- 9 - 



Domingian Spondyliis nresents a depauperate aspect. j 



'2he famil;. rirnidae iiialudeo, in addition to the con- 



raon 11 nia , the rare Tlmaea . Likev/i se amo .lomidae is 



fouii'^. the nricoramon rlacimaiiomia , as well as th^ -^'nir-i- 



American 

 ibiorrla . The genus Preissena is also infrequent l;y encouiitered ,-amang'^ -i 



Tertiary faimas, due probaTDl;,^ to its non-marine habitat. Of 



decideril^' frreater interest is the oresenof ^v r:he •^-■-■nreriielj/" rare 

 Julia , a genus which at the preDeii;.' time ia coiixiiied to the Pac- 

 ific region and is represented by only a few fossil species, 

 one having' been describe ri frovi the Ohipola mart ^--'Vi '-.^-lo from the 

 Aquitanian of France. 



The Anoiaalodesiiiacea, vTith five species, are confined 

 to the super family Poromy?^'^-;^ -rfi n-.-m •-.-■'p -.:'^i-^^ ''mall forms under 

 the families Verticordiidae, i.-orOiayacidae and Juspidariidae. 

 i^ecause of the unusiial dentition of one of the tv/o soecies of '^ 



Ouc'oic c.ria . "--ll 1.^^, _iropose''? ^ V'-'--' rvrnc'^-r-pv- -^ni- -; '- .ption. 



Taturally the Teleodesi.-acea inclur;e i^he bulic of ! 



the ff;u a, ;bxxt the expect 'iority of thiu niost hip-hly 



specialized order is somc..^^ ^; adujiibr'^'- '•'' by th -^^ :.-:-!r-i>,,-. r 



of orionodonts. Among the Astartacea members of ol.i ' ly j 



Astartidae are conspicuously , ;iile the ;lli- 



ti "oo pxe represented by fiv^^ ^-oies of . _: , ^'tell i ,, .. , : 



the most interesting and the uiojt a'; -t belong to the sao- \ 



?voij.us Oras cine 11a. I'o G: . , s 



