Kier, Porter M. <br/><br/>
Erchinoids from the Triassic (St. Cassian) of Italy, their lantern supports and a revised phylogeny of Triassic echinoids / 
Porter M. Kier 
 - Washington :  Smithsonian Institution Press,  1984 
 - 41 p. ;  27 cm. 
 - Smithsonian contributions to paleobiology  no.56 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sea urchins, Fossil<br/>Paleontology--Triassic