SMARAGDINELLA-ATYS. 261 



that it forms, when it Avinds, a cup shaped appendage. In S. sie- 

 holdi, however, the lamella is so narrow that a spiral ridge only is 

 visible. {Ad.). 



Glauconella adamsii Gray, (Bulla smaragdlna Adams Mss.) is 

 known only by three sketches by Adams of a living Smaragd'mella, 

 published in Gray's "Figures of Molluscous Animals," pi. 178, figs. 

 1, la, \h ; p. 95. It is, of course, quite unidentifiable. 



Section Nona H. & A. Adams. 



Shell internal, subtrigonal, slightly involute, white, fragile; inner 

 lip with a cup-shaped appendage, sj^irally entering ; outer lip pro- 

 duced posteriorly. 



S. ALGiR.is Hanley. PI. 83, fig. 59. 



Shell subtrigonal, white, thin, concentrically lightly undulated ; 

 aperture very large, trigonal, outer lip elevated above the spire, 

 angulated, acuminated, contracted in the middle, anteriorly pro- 

 duced ; columella much arched, last whorl small, trigonal ; append- 

 age small, acuminated. {Sowh.). 



Algiers (Mc Andrew). 



Linteria algirce Hanley, A. Ad., Thes., p. 598, pi. 121, f. 55. — 

 SowB., Conch. Icon. f. 6. — Smaragdinella (Nona) algirce H. & A. 

 Ad., Gen., p. 23. 



Genus ATYS Montfort, 1810, 



Aiys MONTF., Conch. Syst. li, p. 34o, type A. cymbuius^^naucim. 

 — Alicula Ehrenberg, Symbols Phys., decas 1st, 1831, type A. 

 cylindrica. — Naucuvi Schum., Essai, p. 79, 259, type N. striatulum 

 Schum.=^. naucum L. — Moxania Leach ms., Gray, P. Z. S. 1847, 

 p. 161, type B. cranchii=B. utriculus. — Roxaniella Monts., Nom. 

 Gen. e Spec. p. 145, type B.jeffreysi Weink. — Weinlcauffia. Adams, 



Dinia Ads., Gen. Rec. Moll, ii, p. 21, type D. dentij'era. 



Shell varying from globose-oval to subcylindrical-oval, involute, 

 the spire concealed ; aperture as long as the shell, produced above 

 the vertex ; lip rising from the center of the vertex, and having an 

 angular fold there ; outer lip simple and arcuate ; columella short, 

 subreflexed, with a fold-like truncation, or arcuate, the umbilieus 

 generally not wholly closed. Type A. naucum. 



18 /■ 



% 



<>j 



'ii 



