CL'MIXrnA.— Plate I. 



l:ii-l_y concr-ntrically Limiiuited, laiiiiii:i -tamling 



out, some broad. 

 Snwi:i;BV. Proc. Zool. So,:-., IS-:!. 

 ]lah. riiili > 



The must ineuulai-ly laminated of all the species, 

 ,111(1 tlie most triansrular in form. 



ventral margin contracted near the end ; dorsal 



margin sloped. 

 SowKRi'.Y. Proe. Zool., 18;!3. 

 Hab. Chili. 



nulo; l„t.n 



Species (1. (Miis. Hril.) 



CiTMiNGiA sniu.i-.. Cum. testa urato-mblrigonii, laevi- 

 gata, Ian, in,'.- /,<nic/y conc-titn'cis omald ; latere 

 antiai iuihilo, rutiindu ; latere postira ronti-ato, nd 

 Irrmiiuun lu.ii.jlinf r,;,lr<ili^ Kiihacmn: n<lt„. 



Tin: siMii.Ai: ('rMis.,iA. Sh.'ll uvate-sublricronal. 



lieakr 



couceutnc lamina; ; 

 I'd ; posterior side 

 it the end of the 



Species h. (Mus. Brit.) 



Cotir.Htrn-:- l.nitin.ltd. hiuiiuls „,l;/,i,f; 



l,nsti,0 ,n,ll,l/atn. „r„ 1,1,11, tin, .^„ln,.<ln 

 i;-i,lni!i iwi.pp l,-iii,''„iii,i ,;,i,tra,-t,' ; m,, 

 ,lc,-li,-i. 

 Till l.\mi:i.i,.m; ('umi.n<,i.v. Shell oblong. r.-g.iLal\ 

 eoiiceiitricallv laminated, lamina; narrow, standing 

 out, distant; anterior side short, rounded; pos- I Ditb-iing lV..ui th.- iireeeding species chielly in the 

 terior side angular, acuminated, .subrostrated ; I fewness and iiicgularit)- of the lamina?. 



\. .Vi.AMv Pi-..,.. Z.1..I. Sue., l.s.V 

 //<//.. X.W. Corist .if Am.'riea. 



