short rounded base, and a small 

 rhomboidal mouth. Sculpture: there are on each whorl about 18 small flatly rounded 

 ribs, parted by shallow furrows of about the same breadth ; the ribs at the top of the 

 whorls are slightly bent, but for much the greater part of their course are straight ; they 

 die away rapidly, but not suddenly, on the base. Spirals — the intervals of the ribs are 

 closely scored throughout with small flat threads and shallow furrows ; these are faint but 

 traceable on the base. Colour white. Spire almost acicular. being barely conical. Apex 

 broken, but evidently small, and apparently, judging by the scar, discoidal or nearly so. 

 Whorls 11, at first rather long, but latterly not markedly so, flat, and barely conical : the 

 last is a little abruptly rounded on the base. Suture very slightly openly and shallowly 

 impressed. Mouth small, rhomboidal. Outer lip somewhat broken, slightly convex, 

 patulous on the base. Inner lip very thin, but defined on the body, obtusely angulated 

 at the pillar top, which is encompassed by a very slight depression ; the pillar is very 

 oblique, and has a long and marked twist on it. H. 0"19 in. B. 0-038. Mouth, height 

 0-03, breadth 0"02. 



In form this slightly resembles Odostomia. rhabdoid, Wats., but is still longer and narrower, with 

 flatter whorls, and the sculpture is quite different. Odostomia kymatocssa, Wats., is much broader. 



23. Odostomia (Turhonilla) kymatoessa, 2 n. sp. (PI. XXXII. fig. 6). 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30" W. Off Culebra 

 Island, West Indies. 390 fathoms. Pteropod ooze. 



Shell. — Thin, narrow, conical, glossy, transparent, with a coarsish half-reverted dis- 

 coidal sinistral tip, flatly convex whorls, a shallowly impressed open suture, a rounded, 

 conical, scarcely f produced base, and a small narrowly oval mouth. Sculpture: Longi- 

 tudinals — there are on each whorl about 14 straight, direct, narrow, pinched-up ribs, 

 parted by broad open rounded furrows of two to three times their width ; they do not run 

 on continuously from whorl to whorl, nor do they extend to the. base. Spirals — the whole 



\a.fiboiibri!, rod-like. 2 xvpoLroti;, wavy. 



