228 



oval, slightly angular above, right margin slightly broken, probably varicose in the adult shell ; 

 columellar margin thickened below, reflected over the umbilical region. 

 ^ ; Ah. II, lat. 3.75; apert. alt. 2, lat. i^o Mill. 



This species has superficial resemblance with the preceding one, but has a much coarser 

 sculpture and is much less shouldered. 



16. Scala (Opalia) Nicrstraszi n. sp. . 



Stat. 159. o°59'.iS., I29°48'.8E. Halmahera Sea. 411 M. Coarse sand, i Spec. 



Shell small, pyramidal, imperforate, solid, white; nucleus wanting; i-emaining whorls 7^.3, 

 moderately convex, with a distinct but no deep suture; sculpture consisting of impressed spiral 

 striae and fine radiating ones over the whole surface, if not rubbed of; ribs strong, thick, 

 incised by the spiral striae, ten on last whorl; the last very thick rib bordering the aperture. 

 Basal rib of last whorl strong; base slightly excavated, sculptured with faint spiral striae, crossed 

 by the growth-striae. Aperture circular with a nearly smooth, rather thick internal lip, bordered 

 on the right and part of basal margin, by a broadly expanded flat varix, with the same 

 sculpture of the outer surface of shell. 



Alt. 6Y3, lat. inch perist. .3^4; diam. of apert. iYg Mill. 



I know no species allied to this beautifully sculptured shell. 



17. Scala (Cirsotrcma) sp. 



Stat. 153. o°3'.8N., 130° 22'. 3 E. North oft' Waigeu-island. 141 M. Fine and coarse sand with 

 dead shells. 2 Spec. 



Both specimens are young, they have some resemblance with the upper whorls of S. 

 Kieneri Tap. Can. but are different in their sculpture, which is very fine; as even the apertures 

 are incomplete, I have abstained myself from naming and describing them, though they probably 

 belong to a new species. 



