.ii i i in i .;_>:; 



.11 ITKKYSI \. Vhlci 

 ( 'haracters t Im-i- ,,t' ill. lamih . I >i 



.1 LI \IH \ v \ \ 

 letfreVMa I . fn.m \\hich > 



mucous thread. The eyei are \ i-ii>li- tin--. hell. 



Ar, < ir;.\ 1847 ii"! deei 



IMi \. 



Shell rloii-;il<' [.yrsmiiihil. ( )|nTciiIiiin 

 wil)iii;irLriiiMl cl:i\v. Animal \\itli truncat.> f'.iut and i 

 T. BUONENSIB, \VM,M|>. 



Slu-ll iv:itr. siilx-onical, sriMM.tli, iiM|)rrfor;itr. o!i\ 



oval, entire, rounded in front ; prrinvmr n<>t oontinui 

 iliin. Dperciilum like Jeffreysia. D. OLJVACEA, lint- 



FAMILI SKENEIL 



Head lar-v, proboscidiforDI, toot truncate in front. "|< 

 tolic without nppcinla^rs. tentacle- Imi-j-. <-ylinli i ai. 



B, at their external l;iM--l'I. ' \. ti-_ r . 1 "" , .Ia\\ - i ul> rciilatc. 

 Ha.lula like llvdrol.ia-*!'!...!. | 



Shell dejre>><'d. m-arly di.-coidal, trw-\vli.rl-d. \\ - Mli- 



-:it-l, aperture rounded, pel -i-ionu- c.intiiMit.ii-. OpetCtlltl] 

 ous. iniiltispiral. 



u 8KENEA, Kl.-ii.ii 



Charactei> tho-e .t' tin- family. 

 under st- .ties and on aL'.-' 1 . S. PLA9ORBIB, I'al>r. 

 l)('l/)h!nnitli-'i, IJroun. i- a -ynonyni. 



FAMILI CHORI8TI1 



Shell helicit'onn. thin, |.- 

 lure oval, jti-ri-toinc mill imioii-. -hai ; 

 spiral. 



i .-hort. lar_!. t\\i-liort ant iacle> ai- 



u frontal veil, the po.-i. , le. thick 



prolio-ci-. retractili fe, "val. with fcwo 



