,s,s 



, M:I:V. Ban, IM. 1*. ti->. 72, 7fc 



Shining. vitrn.u>, white. >mooth; whorls !, convex, narrower 

 and not so rapidly increasing as the precedini: species. 

 Length, 5'5 mill. 



Not 



..i v, Sara. PI. 17. ii-_ 



WhitMi. ~uliopa(|ue. ulaKroii-. whorl> <\ .-lightly convex, the last 

 a little dilated at the aperture, u in l>i liens distinctly riniate. 

 Length. : mill. 



Arctic Nonc'iii. 



A. x -. Jeffreys, IM. 17, fi;:. 40. 



Thin, \\hii.-. HI ..... th. transpan-nt, glossy: whorls 6-7, Convex, 

 suture \\ell-defined. hut not deep. Length \"2~> mill. 



.I/////// //"// "///. 



The aperture is a little more contracted helow than in the last 

 species and the columella more perpendicular; perhaps not adult. 



A. BAB1BBA, WatN.ii. IM. 17, fur. .",4. 



Smooth, white, L r l>sy, umhilicus a mere chink: whorls!); well 

 n.uiided : with a few slight .irrowth lines. Length, 3*75 mill. 



OffPerinniifnifn. :;.")() ?'///>. 



Broader, uith t'ewei-, rounder whorls than in A. W<tJI> ,-i. 



A. MIM i i IM \. \Vat>on. IM. 17. li_ 



onth. pale l.n.wnish hyaline; whorls 7, slightly convex. 

 ;ure a little narrowly produced helow. Length -*1~) mill. 



Off I!" iii< />/.. A'. II. A n*t r'l/iii. 1 ")")_;///>-. 



Prohahly the -nialle-t known -MMi'opod, being the One-hundret 1th 

 of an inch in lenirth. 



PIN-. .letl'reys. 1SU7. 



! S. MontMLMl. |M. 1-S. ti- ili. 



Thin, \\hite. -mitraii-paivni, -..mewhat ^Inssy, with numerous 

 tlexiioii-. longitudinal ril>. reticulated l>y many fine spiral rid ires or 

 stria-: whorU !' -in. moderately OOBVez, v TV -lowly increa>iiiL r , with 

 deej' ; i-th. :; mill. 



I'.' 

 \ QH M ii DB, .1- tlr.-w IM. 1>. li-. <i7. 



it, s4-initraii'|iarent, glossy, yellowi>h white: whorl - 



-l-.uly increaHii-. a little round >hnuldernl. with ahout 



