Polyps and sclerites of Isidella tenuis, holotype, JSL-I-1929, USNM 89382, a lateral stereo view of two polyps b cross section of internode showing hollow core c stereo view of ridged ornamentation of body wall needles d upper body wall needles e enlargement of upper body wall needle f lower body wall needles g two coenenchymal scales h tentacular platelets i basal body wall needles j pharyngeal rodlets.