- 7:^ - 



anee , the Bowden and Santo iJoraiii<;:ian oocurrerjoea oeing the lirot 

 to he .encouj-itere'. 



The LuGiiiaeea ac c e have a more raofern aT)-oearan3.-. 



thazi xiov.lZ he er;";ecte:1 in the c.wo of an Up'^er Oli^'oce^-e lo.," 

 In addition to the inf3.uence of several GpeGies, including 



J dal-' i s.. lomonea , C!oda2:ia ( Jaronia ) vendrj'e 3i and i rl e s 



( Oalluoina ) pi;uperatus , v.h.ich are meet closely related to jJiiplin 

 or later forme, this aspect is emphasized bj? the initial appear- 

 ance of the '. ection Plour olucina of the .'^-enis Phaooides , a rroti'^ 

 '.?hieh in Florida i>j not known earlier -r:an i;he Pliocene. 5ne 

 section Snlopia of K' rtaea . al : introduced in the Oenpa 



fauna, reaches its fir"t develoornent of an;: i— oortance in the 



Sov.'den jTauna and is i'eaent in a;'i;^ oP the po:„t- Jaripa Plori- 



'Tertiarj? 

 da fan f as. Besides, no form reremblir^<T J'hacoides (Here) tithonic 



has been recop'nize'l exeeot in the Recent faruia leal Bell- 



n 



cinas of the tv-oe of P. (:3elln,cina) archontor;i.^ P: ve uog oeen 



reported from horizons lower than the Duplin. rhe sunerfamily 

 under discussion includes also - Recent Divaricella and. a He- 

 cent Diplodonta . the latter bei from anj intervenir^; 

 horizon. 



'T'he Oardixuns incliicle gr, ups :hat h-.ve reorerjentatives 

 in virtuallv all of the conti^.exitsl :i;io-c;ropi lal faiii.as that have 

 been atrdied, the groups beiii,^- typified by existing forms. 

 There are, however, '' 'O .occnt species, _0. ( ?rf.':aijn ) rne'^lujn and 

 2. ( ■^acvicar'-"'lum ) serratum that on the Perth ^lfaerics.n mainland 

 ore confine c c and later horizons. 0. ( Trach^.eardiurn ) 



