230 roBmn) 



with .H-conda- also some older fossils ofsomewhal 



problematical portion, which may perhaps belong in the family. 



[i HI Mri. ' 



Turhinate. thick, with moderate -pire and acute apex. L. i.n- 

 TOREA, Linn. 



UUPHB, MuhltM.lt. UJ 



Shell rather thin, conical, with pointed spire; surface with re- 

 volvin- -ciilpture, and usually variegated with brilliant colors, 

 'al and -ubtropical. L. 8CABKA, Linn. 



psis (Beck), Morch. 1876, is a synonym. 



Section Ni-:iMTnni.~. lii-own, 1827. 



Shell ,-hort, turbinate or subirlobose, s]>ire very short, with ob- 

 tuse apex : solid, inner lip much thickened and excavated. L. OB- 

 TU8ATA, Linn. 



Neritrema, Recluz, is a synonym. 



.n L\Mi:i.i.ii.riMi:iN \. Tryon. 

 Wh..rU CTOeeed by lamella-, like Scalaria. L. ALHICAN-. Met- 



ealfe. 



Section L.T.VII.IT..I:!\ \. Pf.-Mer, 1886. 



Chitinous. scarcely chalky, fragile, rimate; lip thin, .-harp, the 

 extremities united by a thin callus; epidermis smooth. 



L. i \ I I'.IXoSA, Old. Antnrrfic Sea. 



Section I'KU.IUTOKINA, Pfeffer, 1886. 



Thin, impertorate. brownisli. with rounded hairy whorls, colum- 

 ellar callus weak, peri-tome thin, acute. L. SI:T<>SA. Smith. 



Anturrf 



\i:i \. Dall.. 1 v 



PaltKlinit'orm. thin, metnbrauoiis. impertorate, smooth, under a 

 rough nhoggy epidermic ( )jterculum paucispiral, with a raised 

 1 rib on the inner >ide. 



Animal MM. l<>. : ,ueh like I.iftnriini. with entire 



soft and ^-latinoii-. \\itli a prfu>ion of tenacim? mucii-; 

 DO jaw; plyto|.ha.L r ou> : mantle-e<L r c plain, no opercular ajpen- 

 dages; oviparous. A. Tn:\i 1:1. Dall. 



Labrador, and Arctic Ocean, mirth of 11< rhi</\ Strait. 



