Smithsonian Miscellaneous Collections

Adapical ambulacral plates ammonium chloride apical system areolae avicu basicoronal Bighorn Basin Bridger Bryozoa Bryozoaires Buge and Galopim Canu and Bassler convex costules crest denticles directed proximally distal distal cover distal lip distal margin distal shelf distolateral dorsal Durhamella early Eocene echinoids elongate Eocene Figure Florida foramen Formation fossil Frontal view frontal wall Galopim de Carvalho genital pores genus Geol gonoecium helveticum holotype Hyopsodus Kempsville Kier lateral margins lower Lysite Mary Vaux Walcott material maxilla medial Meniscotherium Metrarabdotos micropora middle Eocene Milne Edwards Miocene miticulus molars moniliferum NUMBER OF SPECIMENS Oligocene ordinary avicularia paired paratypes paratypes USNM paulus peristome petals Pleistocene Pliocene pore-pairs posterior powellianus proximal lip ramus of mandible rostrum rows secondary orifice showing slightly special avicularia species specimen USNM subspecies surface sutures talonid tenue test well level transversely Trigonopora unguiculatum ventrally view of specimen Wasatchian Wind River Basin Wyoming zoarial fragments zooecia