ACLIS. 89 



25 sharp, flexuous, lougitudinal ridges, and no spiral sculpture. 

 Length, 2*5 mill. 



Mediterranean, Bay of Biscay, W. Africa, Azores. 



A. HYALiNA, AVatson. PI. 17, fig. 52. 



Minutely umbilieated, thin, glossy, white ; whorls 12, convex, 

 smooth or with faint indications of ribs, especially on the upper 

 whorls, under a lens the surface appears angulated or raalleated 

 with slight decussating striae. Length, 10 mill. 



Off Pernambuco, SoO fms. 



A. Jeffreysii, Tryon. PI. 18, fig. 69. 



Thin, semitransparent, glossy, whitish ; whorls 8, very slowly 

 enlarging, with close, longitudinal, thread-like riblets, and very 

 slight microscopic spiral striae ; no umbilicus. Length, 3"75 mill. 



Tunis; W. Coast of Africa, SOO-1261 fins. 



Described by Dr. Jeffreys as A. striata, a name preoccupied by 

 Prof Verrill. ' 



A. MizoN, Watson. PI. 17, fig. 51. 



Thin, lustrous, white ; whorls 15-16, convex, with about 40 

 feeble, unequal, rounded riblets; minutely umbilieated. 

 Length, 15 mill. 



Teney^iffe. 



Section Pherusa, Jeffreys, 1869. 



A. GuLSON^, Clark. PI. 17, fig. 43. 



Very thin, transjDarent, lustrous, clear white, Anthout sculpture, 

 spire with a blunt, nearly globular apex, which is decidedly intro- 

 verted but not sinistral ; whorls 6-7, convex, with deep suture ; 

 outer lip remarkably flexuous, prominent, ex^mnding, almost 

 notched below ; umbilicus closed, but with a chink-like depression. 

 Length, 1'7 mill. 



Europe, Madeira. 



Section Iol.ea, A. Adams, 1860. 



A. sciTULA, A. Ad. PL 17, fig. 44. 



Rather solid, white ; whorls 6, slightly convex, with subdistant 

 spiral grooves, the interstices longitudinally finely striated. 

 Length, 3 mill. 



Strait of Corea. 



