8MARA<;i>!NI I.I A -A1 



that it forms, when it winds, a cup shaped appendage. In S. tie- 

 bnldi, however, the lamella is > narrow that a spiral ridge only is 

 visible. (Ad.~). 



nd'iinsii Gray, (Buf/a mwragdina Adams M>s.) is 

 known only by three sketches by Adams of a living Sunin-- 

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

 1, If/, 16; 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, spirally entering ; outer lip pro- 

 duced posteriorly. 



S. ALGIR;E Hanley. PI. 33, 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. (SoivbS). 



Algiers (Me Andrew). 



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

 Sows., Conch. Icon. f. 6. Smaragdinclla (Nona} algirce H. A: A. 

 AD., Gen., p. 23. 



Genus ATYS Montfort, 1810, 



Atys MONTF., Conch. Syst. ii, p. 343, type A. 

 Alicula EHRENBERG, Symbolic Phys., decas 1st, 1831, type -4. 

 cylindrica. Naucum SCHUM., Essai, p. 7I>, 259, type N. striatulum 

 Schum.=J.. naucum L. Roxania LEACH ms.,GRAY, P. Z. S. 1847, 

 p. 161, type B. cranchii=-B. ntri<-uln*. Roscanieila MONT.-., Num. 

 Gen. e Spec. p. 145, type R. jcffreysi Weink. Wein kn utfin. ADA M s 



Dinia ADS., Gen. Rec. Moll, ii, p. 21, type D. deutifera. 



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 umbilicus 

 generally not wholly closed. Type A. 

 18 



