196 M. M. SCHEPiMAN, LAND- AND FRESHWATER MOLLUSCA ETC. 



writing-pen or feather, with a rather long, pointed stalk, the blade consists exteriorly of about 

 15 imbrications, of which S are transversely uninterrupted, with waved margins, the other 

 ones are divided in 2 parts by a narrow ridge; the margin of the blade is slightly crenulated 

 on the right side, strongly so on the left one (reversed in the other palet), thèse crenulations 

 are the ends of raised ridges directed upwards, sometimes with perpendicular riblets between 

 them ; the blade terminâtes in a point; the lower imbrications are covered by a corneous 

 epidermis, this external side is convex, especially at the lower imbrications; interiorly the 

 blade is slightly concave, with the imbrications uninterrupted on the whole length, with 

 waved lines, each imbrication transversely striated, parallel to its anterior margin. 



Length 12 mill. The sculptnre may be slightly variable in secondary particulars. 

 New Guinea. Merauke, from wood of the pier, 1904. (Dr. Koch leg.) 



I know no species with which to compare this new one, the palettes are quite peculiar 

 and hâve only a superficial resemblance with those of N. saitlii Wright, that species has 

 however very large auricles at the valves. I hâve named it in honor of Dr. C. HEDLEY, who 

 has had the kindness to compare the species, though I was nearly convinced that it is undescribed. 



