of the 'ReoQ.nt nangrove-o^ster, 2.- foliuri, in the '^ov/den faaijia is 

 Gomev/hat Gurprisincr. 



The Veoten^ Ir^oZ --^-;"-l elemen': re not 



knov^ii amovig the ^lori '. 'er Gligocene famiaa, iiuch as T, 



( Euvola ) ho-denencic , ^. ( Aer ujoe 3ten ) rjumpleua. and P. ( Pro p-- 

 eamuaium) s-3end^:l-.i:'; . "^'"^ -i- "i- membe':" ■'^~ '"' ^- ^-ennc, 



P. ( Aeqiii':;ecten ^ inaequalis var. cioutipictixE all he 



considei variety of the Piecent P. raayaguenc ' . -Ithoarh 



the section Pro pe anus lum ^'"' "'"-^'"n from the '< .oeene, the 



Bow den specie ' "- ' form foiuvl in the present 



V/est India: . \ition to ': - ., the 



Peotinacea Bupplj' another more modern element in the ioit.i of 

 Spond:;lua inoiVoiu:^ , ' h ma^^ be the iom\s of the Recent 

 echinatuG . Among the remaining Prionodesraacea the genera 

 11 :-,ea and ?lacr.^'a::oyua are luirepresent ed in ^ ^.^ -.ligocene 

 of the Jloridian uection. 



Almost all of the Anomalodesmaoea have modern aff- 

 inities, h^^t their tectinony can not h^ve '^'^--^h --^ -■'■''•■' t sin^e the 

 genera repi'ecented ar ' es th. 'e heen rather atahle for 



a Ion-- oeriod.. 



Of the five L;oecieK of Oraosatelliteg -' ^ '"-■'^ "-^ot ,^-io:_ 

 ir.g to the section Scaiahiila are verv cl: " relate^l 'oo Jhlpolan 

 forr.ic, "out the ^ren-inellas, es^-;er;' Z, xenns , are d- 



dern. A-itie f x j..i o.ie .;eeent Oha. .^; ■:ic.'.,:^.;roph2,'lla , '':•-' -T^ecence 

 of the genus HchinoeTiaiiia lends to the Ghamidae a modern appear- 



