48 



Length 2 1 mill, diam. of apert. i.6 mill, of apex 1,2 mill. 



Leno-th 22 mill., diam. of apert. 1,6 mill., of ape.x 0,2 mill. 



Length 16,2 mill., diam. of apert. 1,5 mill., of apex 1,2 mill. 



Length 16 mill., diam. of apert. 1,1 mill., of apex 0,4 mill. 



56. Dental iuni carnc7nit n. sp. PI. YI, figs 42 — 45. 



Stat. 45. 7° 24' S., 118° 15.2 E. Flores Sea. 794 Metres. Fine grey mud. 15 Spec. 

 Stat. 300. io°48'.6S., 123° 23'.! E. Timor Sea. 918 Metres. Fine grey mud. i Spec. 

 Stat. 181. Ambon. Mud, sand and coral. 54 Metres. 2 Spec. 



Diagnosis. Shell more slender than subrechim, and more curved, cylindrical. Reddish 

 brown or salmon coloured, becoming a little lighter coloured toward the anterior aperture; often 

 with some opaque white bands. Apex truncated, with a small supplemental tube; the young 

 very acicular. 



Length 22,5 mill., diam. of apert. 1,3 mill., of apex 0,6 mill. 

 Length 20,5 mill., diam. of apert. 1,4 mill., of apex 0,5 mill. 

 Length 18,5 mill., diam. of apert. 1,4 mill., of apex 0,6 mill. 



Measurements of very young individual : 

 Length 15,5 mill., diam. of apert. 0,8 mill, of apex 0,08 mill. 



Remarks. This species greatly resembles subrectum but is rather more curved, decidedly 

 more slender, and more deeply coloured. None of the specimens examined are as broadly 

 truncated as some of the specimens brought by Mr Sluiter of subrechnii, the diameter of the 

 apex exceeding nowhere 0,6 mill. 



It is also very like the Panamic D. innumerabile P. & Sh. but is distinguished from that 

 species, by being cylindrical, while innumerabile is laterally compressed and proportionally broader. 



Subgenus Bathoxiphus Pilsbry & Sharp 1897. 

 Bathoxiphus Pilsbry & Sharp, Man. of Conch., vol. XVII, p. 121. Type D. eitsin////s ]effreys. 



Shell thin, conspicuously compressed laterally, nearly or quite smooth, with a broad slit 

 on the convex side of apex. (P. & Sh.). 



57. Dcntaliniu. tricarinahiiu n. sp. PI. VI, figs 40, 41. 



Stat. 178. 2°40' S., 128° 37'. 5 E. Ceram Sea. 835 Metres. Blue mud. 3 Spec. 



Stat. 208. 5° 39' S., 122° 12' E. Banda Sea. 1886 Metres. Solid green mud. i Spec. 



Stat. 211. 5°4o'.7S., I20°45'.5 E. Banda Sea. 1158 Metres. Coarse grey mud, superficiallayer 



more liquid and brown. i Spec. 

 Stat. 300. iO°48.6S., 123° 23. i E. Timor Sea. 918 Metres. Fine grey mud. 2 Spec. 



Diagnosis. Shell considerably curved, strongly laterally compressed, forming thus a 

 narrow arch on the outer, and a sharp keel on the inner curve. Besides these there are two 

 lateral longitudinal keels or ribs, running closer to the concave side. Arch and keels sharp at 

 and near apex, becoming blunter toward the anterior aperture. Colour white, porcellanous, with 



